pvData/pvDataApp/factory/Convert.cpp

/* Convert.cpp */
/**
 * Copyright - See the COPYRIGHT that is included with this distribution.
 * EPICS pvDataCPP is distributed subject to a Software License Agreement found
 * in file LICENSE that is included with this distribution.
 */
#include <cstdio>
#include <string>
#include <vector>
#include <stdexcept>
#include <typeinfo>
#include <pv/lock.h>
#include <pv/pvIntrospect.h>
#include <pv/pvData.h>
#include <pv/convert.h>

using std::tr1::static_pointer_cast;
using std::size_t;

namespace epics { namespace pvData { 

static PVDataCreatePtr pvDataCreate;

static String trueString("true");
static String falseString("false");
static String logicError("Logic error. Should never get here.");
static String illegalScalarType("Illegal ScalarType");

static ConvertPtr convert;

template<typename T>
T toScalar(PVScalarPtr const &pv)
{
    ScalarConstPtr scalar = pv->getScalar();
    ScalarType scalarType = scalar->getScalarType();
    switch(scalarType) {
        case pvBoolean:
           throw std::logic_error(String("boolean can not be converted to scalar"));
        case pvByte: {
            PVBytePtr value = static_pointer_cast<PVByte>(pv);
            return value->get();
        }
        case pvShort: {
            PVShortPtr value = static_pointer_cast<PVShort>(pv);
            return value->get();
        }
        case pvInt: {
            PVIntPtr value = static_pointer_cast<PVInt>(pv);
            return value->get();
        }
        case pvLong: {
            PVLongPtr value = static_pointer_cast<PVLong>(pv);
            return value->get();
        }
        case pvUByte: {
            PVUBytePtr value = static_pointer_cast<PVUByte>(pv);
            return value->get();
        }
        case pvUShort: {
            PVUShortPtr value = static_pointer_cast<PVUShort>(pv);
            return value->get();
        }
        case pvUInt: {
            PVUIntPtr value = static_pointer_cast<PVUInt>(pv);
            return value->get();
        }
        case pvULong: {
            PVULongPtr value = static_pointer_cast<PVULong>(pv);
            return value->get();
        }
        case pvFloat: {
            PVFloatPtr value = static_pointer_cast<PVFloat>(pv);
            return static_cast<T>(value->get());
        }
        case pvDouble: {
            PVDoublePtr value = static_pointer_cast<PVDouble>(pv);
            return static_cast<T>(value->get());
        }
        case pvString:
           throw std::logic_error(String("string can not be converted to byte"));
    }
    throw std::logic_error(logicError);
}

int8 Convert::toByte(PVScalarPtr const & pv)
{
     return toScalar<int8>(pv);
}

int16 Convert::toShort(PVScalarPtr const & pv)
{
     return toScalar<int16>(pv);
}

int32 Convert::toInt(PVScalarPtr const & pv)
{
     return toScalar<int32>(pv);
}

int64 Convert::toLong(PVScalarPtr const & pv)
{
     return toScalar<int64>(pv);
}

uint8 Convert::toUByte(PVScalarPtr const & pv)
{
     return toScalar<uint8>(pv);
}

uint16 Convert::toUShort(PVScalarPtr const & pv)
{
     return toScalar<uint16>(pv);
}

uint32 Convert::toUInt(PVScalarPtr const & pv)
{
     return toScalar<uint32>(pv);
}

uint64 Convert::toULong(PVScalarPtr const &pv)
{
     return toScalar<uint64>(pv);
}

float Convert::toFloat(PVScalarPtr const &pv)
{
     return toScalar<float>(pv);
}

double Convert::toDouble(PVScalarPtr const & pv)
{
     return toScalar<double>(pv);
}

template<typename T>
String scalarToString(T);

template<>
String scalarToString<int8>(int8 value)
{
    char buffer[20];
    int ival = value;
    sprintf(buffer,"%d",ival);
    return String(buffer);
}

template<>
String scalarToString<int16>(int16 value)
{
    char buffer[20];
    int ival = value;
    sprintf(buffer,"%d",ival);
    return String(buffer);
}

template<>
String scalarToString<int32>(int32 value)
{
    char buffer[20];
    int ival = value;
    sprintf(buffer,"%d",ival);
    return String(buffer);
}

template<>
String scalarToString<int64>(int64 value)
{
    char buffer[30];
    sprintf(buffer,"%lld",(long long)value);
    return String(buffer);
}

template<>
String scalarToString<uint8>(uint8 value)
{
    char buffer[20];
    unsigned int ival = value;
    sprintf(buffer,"%ud",ival);
    return String(buffer);
}

template<>
String scalarToString<uint16>(uint16 value)
{
    char buffer[20];
    unsigned int ival = value;
    sprintf(buffer,"%iud",ival);
    return String(buffer);
}

template<>
String scalarToString<uint32>(uint32 value)
{
    char buffer[20];
    sprintf(buffer,"%ud",value);
    return String(buffer);
}

template<>
String scalarToString<uint64>(uint64 value)
{
    char buffer[30];
    sprintf(buffer,"%llu",(unsigned long long)value);
    return String(buffer);
}

template<>
String scalarToString<float>(float value)
{
    char buffer[40];
    sprintf(buffer,"%g",value);
    return String(buffer);
}

template<>
String scalarToString<double>(double value)
{
    char buffer[40];
    sprintf(buffer,"%g",value);
    return String(buffer);
}

template<typename T>
void fromScalar(PVScalarPtr const &pv,T from)
{
    ScalarConstPtr scalar = pv->getScalar();
    ScalarType scalarType = scalar->getScalarType();
    switch(scalarType) {
        case pvBoolean:
           throw std::logic_error("byte can not be converted to boolean");
        case pvByte: {
            PVBytePtr value = static_pointer_cast<PVByte>(pv);
            value->put(from); return;
        }
        case pvShort: {
            PVShortPtr value = static_pointer_cast<PVShort>(pv);
            value->put(from); return;
        }
        case pvInt: {
            PVIntPtr value = static_pointer_cast<PVInt>(pv);
            value->put(from); return;
        }
        case pvLong: {
            PVLongPtr value = static_pointer_cast<PVLong>(pv);
            value->put(from); return;
        }
        case pvUByte: {
            PVUBytePtr value = static_pointer_cast<PVUByte>(pv);
            value->put(from); return;
        }
        case pvUShort: {
            PVUShortPtr value = static_pointer_cast<PVUShort>(pv);
            value->put(from); return;
        }
        case pvUInt: {
            PVUIntPtr value = static_pointer_cast<PVUInt>(pv);
            value->put(from); return;
        }
        case pvULong: {
            PVULongPtr value = static_pointer_cast<PVULong>(pv);
            value->put(from); return;
        }
        case pvFloat: {
            PVFloatPtr value = static_pointer_cast<PVFloat>(pv);
            value->put(from); return;
        }
        case pvDouble: {
            PVDoublePtr value = static_pointer_cast<PVDouble>(pv);
            value->put(from); return;
        }
        case pvString: {
            PVStringPtr pvvalue = static_pointer_cast<PVString>(pv);
            String value = scalarToString<T>(from);
            pvvalue->put(value);
            return;
        }
    }
    throw std::logic_error(logicError);
}

void Convert::fromByte(PVScalarPtr const &pv,int8 from)
{
     fromScalar<int8>(pv,from);
}

void  Convert::fromShort(PVScalarPtr const &pv,int16 from)
{
    fromScalar<int16>(pv,from);
}

void  Convert::fromInt(PVScalarPtr const &pv, int32 from)
{
    fromScalar<int32>(pv,from);
}

void  Convert::fromLong(PVScalarPtr const &pv, int64 from)
{
    fromScalar<int64>(pv,from);
}

void Convert::fromUByte(PVScalarPtr const &pv,uint8 from)
{
     fromScalar<uint8>(pv,from);
}

void  Convert::fromUShort(PVScalarPtr const &pv,uint16 from)
{
    fromScalar<uint16>(pv,from);
}

void  Convert::fromUInt(PVScalarPtr const &pv, uint32 from)
{
    fromScalar<uint32>(pv,from);
}

void  Convert::fromULong(PVScalarPtr const &pv, uint64 from)
{
    fromScalar<uint64>(pv,from);
}

void  Convert::fromFloat(PVScalarPtr const &pv, float from)
{
    fromScalar<float>(pv,from);
}

void  Convert::fromDouble(PVScalarPtr const &pv, double from)
{
    fromScalar<double>(pv,from);
}


static bool convertEquals(PVField *a,PVField *b);
static size_t convertFromByteArray(PVScalarArray * pv, size_t offset,
    size_t len,const int8 from[], size_t fromOffset);
static size_t convertToByteArray(PVScalarArray *pv, size_t offset,
    size_t len,int8 to[], size_t toOffset);
static size_t convertFromShortArray(PVScalarArray *pv, size_t offset,
    size_t len,const int16 from[], size_t fromOffset);
static size_t convertToShortArray(PVScalarArray *pv, size_t offset,
    size_t len,int16 to[], size_t toOffset);
static size_t convertFromIntArray(PVScalarArray *pv, size_t offset,
    size_t len,const int32 from[], size_t fromOffset);
static size_t convertToIntArray(PVScalarArray *pv, size_t offset,
    size_t len,int32 to[], size_t toOffset);
static size_t convertFromLongArray(PVScalarArray *pv, size_t offset,
    size_t len,const int64 from[], size_t fromOffset);
static size_t convertToLongArray(PVScalarArray * pv, size_t offset,
    size_t len,int64 to[], size_t toOffset);
static size_t convertFromUByteArray(PVScalarArray * pv, size_t offset,
    size_t len,const uint8 from[], size_t fromOffset);
static size_t convertToUByteArray(PVScalarArray *pv, size_t offset,
    size_t len,uint8 to[], size_t toOffset);
static size_t convertFromUShortArray(PVScalarArray *pv, size_t offset,
    size_t len,const uint16 from[], size_t fromOffset);
static size_t convertToUShortArray(PVScalarArray *pv, size_t offset,
    size_t len,uint16 to[], size_t toOffset);
static size_t convertFromUIntArray(PVScalarArray *pv, size_t offset,
    size_t len,const uint32 from[], size_t fromOffset);
static size_t convertToUIntArray(PVScalarArray *pv, size_t offset,
    size_t len,uint32 to[], size_t toOffset);
static size_t convertFromULongArray(PVScalarArray *pv, size_t offset,
    size_t len,const uint64 from[], size_t fromOffset);
static size_t convertToULongArray(PVScalarArray * pv, size_t offset,
    size_t len,uint64 to[], size_t toOffset);
static size_t convertFromFloatArray(PVScalarArray *pv, size_t offset,
    size_t len,const float from[], size_t fromOffset);
static size_t convertToFloatArray(PVScalarArray * pv, size_t offset,
    size_t len,float to[], size_t toOffset);
static size_t convertFromDoubleArray(PVScalarArray *pv, size_t offset,
    size_t len,const double from[], size_t fromOffset);
static size_t convertToDoubleArray(PVScalarArray *pv, size_t offset,
    size_t len,double to[], size_t toOffset);
static size_t convertFromStringArray(PVScalarArray *pv, size_t offset,
    size_t len,const StringArray & from, size_t fromOffset);
static size_t convertToStringArray(PVScalarArray *pv, size_t offset,
    size_t len,StringArray & to, size_t toOffset);

static void convertToString(StringBuilder buffer,
    PVField const  *pv,int indentLevel);
static void convertStructure(StringBuilder buffer,
    PVStructure const *data,int indentLevel);
static void convertArray(StringBuilder buffer,
    PVScalarArray  const* pv,int indentLevel);
static void convertStructureArray(StringBuilder buffer,
    PVStructureArray const * pvdata,int indentLevel);
static size_t copyArrayDataReference(PVScalarArray *from,PVArray *to);
static size_t copyNumericArray(PVScalarArray *from,
    size_t offset, PVScalarArray *to, size_t toOffset, size_t len);

static std::vector<String> split(String commaSeparatedList);

static std::vector<String> split(String commaSeparatedList) {
    String::size_type numValues = 1;
    String::size_type index=0;
    while(true) {
        String::size_type pos = commaSeparatedList.find(',',index);
        if(pos==String::npos) break;
        numValues++;
        index = pos +1;
    }
    std::vector<String> valueList(numValues,"");
    index=0;
    for(size_t i=0; i<numValues; i++) {
        size_t pos = commaSeparatedList.find(',',index);
        String value = commaSeparatedList.substr(index,pos);
        valueList[i] = value;
        index = pos +1;
    }
    return valueList;
}
    
Convert::Convert(){}

Convert::~Convert(){}

void Convert::getFullName(StringBuilder buf,PVFieldPtr const & pvField)
{
    buf->empty();
    *buf += pvField->getFieldName();
    PVStructure *parent;
    while((parent=pvField->getParent())!=0) {
         parent = pvField->getParent();
         String name = parent->getFieldName();
         if(name.length()>0) {
             buf->insert(0,".");
             buf->insert(0,name);
         }
    }
}

bool Convert::equals(PVFieldPtr const &a,PVFieldPtr const &b)
{
    return convertEquals(a.get(),b.get());
}

bool Convert::equals(PVField &a,PVField &b)
{
    return convertEquals(&a,&b);
}

void Convert::getString(StringBuilder buf,PVFieldPtr const & pvField,int indentLevel)
{
    convertToString(buf,pvField.get(),indentLevel);
}

void Convert::getString(StringBuilder buf,PVFieldPtr const & pvField)
{
    convertToString(buf,pvField.get(),0);
}

void Convert::getString(StringBuilder buf,PVField const *pvField,int indentLevel)
{
    convertToString(buf,pvField,indentLevel);
}

void Convert::getString(StringBuilder buf,PVField const *pvField)
{
    convertToString(buf,pvField,0);
}

size_t Convert::fromString(PVStructurePtr const &pvStructure, StringArray const & from, size_t fromStartIndex)
{
    size_t processed = 0;
    
    PVFieldPtrArray const & fieldsData = pvStructure->getPVFields();
    if (fieldsData.size() != 0) {
        size_t length = pvStructure->getStructure()->getNumberFields();
        for(size_t i=0; i<length; i++) {
            PVFieldPtr fieldField = fieldsData[i];

            Type type = fieldField->getField()->getType();
            if(type==structure) {
                PVStructurePtr pv = static_pointer_cast<PVStructure>(fieldField);
                size_t count = fromString(pv, from, fromStartIndex);
                processed += count;
                fromStartIndex += count;
            }
            else if(type==scalarArray) {
                PVScalarArrayPtr pv = static_pointer_cast<PVScalarArray>(fieldField);
                size_t count = fromString(pv, from.at(fromStartIndex));
                processed += count;
                fromStartIndex += count;
            }
            else if(type==scalar) {
                PVScalarPtr pv = static_pointer_cast<PVScalar>(fieldField);
                fromString(pv, from.at(fromStartIndex++));
                processed++;
            }
            else {
                // structureArray not supported
                String message("Convert::fromString unsupported fieldType ");
                TypeFunc::toString(&message,type);
                throw std::logic_error(message);
            }
        }
    }
    
    return processed;
}


void Convert::fromString(PVScalarPtr const &pvScalar, String from)
{
    ScalarConstPtr scalar = pvScalar->getScalar();
    ScalarType scalarType = scalar->getScalarType();
    switch(scalarType) {
        case pvBoolean: {
                PVBooleanPtr pv = static_pointer_cast<PVBoolean>(pvScalar);
                bool value = 
                  ((from.compare("true")==0) ? true : false);
                pv->put(value);
                return;
            }
        case pvByte : {
                PVBytePtr pv = static_pointer_cast<PVByte>(pvScalar);
                int ival;
                sscanf(from.c_str(),"%d",&ival);
                int8 value = ival;
                pv->put(value);
                return;
            }
        case pvShort : {
                PVShortPtr pv = static_pointer_cast<PVShort>(pvScalar);
                int ival;
                sscanf(from.c_str(),"%d",&ival);
                int16 value = ival;
                pv->put(value);
                return;
            }
        case pvInt : {
                PVIntPtr pv = static_pointer_cast<PVInt>(pvScalar);
                int ival;
                sscanf(from.c_str(),"%d",&ival);
                int32 value = ival;
                pv->put(value);
                return;
            }
        case pvLong : {
                PVLongPtr pv = static_pointer_cast<PVLong>(pvScalar);
                int64 ival;
                sscanf(from.c_str(),"%lld",(long long *)&ival);
                int64 value = ival;
                pv->put(value);
                return;
            }
        case pvUByte : {
                PVUBytePtr pv = static_pointer_cast<PVUByte>(pvScalar);
                unsigned int ival;
                sscanf(from.c_str(),"%u",&ival);
                uint8 value = ival;
                pv->put(value);
                return;
            }
        case pvUShort : {
                PVUShortPtr pv = static_pointer_cast<PVUShort>(pvScalar);
                unsigned int ival;
                sscanf(from.c_str(),"%u",&ival);
                uint16 value = ival;
                pv->put(value);
                return;
            }
        case pvUInt : {
                PVUIntPtr pv = static_pointer_cast<PVUInt>(pvScalar);
                unsigned int ival;
                sscanf(from.c_str(),"%u",&ival);
                uint32 value = ival;
                pv->put(value);
                return;
            }
        case pvULong : {
                PVULongPtr pv = static_pointer_cast<PVULong>(pvScalar);
                unsigned long long ival;
                sscanf(from.c_str(),"%llu",(long long unsigned int *)&ival);
                uint64 value = ival;
                pv->put(value);
                return;
            }
        case pvFloat : {
                PVFloatPtr pv = static_pointer_cast<PVFloat>(pvScalar);
                float value;
                sscanf(from.c_str(),"%f",&value);
                pv->put(value);
                return;
            }
        case pvDouble : {
                PVDoublePtr pv = static_pointer_cast<PVDouble>(pvScalar);
                double value;
                sscanf(from.c_str(),"%lf",&value);
                pv->put(value);
                return;
            }
        case pvString: {
                PVStringPtr value = static_pointer_cast<PVString>(pvScalar);
                value->put(from);
                return;
            }
    }
    String message("Convert::fromString unknown scalarType ");
    ScalarTypeFunc::toString(&message,scalarType);
    throw std::logic_error(message);
}

size_t Convert::fromString(PVScalarArrayPtr const &pv, String from)
{
   if(from[0]=='[' && from[from.length()]==']') {
        size_t offset = from.rfind(']');
        from = from.substr(1, offset);
    }
    std::vector<String> valueList = split(from);
    size_t length = valueList.size();
    StringArray valueArray = StringArray(length);
    for(size_t i=0; i<length; i++) {
        String value = valueList[i];
        valueArray[i] = value;
    }
    size_t num = fromStringArray(pv,0,length,valueArray,0);
    if(num<length) length = num;
    pv->setLength(length);
    return length;
}

size_t Convert::fromStringArray(PVScalarArrayPtr const &pv, size_t offset, size_t length,
    StringArray const & from, size_t fromOffset)
{
    return convertFromStringArray(pv.get(),offset,length,from,fromOffset);
}

size_t Convert::toStringArray(PVScalarArrayPtr const & pv, size_t offset, size_t length,
    StringArray  &to, size_t toOffset)
{
    return convertToStringArray(pv.get(),offset,length,to,toOffset);
}

bool Convert::isCopyCompatible(FieldConstPtr const &from, FieldConstPtr const &to)
{
    if(from->getType()!=to->getType()) return false;
    switch(from->getType()) {
    case scalar:
        {
             ScalarConstPtr xxx = static_pointer_cast<const Scalar>(from);
             ScalarConstPtr yyy = static_pointer_cast<const Scalar>(to);
             return isCopyScalarCompatible(xxx,yyy);
        }
    case scalarArray:
        {
             ScalarArrayConstPtr xxx = static_pointer_cast<const ScalarArray>(from);
             ScalarArrayConstPtr yyy = static_pointer_cast<const ScalarArray>(to);
             return isCopyScalarArrayCompatible(xxx,yyy);
        }
    case structure:
        {
             StructureConstPtr xxx = static_pointer_cast<const Structure>(from);
             StructureConstPtr yyy = static_pointer_cast<const Structure>(to);
             return isCopyStructureCompatible(xxx,yyy);
        }
    case structureArray:
        {
             StructureArrayConstPtr xxx = static_pointer_cast<const StructureArray>(from);
             StructureArrayConstPtr yyy = static_pointer_cast<const StructureArray>(to);
             return isCopyStructureArrayCompatible(xxx,yyy);
        }
    }
    String message("Convert::isCopyCompatible should never get here");
    throw std::logic_error(message);
}

void Convert::copy(PVFieldPtr const & from, PVFieldPtr const & to)
{
    switch(from->getField()->getType()) {
    case scalar: 
        {
             PVScalarPtr xxx = static_pointer_cast<PVScalar>(from);
             PVScalarPtr yyy = static_pointer_cast<PVScalar>(to);
             copyScalar(xxx,yyy);
             return;
        }
    case scalarArray:
        {
             PVScalarArrayPtr fromArray = static_pointer_cast<PVScalarArray>(from);
             PVScalarArrayPtr toArray = static_pointer_cast<PVScalarArray>(to);
             size_t length = copyScalarArray(fromArray,0,toArray,0,fromArray->getLength());
             if(toArray->getLength()!=length) toArray->setLength(length);
             return;
        }
    case structure:
        {
             PVStructurePtr xxx = static_pointer_cast<PVStructure>(from);
             PVStructurePtr yyy = static_pointer_cast<PVStructure>(to);
             copyStructure(xxx,yyy);
             return;
        }
    case structureArray: {
            PVStructureArrayPtr fromArray = static_pointer_cast<PVStructureArray>(from);
            PVStructureArrayPtr toArray = static_pointer_cast<PVStructureArray>(to);
            copyStructureArray(fromArray,toArray);
            return;
        }
    }
}

bool Convert::isCopyScalarCompatible(
     ScalarConstPtr const & fromField, ScalarConstPtr const & toField)
{
    ScalarType fromScalarType = fromField->getScalarType();
    ScalarType toScalarType = toField->getScalarType();
    if(fromScalarType==toScalarType) return true;
    if(ScalarTypeFunc::isNumeric(fromScalarType)
    && ScalarTypeFunc::isNumeric(toScalarType)) return true;
    if(fromScalarType==pvString) return true;
    if(toScalarType==pvString) return true;
    return false;
}

void Convert::copyScalar(PVScalarPtr const & from, PVScalarPtr const & to)
{
    if(to->isImmutable()) {
        if(from==to) return;
        String message("Convert.copyScalar destination is immutable");
        throw std::invalid_argument(message);
    }
    ScalarType fromType = from->getScalar()->getScalarType();
    ScalarType toType = to->getScalar()->getScalarType();
    switch(fromType) {
    case pvBoolean: {
            if(toType!=pvBoolean) {
                if(toType!=pvString) {
                    String message("Convert.copyScalar arguments are not compatible");
                    throw std::invalid_argument(message);
                }
            }
            PVBooleanPtr data = static_pointer_cast<PVBoolean>(from);
            if(toType==pvString) {
                PVStringPtr dataTo = static_pointer_cast<PVString>(to);
                String buf("");
                data->toString(&buf);
                dataTo->put(buf);
            } else {
                bool value = data->get();
                PVBooleanPtr dataTo = static_pointer_cast<PVBoolean>(to);
                dataTo->put(value);
            }
            return;
        }
    case pvByte : {
            PVBytePtr data = static_pointer_cast<PVByte>(from);
            int8 value = data->get();
            fromByte(to,value);
            return;
        }
    case pvShort : {
            PVShortPtr data = static_pointer_cast<PVShort>(from);
            int16 value = data->get();
            fromShort(to,value);
            return;
        } 
    case pvInt :{
            PVIntPtr data = static_pointer_cast<PVInt>(from);
            int32 value = data->get();
            fromInt(to,value);
            return;
        }    
    case pvLong : {
            PVLongPtr data = static_pointer_cast<PVLong>(from);
            int64 value = data->get();
            fromLong(to,value);
            return;
        }  
    case pvUByte : {
            PVUBytePtr data = static_pointer_cast<PVUByte>(from);
            uint8 value = data->get();
            fromUByte(to,value);
            return;
        }
    case pvUShort : {
            PVUShortPtr data = static_pointer_cast<PVUShort>(from);
            uint16 value = data->get();
            fromUShort(to,value);
            return;
        } 
    case pvUInt :{
            PVUIntPtr data = static_pointer_cast<PVUInt>(from);
            uint32 value = data->get();
            fromUInt(to,value);
            return;
        }    
    case pvULong : {
            PVULongPtr data = static_pointer_cast<PVULong>(from);
            uint64 value = data->get();
            fromULong(to,value);
            return;
        }  
    case pvFloat : {
            PVFloatPtr data = static_pointer_cast<PVFloat>(from);
            float value = data->get();
            fromFloat(to,value);
            return;
        }     
    case pvDouble : {
            PVDoublePtr data = static_pointer_cast<PVDouble>(from);
            double value = data->get();
            fromDouble(to,value);
            return;
        }  
    case pvString: {
            PVStringPtr data = static_pointer_cast<PVString>(from);
            String value = data->get();
            fromString(to,value);
            return;
        }
    }
    String message("Convert::copyScalar should never get here");
    throw std::logic_error(message);
}

bool Convert::isCopyScalarArrayCompatible(ScalarArrayConstPtr const &fromArray,
    ScalarArrayConstPtr const &toArray)
{
    ScalarType fromType = fromArray->getElementType();
    ScalarType toType = toArray->getElementType();
    if(fromType==toType) return true;
    if(ScalarTypeFunc::isNumeric(fromType)
    && ScalarTypeFunc::isNumeric(toType)) return true;
    if(toType==pvString) return true;
    if(fromType==pvString) return true;
    return false;
}

size_t Convert::copyScalarArray(PVScalarArrayPtr const & from, size_t offset,
    PVScalarArrayPtr const & to, size_t toOffset, size_t length)
{
    
    if(to->isImmutable()) {
        if(from==to) return from->getLength();
        String message("Convert.copyArray destination is immutable");
        throw std::invalid_argument(message);
    }
    ScalarType fromElementType = from->getScalarArray()->getElementType();
    ScalarType toElementType = to->getScalarArray()->getElementType();
    
    if(from->isImmutable() && (fromElementType==toElementType)) {
        if(offset==0 && toOffset==0 && length==from->getLength()) {
            return copyArrayDataReference(from.get(),to.get());
        }
    }
    
    size_t ncopy = 0;
    if(ScalarTypeFunc::isNumeric(fromElementType)
    && ScalarTypeFunc::isNumeric(toElementType)) {
        return copyNumericArray(from.get(),offset,to.get(),toOffset,length);
    } else if(toElementType==pvBoolean && fromElementType==pvBoolean) {
        PVBooleanArray *pvfrom = static_cast<PVBooleanArray*>(from.get());
        PVBooleanArray *pvto = static_cast<PVBooleanArray*>(to.get());
        while(length>0) {
            size_t num = 0;
            size_t fromOffset = 0;
            BooleanArrayData booleanArrayData;
            num = pvfrom->get(offset,length,booleanArrayData);
            boolean * data = pvfrom->get();
            fromOffset = booleanArrayData.offset;
            if(num<=0) return ncopy;
            while(num>0) {
                size_t n = pvto->put(toOffset,num,data,fromOffset);
                if(n<=0) return ncopy;
                length -= n; num -= n; ncopy+=n; offset += n; toOffset += n; 
            }
        }
        return ncopy;
    } else if(toElementType==pvString && fromElementType==pvString) {
        PVStringArray *pvfrom = static_cast<PVStringArray*>(from.get());
        PVStringArray *pvto = static_cast<PVStringArray*>(to.get());
        while(length>0) {
            size_t num = 0;
            String *data;
            size_t fromOffset = 0;
            StringArrayData stringArrayData;
            num = pvfrom->get(offset,length,stringArrayData);
            data = pvfrom->get();
            fromOffset = stringArrayData.offset;
            if(num<=0) return ncopy;
            while(num>0) {
                size_t n = pvto->put(toOffset,num,data,fromOffset);
                if(n<=0) return ncopy;
                length -= n; num -= n; ncopy+=n; offset += n; toOffset += n; 
            }
        }
        return ncopy;
    } else if(toElementType==pvString) {
        PVStringArray *pvto = static_cast<PVStringArray*>(to.get());
        ncopy = from->getLength();
        if(ncopy>length) ncopy = length;
        size_t num = ncopy;
        StringArray toData(1);
        while(num>0) {
            toStringArray(from,offset,1,toData,0);
            if(pvto->put(toOffset,1,&toData[0],0)<=0) break;
            num--; offset++; toOffset++;
        }
        return ncopy;
    } else if(fromElementType==pvString) {
        PVStringArray *pvfrom = static_cast<PVStringArray*>(from.get());
        while(length>0) {
            size_t num = 0;
            size_t fromOffset = 0;
            StringArrayData stringArrayData;
            num = pvfrom->get(offset,length,stringArrayData);
            StringArray const & data = stringArrayData.data;
            fromOffset = stringArrayData.offset;
            if(num<=0) return ncopy;
            while(num>0) {
                size_t n = fromStringArray(to,toOffset,num,data,fromOffset);
                if(n<=0) return ncopy;
                length -= n; num -= n; ncopy+=n; offset += n; toOffset += n; 
            }
        }
        return ncopy;
    }
    String message("Convert::copyScalarArray should not get here");
    throw std::logic_error(message);
}

bool Convert::isCopyStructureCompatible(
    StructureConstPtr const &fromStruct, StructureConstPtr const &toStruct)
{
    FieldConstPtrArray fromFields = fromStruct->getFields();
    FieldConstPtrArray toFields = toStruct->getFields();
    size_t length = fromStruct->getNumberFields();
    if(length!=toStruct->getNumberFields()) return false;
    for(size_t i=0; i<length; i++) {
        FieldConstPtr from = fromFields[i];
        FieldConstPtr to = toFields[i];
        Type fromType = from->getType();
        Type toType = to->getType();
        if(fromType!=toType) return false;
        switch(fromType) {
        case scalar:
            {
		ScalarConstPtr xxx = static_pointer_cast<const Scalar>(from);
                ScalarConstPtr yyy = static_pointer_cast<const Scalar>(to);
                if(!isCopyScalarCompatible(xxx,yyy)) return false;
            }
            break;
        case scalarArray:
            {
		ScalarArrayConstPtr xxx = static_pointer_cast<const ScalarArray>(from);
                ScalarArrayConstPtr yyy = static_pointer_cast<const ScalarArray>(to);
                if(!isCopyScalarArrayCompatible(xxx,yyy)) return false;
            }
            break;
        case structure:
            {
		StructureConstPtr xxx = static_pointer_cast<const Structure>(from);
                StructureConstPtr yyy = static_pointer_cast<const Structure>(to);
                if(!isCopyStructureCompatible(xxx,yyy)) return false;
            }
            break;
        case structureArray:
            {
		StructureArrayConstPtr xxx = static_pointer_cast<const StructureArray>(from);
                StructureArrayConstPtr yyy = static_pointer_cast<const StructureArray>(to);
                if(!isCopyStructureArrayCompatible(xxx,yyy)) return false;
            }
            break;
        }
    }
    return true;
}

void Convert::copyStructure(PVStructurePtr const & from, PVStructurePtr const & to)
{
    if(to->isImmutable()) {
        if(from==to) return;
        String message("Convert.copyStructure destination is immutable");
        throw std::invalid_argument(message);
    }
    if(from==to) return;
    PVFieldPtrArray const & fromDatas = from->getPVFields();
    PVFieldPtrArray const & toDatas = to->getPVFields();
    if(from->getStructure()->getNumberFields() 
    != to->getStructure()->getNumberFields()) {
        String message("Convert.copyStructure Illegal copyStructure");
        throw std::invalid_argument(message);
    }
    size_t numberFields = from->getStructure()->getNumberFields();
    if(numberFields>=2) {
        String name0 = fromDatas[0]->getFieldName();
        String name1 = fromDatas[1]->getFieldName();
        // look for enumerated structure and copy choices first
        if(name0.compare("index")==0 && name1.compare("choices")==0) {
            FieldConstPtr fieldIndex = fromDatas[0]->getField();
            FieldConstPtr fieldChoices = fromDatas[1]->getField();
            if(fieldIndex->getType()==scalar
            && fieldChoices->getType()==scalarArray) {
                PVScalarPtr pvScalar = static_pointer_cast<PVScalar>(fromDatas[0]);
                PVScalarArrayPtr pvArray =
                    static_pointer_cast<PVScalarArray>(fromDatas[1]);
                if((pvScalar->getScalar()->getScalarType()==pvInt)
                && (pvArray->getScalarArray()->getElementType()==pvString)) {
                   PVScalarArrayPtr toArray = 
                       static_pointer_cast<PVScalarArray>(toDatas[1]);
                   copyScalarArray(pvArray,0,toArray,0,pvArray->getLength());
                   PVScalarPtr toScalar = static_pointer_cast<PVScalar>(toDatas[0]);
                   copyScalar(pvScalar,toScalar);
                   return;
                }
            }
        }
    }
    for(size_t i=0; i < numberFields; i++) {
        PVFieldPtr fromData = fromDatas[i];
        PVFieldPtr toData = toDatas[i];
        Type fromType = fromData->getField()->getType();
        Type toType = toData->getField()->getType();
        if(fromType!=toType) {
            String message("Convert.copyStructure Illegal copyStructure");
            throw std::invalid_argument(message);
        }
        switch(fromType) {
        case scalar:
            {
                PVScalarPtr xxx = static_pointer_cast<PVScalar>(fromData);
                PVScalarPtr yyy = static_pointer_cast<PVScalar>(toData);
                copyScalar(xxx,yyy);
                break;
            }
        case scalarArray:
            {
                PVScalarArrayPtr fromArray = static_pointer_cast<PVScalarArray>(fromData);
                PVScalarArrayPtr toArray = static_pointer_cast<PVScalarArray>(toData);
                size_t length = copyScalarArray(
                    fromArray,0,toArray,0,fromArray->getLength());
                if(toArray->getLength()!=length) toArray->setLength(length);
                break;
            }
        case structure:
            {
                PVStructurePtr xxx = static_pointer_cast<PVStructure>(fromData);
                PVStructurePtr yyy = static_pointer_cast<PVStructure>(toData);
                copyStructure(xxx,yyy);
                break;
            }
        case structureArray:
            {
                PVStructureArrayPtr fromArray = 
                    static_pointer_cast<PVStructureArray>(fromData);
                PVStructureArrayPtr toArray = 
                    static_pointer_cast<PVStructureArray>(toData);
                copyStructureArray(fromArray,toArray);
                break;
            }
        }
    }
}

bool Convert::isCopyStructureArrayCompatible(
    StructureArrayConstPtr const &from, StructureArrayConstPtr const &to)
{
    StructureConstPtr xxx = from->getStructure();
    StructureConstPtr yyy = to->getStructure();
    return isCopyStructureCompatible(xxx,yyy);
}

void Convert::copyStructureArray(
    PVStructureArrayPtr const & from, PVStructureArrayPtr const & to)
{
    if(to->isImmutable()) {
        if(from==to) return;
        String message("Convert.copyStructureArray destination is immutable");
        throw std::invalid_argument(message);
    }
    to->put(0,from->getLength(),from->getVector(),0);
}

String Convert::toString(PVScalarPtr const & pv)
{
    static String trueString("true");
    static String falseString("false");

    ScalarConstPtr scalar = pv->getScalar();
    ScalarType scalarType = scalar->getScalarType();
    switch(scalarType) {
        case pvBoolean: {
            PVBooleanPtr pvalue = static_pointer_cast<PVBoolean>(pv);
            boolean value = pvalue->get();
            return value ? trueString : falseString;
        }
        case pvByte: {
            PVBytePtr value = static_pointer_cast<PVByte>(pv);
            char buffer[30];
            sprintf(buffer,"%d",(int32)value->get());
            return String(buffer);
        }
        case pvShort: {
            PVShortPtr value = static_pointer_cast<PVShort>(pv);
            char buffer[30];
            sprintf(buffer,"%d",(int32)value->get());
            return String(buffer);
        }
        case pvInt: {
            PVIntPtr value = static_pointer_cast<PVInt>(pv);
            char buffer[30];
            sprintf(buffer,"%d",(int32)value->get());
            return String(buffer);
        }
        case pvLong: {
            PVLongPtr value = static_pointer_cast<PVLong>(pv);
            char buffer[30];
            sprintf(buffer,"%lli",(long long int)value->get());
            return String(buffer);
        }
        case pvUByte: {
            PVUBytePtr value = static_pointer_cast<PVUByte>(pv);
            char buffer[30];
            sprintf(buffer,"%u",(uint32)value->get());
            return String(buffer);
        }
        case pvUShort: {
            PVUShortPtr value = static_pointer_cast<PVUShort>(pv);
            char buffer[30];
            sprintf(buffer,"%u",(uint32)value->get());
            return String(buffer);
        }
        case pvUInt: {
            PVUIntPtr value = static_pointer_cast<PVUInt>(pv);
            char buffer[30];
            sprintf(buffer,"%u",value->get());
            return String(buffer);
        }
        case pvULong: {
            PVULongPtr value = static_pointer_cast<PVULong>(pv);
            char buffer[30];
            sprintf(buffer,"%llu",(unsigned long long int)value->get());
            return String(buffer);
        }
        case pvFloat: {
            PVFloatPtr value = static_pointer_cast<PVFloat>(pv);
            char buffer[30];
            sprintf(buffer,"%g",value->get());
            return String(buffer);
        }
        case pvDouble: {
            PVDoublePtr value = static_pointer_cast<PVDouble>(pv);
            char buffer[30];
            sprintf(buffer,"%lg",value->get());
            return String(buffer);
        }
        case pvString: {
            PVStringPtr value = static_pointer_cast<PVString>(pv);
            return value->get();
        }
    }
    throw std::logic_error(logicError);
}

size_t Convert::toByteArray(PVScalarArrayPtr const &pv, size_t offset, size_t length,
    int8 to[], size_t toOffset)
{
    return convertToByteArray(pv.get(), offset, length, to, toOffset);
}

size_t Convert::toShortArray(PVScalarArrayPtr const &pv, size_t offset, size_t length,
    int16 to[], size_t toOffset)
{
    return convertToShortArray(pv.get(), offset, length, to, toOffset);
}

size_t Convert::toIntArray(PVScalarArrayPtr const &pv, size_t offset, size_t length,
    int32 to[], size_t toOffset)
{
    return convertToIntArray(pv.get(), offset, length, to, toOffset);
}

size_t Convert::toLongArray(PVScalarArrayPtr const &pv, size_t offset, size_t length,
    int64 to[], size_t toOffset)
{
    return convertToLongArray(pv.get(), offset, length, to, toOffset);
}

size_t Convert::toUByteArray(PVScalarArrayPtr const &pv, size_t offset, size_t length,
    uint8 to[], size_t toOffset)
{
    return convertToUByteArray(pv.get(), offset, length, to, toOffset);
}

size_t Convert::toUShortArray(PVScalarArrayPtr const &pv, size_t offset, size_t length,
    uint16 to[], size_t toOffset)
{
    return convertToUShortArray(pv.get(), offset, length, to, toOffset);
}

size_t Convert::toUIntArray(PVScalarArrayPtr const &pv, size_t offset, size_t length,
    uint32 to[], size_t toOffset)
{
    return convertToUIntArray(pv.get(), offset, length, to, toOffset);
}

size_t Convert::toULongArray(PVScalarArrayPtr const &pv, size_t offset, size_t length,
    uint64 to[], size_t toOffset)
{
    return convertToULongArray(pv.get(), offset, length, to, toOffset);
}

size_t Convert::toFloatArray(PVScalarArrayPtr const &pv, size_t offset, size_t length,
    float to[], size_t toOffset)
{
    return convertToFloatArray(pv.get(), offset, length, to, toOffset);
}

size_t Convert::toDoubleArray(PVScalarArrayPtr const &pv, size_t offset, size_t length,
    double to[], size_t toOffset)
{
    return convertToDoubleArray(pv.get(), offset, length, to, toOffset);
}

size_t Convert::fromByteArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const int8 from[], size_t fromOffset)
{
    return convertFromByteArray(pv.get(), offset, length, from, fromOffset);
}

size_t Convert::fromByteArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const ByteArray & from, size_t fromOffset)
{
    return convertFromByteArray(pv.get(), offset, length, get(from), fromOffset);
}

size_t Convert::fromShortArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const int16 from[], size_t fromOffset)
{
    return convertFromShortArray(pv.get(), offset, length, from, fromOffset);
}

size_t Convert::fromShortArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const ShortArray & from, size_t fromOffset)
{
    return convertFromShortArray(pv.get(), offset, length, get(from), fromOffset);
}

size_t Convert::fromIntArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const int32 from[], size_t fromOffset)
{
    return convertFromIntArray(pv.get(), offset, length, from, fromOffset);
}

size_t Convert::fromIntArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const IntArray & from, size_t fromOffset)
{
    return convertFromIntArray(pv.get(), offset, length, get(from), fromOffset);
}

size_t Convert::fromLongArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const int64 from[], size_t fromOffset)
{
    return convertFromLongArray(pv.get(), offset, length, from, fromOffset);
}

size_t Convert::fromLongArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const LongArray & from, size_t fromOffset)
{
    return convertFromLongArray(pv.get(), offset, length, get(from), fromOffset);
}

size_t Convert::fromUByteArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const uint8 from[], size_t fromOffset)
{
    return convertFromUByteArray(pv.get(), offset, length, from, fromOffset);
}

size_t Convert::fromUByteArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const UByteArray & from, size_t fromOffset)
{
    return convertFromUByteArray(pv.get(), offset, length, get(from), fromOffset);
}

size_t Convert::fromUShortArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const uint16 from[], size_t fromOffset)
{
    return convertFromUShortArray(pv.get(), offset, length, from, fromOffset);
}

size_t Convert::fromUShortArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const UShortArray &from, size_t fromOffset)
{
    return convertFromUShortArray(pv.get(), offset, length, get(from), fromOffset);
}

size_t Convert::fromUIntArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const uint32 from[], size_t fromOffset)
{
    return convertFromUIntArray(pv.get(), offset, length, from, fromOffset);
}

size_t Convert::fromUIntArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const UIntArray & from, size_t fromOffset)
{
    return convertFromUIntArray(pv.get(), offset, length, get(from), fromOffset);
}

size_t Convert::fromULongArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const uint64 from[], size_t fromOffset)
{
    return convertFromULongArray(pv.get(), offset, length, from, fromOffset);
}

size_t Convert::fromULongArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const ULongArray &from, size_t fromOffset)
{
    return convertFromULongArray(pv.get(), offset, length, get(from), fromOffset);
}

size_t Convert::fromFloatArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const float from[], size_t fromOffset)
{
    return convertFromFloatArray(pv.get(), offset, length, from, fromOffset);
}

size_t Convert::fromFloatArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const FloatArray & from, size_t fromOffset)
{
    return convertFromFloatArray(pv.get(), offset, length, get(from), fromOffset);
}

size_t Convert::fromDoubleArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const double from[], size_t fromOffset)
{
    return convertFromDoubleArray(pv.get(), offset, length, from, fromOffset);
}

size_t Convert::fromDoubleArray(PVScalarArrayPtr &pv, size_t offset, size_t length,
    const DoubleArray & from, size_t fromOffset)
{
    return convertFromDoubleArray(pv.get(), offset, length, get(from), fromOffset);
}

void Convert::newLine(StringBuilder buffer, int indentLevel)
{
    *buffer += "\n";
    for(int i=0; i<indentLevel; i++) *buffer += "    ";
}

static bool scalarEquals(PVScalar *a,PVScalar *b)
{
    ScalarType ascalarType = a->getScalar()->getScalarType();
    ScalarType bscalarType = b->getScalar()->getScalarType();
    if(ascalarType!=bscalarType) return false;
    switch(ascalarType) {
        case pvBoolean: {
            PVBoolean *pa = static_cast<PVBoolean *>(a);
            PVBoolean *pb = static_cast<PVBoolean *>(b);
            bool avalue = pa->get();
            bool bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
        case pvByte: {
            PVByte *pa = static_cast<PVByte *>(a);
            PVByte *pb = static_cast<PVByte *>(b);
            int8 avalue = pa->get();
            int8 bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
        case pvShort: {
            PVShort *pa = static_cast<PVShort *>(a);
            PVShort *pb = static_cast<PVShort *>(b);
            int16 avalue = pa->get();
            int16 bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
        case pvInt: {
            PVInt *pa = static_cast<PVInt *>(a);
            PVInt *pb = static_cast<PVInt *>(b);
            int32 avalue = pa->get();
            int32 bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
        case pvLong: {
            PVLong *pa = static_cast<PVLong *>(a);
            PVLong *pb = static_cast<PVLong *>(b);
            int64 avalue = pa->get();
            int64 bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
        case pvUByte: {
            PVUByte *pa = static_cast<PVUByte *>(a);
            PVUByte *pb = static_cast<PVUByte *>(b);
            uint8 avalue = pa->get();
            uint8 bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
        case pvUShort: {
            PVUShort *pa = static_cast<PVUShort *>(a);
            PVUShort *pb = static_cast<PVUShort *>(b);
            uint16 avalue = pa->get();
            uint16 bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
        case pvUInt: {
            PVUInt *pa = static_cast<PVUInt *>(a);
            PVUInt *pb = static_cast<PVUInt *>(b);
            uint32 avalue = pa->get();
            uint32 bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
        case pvULong: {
            PVULong *pa = static_cast<PVULong *>(a);
            PVULong *pb = static_cast<PVULong *>(b);
            uint64 avalue = pa->get();
            uint64 bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
        case pvFloat: {
            PVFloat *pa = static_cast<PVFloat *>(a);
            PVFloat *pb = static_cast<PVFloat *>(b);
            float avalue = pa->get();
            float bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
        case pvDouble: {
            PVDouble *pa = static_cast<PVDouble *>(a);
            PVDouble *pb = static_cast<PVDouble *>(b);
            double avalue = pa->get();
            double bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
        case pvString: {
            PVString *pa = static_cast<PVString *>(a);
            PVString *pb = static_cast<PVString *>(b);
            String avalue = pa->get();
            String bvalue = pb->get();
            return ((avalue==bvalue) ? true : false);
        }
    }
    String message("should not get here");
    throw std::logic_error(message);
}

static bool arrayEquals(PVScalarArray *a,PVScalarArray *b)
{
    if(a==b) return true;
    ScalarType aType = a->getScalarArray()->getElementType();
    ScalarType bType = b->getScalarArray()->getElementType();
    if(aType!=bType) return false;
    if(a->getLength()!=b->getLength()) return false;
    size_t length = a->getLength();
    switch(aType) {
        case pvBoolean: {
            PVBooleanArray *aarray = static_cast<PVBooleanArray *>(a);
            PVBooleanArray *barray = static_cast<PVBooleanArray *>(b);
            BooleanArrayData adata;
            BooleanArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            BooleanArray avalue = adata.data;
            BooleanArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
        case pvByte: {
            PVByteArray *aarray = static_cast<PVByteArray *>(a);
            PVByteArray *barray = static_cast<PVByteArray *>(b);
            ByteArrayData adata;
            ByteArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            ByteArray avalue = adata.data;
            ByteArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
        case pvShort: {
            PVShortArray *aarray = static_cast<PVShortArray *>(a);
            PVShortArray *barray = static_cast<PVShortArray *>(b);
            ShortArrayData adata;
            ShortArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            ShortArray avalue = adata.data;
            ShortArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
        case pvInt: {
            PVIntArray *aarray = static_cast<PVIntArray *>(a);
            PVIntArray *barray = static_cast<PVIntArray *>(b);
            IntArrayData adata;
            IntArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            IntArray avalue = adata.data;
            IntArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
        case pvLong: {
            PVLongArray *aarray = static_cast<PVLongArray *>(a);
            PVLongArray *barray = static_cast<PVLongArray *>(b);
            LongArrayData adata;
            LongArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            LongArray avalue = adata.data;
            LongArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
        case pvUByte: {
            PVUByteArray *aarray = static_cast<PVUByteArray *>(a);
            PVUByteArray *barray = static_cast<PVUByteArray *>(b);
            UByteArrayData adata;
            UByteArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            UByteArray avalue = adata.data;
            UByteArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
        case pvUShort: {
            PVUShortArray *aarray = static_cast<PVUShortArray *>(a);
            PVUShortArray *barray = static_cast<PVUShortArray *>(b);
            UShortArrayData adata;
            UShortArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            UShortArray avalue = adata.data;
            UShortArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
        case pvUInt: {
            PVUIntArray *aarray = static_cast<PVUIntArray *>(a);
            PVUIntArray *barray = static_cast<PVUIntArray *>(b);
            UIntArrayData adata;
            UIntArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            UIntArray avalue = adata.data;
            UIntArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
        case pvULong: {
            PVULongArray *aarray = static_cast<PVULongArray *>(a);
            PVULongArray *barray = static_cast<PVULongArray *>(b);
            ULongArrayData adata;
            ULongArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            ULongArray avalue = adata.data;
            ULongArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
        case pvFloat: {
            PVFloatArray *aarray = static_cast<PVFloatArray *>(a);
            PVFloatArray *barray = static_cast<PVFloatArray *>(b);
            FloatArrayData adata;
            FloatArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            FloatArray avalue = adata.data;
            FloatArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
        case pvDouble: {
            PVDoubleArray *aarray = static_cast<PVDoubleArray *>(a);
            PVDoubleArray *barray = static_cast<PVDoubleArray *>(b);
            DoubleArrayData adata;
            DoubleArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            DoubleArray avalue = adata.data;
            DoubleArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
        case pvString: {
            PVStringArray *aarray = static_cast<PVStringArray *>(a);
            PVStringArray *barray = static_cast<PVStringArray *>(b);
            StringArrayData adata;
            StringArrayData bdata;
            aarray->get(0,length,adata);
            barray->get(0,length,bdata);
            StringArray avalue = adata.data;
            StringArray bvalue = bdata.data;
            for(size_t i=0; i<length; i++) {
                if(avalue[i]!=bvalue[i]) return false;
            }
            return true;
        }
    }
    String message("should not get here");
    throw std::logic_error(message);
}

static bool structureArrayEquals(PVStructureArray *a,PVStructureArray *b)
{
    StructureConstPtr aStructure = a->getStructureArray()->getStructure();
    StructureConstPtr bStructure = b->getStructureArray()->getStructure();
    if(aStructure!=bStructure) return false;
    if(a->getLength()!=b->getLength()) return false;
    StructureArrayData aData = StructureArrayData();
    StructureArrayData bData = StructureArrayData();
    size_t length = a->getLength();
    PVStructurePtrArray aArray = aData.data;
    PVStructurePtrArray bArray = bData.data;
    if(aArray==bArray) return true;
    for(size_t i=0; i<length; i++) {
        if(aArray[i]==0) {
            if(bArray[i]==0) continue;
            return false;
        } else {
            if(bArray[i]==0) return false;
        }
        if(*aArray[i]!=*bArray[i]) return false;
    }
    return true;
}

static bool structureEquals(PVStructure *a,PVStructure *b)
{
    StructureConstPtr aStructure = a->getStructure();
    StructureConstPtr bStructure = a->getStructure();
    size_t length = aStructure->getNumberFields();
    if(length!=bStructure->getNumberFields()) return false;
    PVFieldPtrArray const & aFields = a->getPVFields();
    PVFieldPtrArray const & bFields = b->getPVFields();
    for(size_t i=0; i<length; i++) {
        if(*aFields[i]!=*bFields[i]) return false;
    }
    return true;
}

bool convertEquals(PVField *a,PVField *b)
{
    void * avoid = static_cast<void *>(a);
    void * bvoid = static_cast<void *>(b);
    if(avoid==bvoid) return true;
    Type atype = a->getField()->getType();
    Type btype = b->getField()->getType();
    if(atype!=btype) return false;
    if(atype==scalar) return scalarEquals(
        static_cast<PVScalar *>(a),static_cast<PVScalar *>(b));
    if(atype==scalarArray) return arrayEquals(
        static_cast<PVScalarArray*>(a),static_cast<PVScalarArray *>(b));
    if(atype==structureArray) return structureArrayEquals(
        static_cast<PVStructureArray *>(a),static_cast<PVStructureArray *>(b));
    if(atype==structure) return structureEquals(
        static_cast<PVStructure *>(a),static_cast<PVStructure *>(b));
    String message("should not get here");
    throw std::logic_error(message);
}

template<typename PVT,typename T>
size_t convertFromScalarArray(PVScalarArray *pv,
    size_t offset, size_t len,const T from[], size_t fromOffset)
{
    ScalarType elemType = pv->getScalarArray()->getElementType();
    size_t ntransfered = 0;
    String xx = typeid(PVT).name();
    String yy = typeid(T).name();
    if(xx.compare(yy)== 0) {
        PVT *pvdata = static_cast<PVT*>(pv);
        while (len > 0) {
            size_t n = pvdata->put(offset, len, from, fromOffset);
            if (n == 0)
                break;
            len -= n;
            offset += n;
            fromOffset += n;
            ntransfered += n;
        }
        return ntransfered;
    }
    switch (elemType) {
    case pvBoolean: {
         String message("convert from numeric array to BooleanArray not legal");
         throw std::invalid_argument(message);
    }
    case pvByte: {
        PVByteArray *pvdata = static_cast<PVByteArray*>(pv);
        int8 data[1];
        while (len > 0) {
            data[0] = from[fromOffset];
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvShort: {
        PVShortArray *pvdata = static_cast<PVShortArray*>(pv);
        int16 data[1];
        while (len > 0) {
            data[0] = from[fromOffset];
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvInt: {
        PVIntArray *pvdata = static_cast<PVIntArray*>(pv);
        int32 data[1];
        while (len > 0) {
            data[0] = from[fromOffset];
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvLong: {
        PVLongArray *pvdata = static_cast<PVLongArray*>(pv);
        int64 data[1];
        while (len > 0) {
            data[0] = from[fromOffset];
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvUByte: {
        PVUByteArray *pvdata = static_cast<PVUByteArray*>(pv);
        uint8 data[1];
        while (len > 0) {
            data[0] = from[fromOffset];
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvUShort: {
        PVUShortArray *pvdata = static_cast<PVUShortArray*>(pv);
        uint16 data[1];
        while (len > 0) {
            data[0] = from[fromOffset];
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvUInt: {
        PVUIntArray *pvdata = static_cast<PVUIntArray*>(pv);
        uint32 data[1];
        while (len > 0) {
            data[0] = from[fromOffset];
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvULong: {
        PVULongArray *pvdata = static_cast<PVULongArray*>(pv);
        uint64 data[1];
        while (len > 0) {
            data[0] = from[fromOffset];
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvFloat: {
        PVFloatArray *pvdata = static_cast<PVFloatArray*>(pv);
        float data[1];
        while (len > 0) {
            data[0] =  from[fromOffset];
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvDouble: {
        PVDoubleArray *pvdata = static_cast<PVDoubleArray*>(pv);
        double data[1];
        while (len > 0) {
            data[0] =  from[fromOffset];
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvString: {
         String message("convert from byte[] to StringArray not legal");
         throw std::invalid_argument(message);
    }
    }
    String message("Convert::convertFromByteArray should never get here");
    throw std::logic_error(message);
}

template<typename T>
size_t convertToScalarArray(PVScalarArray *pv,
    size_t offset, size_t len,T to[], size_t toOffset)
{
    ScalarType elemType = pv->getScalarArray()->getElementType();
    size_t ntransfered = 0;
    switch (elemType) {
    case pvBoolean: {
        String message("convert BooleanArray to byte[]] not legal");
        throw std::invalid_argument(message);
    }
    case pvByte: {
        PVByteArray *pvdata = static_cast<PVByteArray*>(pv);
        ByteArrayData data;
        while (len > 0) {
            size_t num = 0;
            num = pvdata->get(offset,len,data);
            if (num <= 0) break;
            ByteArray dataArray = data.data;
            size_t dataOffset = data.offset;
            for(size_t i=0;i<num;i++) to[toOffset+i] = dataArray[dataOffset+1];
            len -= num;
            offset += num;
            toOffset += num;
            ntransfered += num;
        }
        return ntransfered;
    }
    case pvShort: {
        PVShortArray *pvdata = static_cast<PVShortArray*>(pv);
        ShortArrayData data;
        while (len > 0) {
            size_t num = pvdata->get(offset, len, data);
            if (num == 0) break;
            ShortArray dataArray = data.data;
            size_t dataOffset = data.offset;
            for (size_t i = 0; i < num; i++)
                to[i + toOffset] =  dataArray[i + dataOffset];
            len -= num;
            offset += num;
            toOffset += num;
            ntransfered += num;
        }
        return ntransfered;
    }
    case pvInt: {
        PVIntArray *pvdata = static_cast<PVIntArray*>(pv);
        IntArrayData data;
        while (len > 0) {
            size_t num = pvdata->get(offset, len, data);
            if (num == 0) break;
            IntArray dataArray = data.data;
            size_t dataOffset = data.offset;
            for (size_t i = 0; i < num; i++)
                to[i + toOffset] =  dataArray[i + dataOffset];
            len -= num;
            offset += num;
            toOffset += num;
            ntransfered += num;
        }
        return ntransfered;
    }
    case pvLong: {
        PVLongArray *pvdata = static_cast<PVLongArray*>(pv);
        LongArrayData data;
        while (len > 0) {
            size_t num = pvdata->get(offset, len, data);
            if (num == 0)
                break;
            LongArray dataArray = data.data;
            size_t dataOffset = data.offset;
            for (size_t i = 0; i < num; i++)
                to[i + toOffset] = dataArray[i + dataOffset];
            len -= num;
            offset += num;
            toOffset += num;
            ntransfered += num;
        }
        return ntransfered;
    }
    case pvUByte: {
        PVUByteArray *pvdata = static_cast<PVUByteArray*>(pv);
        UByteArrayData data;
        while (len > 0) {
            size_t num = 0;
            num = pvdata->get(offset,len,data);
            if (num <= 0) break;
            UByteArray dataArray = data.data;
            size_t dataOffset = data.offset;
            for(size_t i=0;i<num;i++) to[toOffset+i] = dataArray[dataOffset+1];
            len -= num;
            offset += num;
            toOffset += num;
            ntransfered += num;
        }
        return ntransfered;
    }
    case pvUShort: {
        PVUShortArray *pvdata = static_cast<PVUShortArray*>(pv);
        UShortArrayData data;
        while (len > 0) {
            size_t num = pvdata->get(offset, len, data);
            if (num == 0) break;
            UShortArray dataArray = data.data;
            size_t dataOffset = data.offset;
            for (size_t i = 0; i < num; i++)
                to[i + toOffset] =  dataArray[i + dataOffset];
            len -= num;
            offset += num;
            toOffset += num;
            ntransfered += num;
        }
        return ntransfered;
    }
    case pvUInt: {
        PVUIntArray *pvdata = static_cast<PVUIntArray*>(pv);
        UIntArrayData data;
        while (len > 0) {
            size_t num = pvdata->get(offset, len, data);
            if (num == 0) break;
            UIntArray dataArray = data.data;
            size_t dataOffset = data.offset;
            for (size_t i = 0; i < num; i++)
                to[i + toOffset] =  dataArray[i + dataOffset];
            len -= num;
            offset += num;
            toOffset += num;
            ntransfered += num;
        }
        return ntransfered;
    }
    case pvULong: {
        PVULongArray *pvdata = static_cast<PVULongArray*>(pv);
        ULongArrayData data;
        while (len > 0) {
            size_t num = pvdata->get(offset, len, data);
            if (num == 0)
                break;
            ULongArray dataArray = data.data;
            size_t dataOffset = data.offset;
            for (size_t i = 0; i < num; i++)
                to[i + toOffset] = dataArray[i + dataOffset];
            len -= num;
            offset += num;
            toOffset += num;
            ntransfered += num;
        }
        return ntransfered;
    }
    case pvFloat: {
        PVFloatArray *pvdata = static_cast<PVFloatArray*>(pv);
        FloatArrayData data;
        while (len > 0) {
            size_t num = pvdata->get(offset, len, data);
            if (num == 0) break;
            FloatArray dataArray = data.data;
            size_t dataOffset = data.offset;
            for (size_t i = 0; i < num; i++)
                to[i + toOffset] = dataArray[i + dataOffset];
            len -= num;
            offset += num;
            toOffset += num;
            ntransfered += num;
        }
        return ntransfered;
    }
    case pvDouble: {
        PVDoubleArray *pvdata = static_cast<PVDoubleArray*>(pv);
        DoubleArrayData data;
        while (len > 0) {
            size_t num = pvdata->get(offset, len, data);
            if (num == 0)
                break;
            DoubleArray dataArray = data.data;
            size_t dataOffset = data.offset;
            for (size_t i = 0; i < num; i++)
                to[i + toOffset] = dataArray[i + dataOffset];
            len -= num;
            offset += num;
            toOffset += num;
            ntransfered += num;
        }
        return ntransfered;
    }
    case pvString: {
        String message("convert StringArray to numeric not legal");
        throw std::invalid_argument(message);
    }
    }
     String message("Convert::convertToScalarArray should never get here");
    throw std::logic_error(message);
}

size_t convertFromByteArray(PVScalarArray *pv,
    size_t offset, size_t len,const int8 from[], size_t fromOffset)
{
    return convertFromScalarArray<PVByteArray,int8>(pv,offset,len,from,fromOffset);
}

size_t convertToByteArray(PVScalarArray * pv,
    size_t offset, size_t len,int8 to[], size_t toOffset)
{
    return convertToScalarArray<int8>(pv,offset,len,to,toOffset);
}

size_t convertFromShortArray(PVScalarArray *pv,
    size_t offset, size_t len,const int16 from[], size_t fromOffset)
{
    return convertFromScalarArray<PVShortArray,int16>(pv,offset,len,from,fromOffset);
}

size_t convertToShortArray(PVScalarArray * pv,
    size_t offset, size_t len,int16 to[], size_t toOffset)
{
    return convertToScalarArray<int16>(pv,offset,len,to,toOffset);
}

size_t convertFromIntArray(PVScalarArray *pv,
    size_t offset, size_t len,const int32 from[], size_t fromOffset)
{
    return convertFromScalarArray<PVIntArray,int32>(pv,offset,len,from,fromOffset);
}

size_t convertToIntArray(PVScalarArray * pv,
    size_t offset, size_t len,int32 to[], size_t toOffset)
{
    return convertToScalarArray<int32>(pv,offset,len,to,toOffset);
}

size_t convertFromLongArray(PVScalarArray *pv,
    size_t offset, size_t len,const int64 from[], size_t fromOffset)
{
    return convertFromScalarArray<PVLongArray,int64>(pv,offset,len,from,fromOffset);
}

size_t convertToLongArray(PVScalarArray * pv,
    size_t offset, size_t len,int64 to[], size_t toOffset)
{
    return convertToScalarArray<int64>(pv,offset,len,to,toOffset);
}

size_t convertFromUByteArray(PVScalarArray *pv,
    size_t offset, size_t len,const uint8 from[], size_t fromOffset)
{
    return convertFromScalarArray<PVUByteArray,uint8>(pv,offset,len,from,fromOffset);
}

size_t convertToUByteArray(PVScalarArray * pv,
    size_t offset, size_t len,uint8 to[], size_t toOffset)
{
    return convertToScalarArray<uint8>(pv,offset,len,to,toOffset);
}

size_t convertFromUShortArray(PVScalarArray *pv,
    size_t offset, size_t len,const uint16 from[], size_t fromOffset)
{
    return convertFromScalarArray<PVUShortArray,uint16>(pv,offset,len,from,fromOffset);
}

size_t convertToUShortArray(PVScalarArray * pv,
    size_t offset, size_t len,uint16 to[], size_t toOffset)
{
    return convertToScalarArray<uint16>(pv,offset,len,to,toOffset);
}

size_t convertFromUIntArray(PVScalarArray *pv,
    size_t offset, size_t len,const uint32 from[], size_t fromOffset)
{
    return convertFromScalarArray<PVUIntArray,uint32>(pv,offset,len,from,fromOffset);
}

size_t convertToUIntArray(PVScalarArray * pv,
    size_t offset, size_t len,uint32 to[], size_t toOffset)
{
    return convertToScalarArray<uint32>(pv,offset,len,to,toOffset);
}

size_t convertFromULongArray(PVScalarArray *pv,
    size_t offset, size_t len,const uint64 from[], size_t fromOffset)
{
    return convertFromScalarArray<PVULongArray,uint64>(pv,offset,len,from,fromOffset);
}

size_t convertToULongArray(PVScalarArray * pv,
    size_t offset, size_t len,uint64 to[], size_t toOffset)
{
    return convertToScalarArray<uint64>(pv,offset,len,to,toOffset);
}

size_t convertFromFloatArray(PVScalarArray *pv,
    size_t offset, size_t len,const float from[], size_t fromOffset)
{
    return convertFromScalarArray<PVFloatArray,float>(pv,offset,len,from,fromOffset);
}

size_t convertToFloatArray(PVScalarArray * pv,
    size_t offset, size_t len,float to[], size_t toOffset)
{
    return convertToScalarArray<float>(pv,offset,len,to,toOffset);
}

size_t convertFromDoubleArray(PVScalarArray *pv,
    size_t offset, size_t len,const double from[], size_t fromOffset)
{
    return convertFromScalarArray<PVDoubleArray,double>(pv,offset,len,from,fromOffset);
}

size_t convertToDoubleArray(PVScalarArray * pv,
    size_t offset, size_t len,double to[], size_t toOffset)
{
    return convertToScalarArray<double>(pv,offset,len,to,toOffset);
}

size_t convertFromStringArray(PVScalarArray *pv,
    size_t offset, size_t len,const StringArray & from, size_t fromOffset)
{
    ScalarType elemType = pv->getScalarArray()->getElementType();
    size_t ntransfered = 0;
    switch (elemType) {
    case pvBoolean: {
        PVBooleanArray *pvdata = static_cast<PVBooleanArray*>(pv);
        boolean data[1];
        while (len > 0) {
            String fromString = from[fromOffset];
            data[0] = (fromString.compare("true")==0) ? true : false;
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvByte: {
        PVByteArray *pvdata = static_cast<PVByteArray*>(pv);
        int8 data[1];
        while (len > 0) {
            String fromString = from[fromOffset];
            int ival;
            sscanf(fromString.c_str(),"%d",&ival);
            data[0] = ival;
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvShort: {
        PVShortArray *pvdata = static_cast<PVShortArray*>(pv);
        int16 data[1];
        while (len > 0) {
            String fromString = from[fromOffset];
            int ival;
            sscanf(fromString.c_str(),"%d",&ival);
            data[0] = ival;
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvInt: {
        PVIntArray *pvdata = static_cast<PVIntArray*>(pv);
        int32 data[1];
        while (len > 0) {
            String fromString = from[fromOffset];
            int ival;
            sscanf(fromString.c_str(),"%d",&ival);
            data[0] = ival;
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvLong: {
        PVLongArray *pvdata = static_cast<PVLongArray*>(pv);
        int64 data[1];
        while (len > 0) {
            String fromString = from[fromOffset];
            int64 ival;
            sscanf(fromString.c_str(),"%lld",(long long int *)&ival);
            data[0] = ival;
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvUByte: {
        PVUByteArray *pvdata = static_cast<PVUByteArray*>(pv);
        uint8 data[1];
        while (len > 0) {
            String fromString = from[fromOffset];
            unsigned int ival;
            sscanf(fromString.c_str(),"%u",&ival);
            data[0] = ival;
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvUShort: {
        PVUShortArray *pvdata = static_cast<PVUShortArray*>(pv);
        uint16 data[1];
        while (len > 0) {
            String fromString = from[fromOffset];
            unsigned int ival;
            sscanf(fromString.c_str(),"%u",&ival);
            data[0] = ival;
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvUInt: {
        PVUIntArray *pvdata = static_cast<PVUIntArray*>(pv);
        uint32 data[1];
        while (len > 0) {
            String fromString = from[fromOffset];
            unsigned int ival;
            sscanf(fromString.c_str(),"%u",&ival);
            data[0] = ival;
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvULong: {
        PVULongArray *pvdata = static_cast<PVULongArray*>(pv);
        uint64 data[1];
        while (len > 0) {
            String fromString = from[fromOffset];
            uint64 ival;
            sscanf(fromString.c_str(),"%lld",(unsigned long long int *)&ival);
            data[0] = ival;
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvFloat: {
        PVFloatArray *pvdata = static_cast<PVFloatArray*>(pv);
        float data[1];
        while (len > 0) {
            String fromString = from[fromOffset];
            float fval;
            sscanf(fromString.c_str(),"%f",&fval);
            data[0] = fval;
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvDouble: {
        PVDoubleArray *pvdata = static_cast<PVDoubleArray*>(pv);
        double data[1];
        while (len > 0) {
            String fromString = from[fromOffset];
            double fval;
            sscanf(fromString.c_str(),"%lf",&fval);
            data[0] = fval;
            if (pvdata->put(offset, 1, data, 0) == 0)
                return ntransfered;
            --len;
            ++ntransfered;
            ++offset;
            ++fromOffset;
        }
        return ntransfered;
    }
    case pvString:
        PVStringArray *pvdata = static_cast<PVStringArray*>(pv);
        while (len > 0) {
            String * xxx = const_cast<String *>(get(from));
            size_t n = pvdata->put(offset, len, xxx, fromOffset);
            if (n == 0)
                break;
            len -= n;
            offset += n;
            fromOffset += n;
            ntransfered += n;
        }
        return ntransfered;
    }
    String message("Convert::convertFromStringArray should never get here");
    throw std::logic_error(message);
}

size_t convertToStringArray(PVScalarArray *pv,
    size_t offset, size_t len,StringArray & xxx, size_t toOffset)
{
    String *to = &xxx[0];
    ScalarType elementType = pv->getScalarArray()->getElementType();
    size_t ncopy = pv->getLength();
    if (ncopy > len) ncopy = len;
    size_t num = ncopy;
    switch (elementType) {
    case pvBoolean: {
        PVBooleanArray *pvdata = static_cast<PVBooleanArray*>(pv);
        BooleanArrayData data;
        for (size_t i = 0; i < num; i++) {
            if (pvdata->get(offset + i, 1, data) == 1) {
                BooleanArray dataArray = data.data;
                bool value = dataArray[data.offset];
                to[toOffset + i] = value ? trueString : falseString;
            } else {
                to[toOffset + i] = "bad pv";
            }
        }
    }
    break;
    case pvByte: {
        PVByteArray *pvdata = static_cast<PVByteArray*>(pv);
        ByteArrayData data;
        char cr[30];
        for (size_t i = 0; i < num; i++) {
            if (pvdata->get(offset + i, 1, data) == 1) {
                ByteArray dataArray = data.data;
                int ival = dataArray[data.offset];
                sprintf(cr,"%d",ival);
                to[toOffset + i] = String(cr);
            } else {
                to[toOffset + i] = "bad pv";
            }
        }
    }
    break;
    case pvShort: {
        PVShortArray *pvdata = static_cast<PVShortArray*>(pv);
        ShortArrayData data;
        char cr[30];
        for (size_t i = 0; i < num; i++) {
            if (pvdata->get(offset + i, 1, data) == 1) {
                ShortArray dataArray = data.data;
                int ival = dataArray[data.offset];
                sprintf(cr,"%d",ival);
                to[toOffset + i] = String(cr);
            } else {
                to[toOffset + i] = "bad pv";
            }
        }
    }
    break;
    case pvInt: {
        PVIntArray *pvdata = static_cast<PVIntArray*>(pv);
        IntArrayData data;
        char cr[30];
        for (size_t i = 0; i < num; i++) {
            if (pvdata->get(offset + i, 1, data) == 1) {
                IntArray dataArray = data.data;
                int ival = dataArray[data.offset];
                sprintf(cr,"%d",ival);
                to[toOffset + i] = String(cr);
            } else {
                to[toOffset + i] = "bad pv";
            }
        }
    }
    break;
    case pvLong: {
        PVLongArray *pvdata = static_cast<PVLongArray*>(pv);
        LongArrayData data = LongArrayData();
        char cr[30];
        for (size_t i = 0; i < num; i++) {
            if (pvdata->get(offset + i, 1, data) == 1) {
                LongArray dataArray = data.data;
                int64 ival = dataArray[data.offset];
                sprintf(cr,"%lld",(long long)ival);
                to[toOffset + i] = String(cr);
            } else {
                to[toOffset + i] = "bad pv";
            }
        }
    }
    break;
    case pvUByte: {
        PVUByteArray *pvdata = static_cast<PVUByteArray*>(pv);
        UByteArrayData data;
        char cr[30];
        for (size_t i = 0; i < num; i++) {
            if (pvdata->get(offset + i, 1, data) == 1) {
                UByteArray dataArray = data.data;
                unsigned int ival = dataArray[data.offset];
                sprintf(cr,"%u",ival);
                to[toOffset + i] = String(cr);
            } else {
                to[toOffset + i] = "bad pv";
            }
        }
    }
    break;
    case pvUShort: {
        PVUShortArray *pvdata = static_cast<PVUShortArray*>(pv);
        UShortArrayData data;
        char cr[30];
        for (size_t i = 0; i < num; i++) {
            if (pvdata->get(offset + i, 1, data) == 1) {
                UShortArray dataArray = data.data;
                unsigned int ival = dataArray[data.offset];
                sprintf(cr,"%u",ival);
                to[toOffset + i] = String(cr);
            } else {
                to[toOffset + i] = "bad pv";
            }
        }
    }
    break;
    case pvUInt: {
        PVUIntArray *pvdata = static_cast<PVUIntArray*>(pv);
        UIntArrayData data;
        char cr[30];
        for (size_t i = 0; i < num; i++) {
            if (pvdata->get(offset + i, 1, data) == 1) {
                UIntArray dataArray = data.data;
                unsigned int ival = dataArray[data.offset];
                sprintf(cr,"%u",ival);
                to[toOffset + i] = String(cr);
            } else {
                to[toOffset + i] = "bad pv";
            }
        }
    }
    break;
    case pvULong: {
        PVULongArray *pvdata = static_cast<PVULongArray*>(pv);
        ULongArrayData data;
        char cr[30];
        for (size_t i = 0; i < num; i++) {
            if (pvdata->get(offset + i, 1, data) == 1) {
                ULongArray dataArray = data.data;
                uint64 ival = dataArray[data.offset];
                sprintf(cr,"%llu",(unsigned long long)ival);
                to[toOffset + i] = String(cr);
            } else {
                to[toOffset + i] = "bad pv";
            }
        }
    }
    break;
    case pvFloat: {
        PVFloatArray *pvdata = static_cast<PVFloatArray*>(pv);
        FloatArrayData data;
        char cr[30];
        for (size_t i = 0; i < num; i++) {
            if (pvdata->get(offset + i, 1, data) == 1) {
                FloatArray dataArray = data.data;
                float fval = dataArray[data.offset];
                sprintf(cr,"%g",fval);
                to[toOffset + i] = String(cr);
            } else {
                to[toOffset + i] = "bad pv";
            }
        }
    }
    break;
    case pvDouble: {
        PVDoubleArray *pvdata = static_cast<PVDoubleArray*>(pv);
        DoubleArrayData data;
        char cr[30];
        for (size_t i = 0; i < num; i++) {
            if (pvdata->get(offset + i, 1, data) == 1) {
                DoubleArray dataArray = data.data;
                double fval = dataArray[data.offset];
                sprintf(cr,"%g",fval);
                to[toOffset + i] = String(cr);
            } else {
                to[toOffset + i] = "bad pv";
            }
        }
    }
    break;
    case pvString: {
        PVStringArray *pvdata = static_cast<PVStringArray*>(pv);
        while (num > 0) {
            size_t numnow = 0;
            size_t dataOffset = 0;
            String *dataArray;
            StringArrayData stringArrayData;
            numnow = pvdata->get(offset, num, stringArrayData);
            dataArray = pvdata->get();
            dataOffset = stringArrayData.offset;
            if (numnow <= 0) {
                for (size_t i = 0; i < num; i++)
                    to[toOffset + i] = "bad pv";
                break;
            }
            for(size_t i=0; i<num; i++) to[toOffset+i] = dataArray[dataOffset+i];
            num -= numnow;
            offset += numnow;
            toOffset += numnow;
        }
    }
    break;
    default:
        String message("Convert::convertToStringArray should never get here");
        throw std::logic_error(message);
    }
    return ncopy;
}


void convertToString(StringBuilder buffer,PVField const * pv,int indentLevel)
{
    Type type = pv->getField()->getType();
    if(type==scalarArray) {
        convertArray(buffer,static_cast<PVScalarArray const *>(pv),indentLevel);
        return;
    }
    if(type==structure) {
        convertStructure(buffer,static_cast<PVStructure const *>(pv),indentLevel);
        return;
    }
    if(type==structureArray) {
    	convertStructureArray(
            buffer,static_cast<PVStructureArray const *>(pv),indentLevel);
        return;
    }
    PVScalar const *pvScalar = static_cast<PVScalar const *>(pv);
    const ScalarConstPtr & pscalar = pvScalar->getScalar();
    ScalarType scalarType = pscalar->getScalarType();
    *buffer += pscalar->getID();
    *buffer += " ";
    *buffer += pv->getFieldName();
    *buffer += " ";
    switch(scalarType) {
    case pvBoolean: {
            PVBoolean const *data = static_cast<PVBoolean const *>(pv);
            bool value = data->get();
            if(value) {
                *buffer += "true";
            } else {
                *buffer += "false";
            }
        }
        return;
    case pvByte: {
            PVByte const *data = static_cast<PVByte const *>(pv);
            char xxx[30];
            sprintf(xxx,"%d",(int)data->get());
            *buffer += xxx;
        }
        return;
    case pvShort: {
            PVShort const  *data = static_cast<PVShort const *>(pv);
            char xxx[30];
            sprintf(xxx,"%d",(int)data->get());
            *buffer += xxx;
        }
        return;
    case pvInt: {
            PVInt const  *data = static_cast<PVInt const *>(pv);
            char xxx[30];
            sprintf(xxx,"%d",(int)data->get());
            *buffer += xxx;
        }
        return;
    case pvLong: {
            PVLong const  *data = static_cast<PVLong const *>(pv);
            char xxx[30];
            sprintf(xxx,"%lld",(long long)data->get());
            *buffer += xxx;
        }
        return;
    case pvUByte: {
            PVUByte const  *data = static_cast<PVUByte const *>(pv);
            char xxx[30];
            sprintf(xxx,"%u",(unsigned int)data->get());
            *buffer += xxx;
        }
        return;
    case pvUShort: {
            PVUShort const  *data = static_cast<PVUShort const *>(pv);
            char xxx[30];
            sprintf(xxx,"%u",(unsigned int)data->get());
            *buffer += xxx;
        }
        return;
    case pvUInt: {
            PVUInt const  *data = static_cast<PVUInt const *>(pv);
            char xxx[30];
            sprintf(xxx,"%u",(unsigned int)data->get());
            *buffer += xxx;
        }
        return;
    case pvULong: {
            PVULong const  *data = static_cast<PVULong const *>(pv);
            char xxx[30];
            sprintf(xxx,"%llu",(unsigned long long)data->get());
            *buffer += xxx;
        }
        return;
    case pvFloat: {
            PVFloat const  *data = static_cast<PVFloat const *>(pv);
            char xxx[30];
            sprintf(xxx,"%g",data->get());
            *buffer += xxx;
        }
        return;
    case pvDouble: {
            PVDouble const  *data = static_cast<PVDouble const *>(pv);
            char xxx[30];
            sprintf(xxx,"%lg",data->get());
            *buffer += xxx;
        }
        return;
    case pvString: {
            PVString const  *data = static_cast<PVString const *>(pv);
            *buffer += data->get();
        }
        return;
    default:
        *buffer += "unknown ScalarType";
    }
}

void convertStructure(StringBuilder buffer,PVStructure const *data,int indentLevel)
{
    *buffer += data->getStructure()->getID() + " " + data->getFieldName();
    String extendsName = data->getExtendsStructureName();
    if(extendsName.length()>0) {
        *buffer += " extends " + extendsName;
    }
    PVFieldPtrArray const & fieldsData = data->getPVFields();
    if (fieldsData.size() != 0) {
        int length = data->getStructure()->getNumberFields();
        for(int i=0; i<length; i++) {
            convert->newLine(buffer, indentLevel+1);
            PVFieldPtr fieldField = fieldsData[i];
            fieldField->toString(buffer,indentLevel + 1);
        }
    }
}

void convertArray(StringBuilder buffer,PVScalarArray const * xxx,int indentLevel)
{
    PVScalarArray *pv = const_cast<PVScalarArray *>(xxx);
    ScalarArrayConstPtr array = pv->getScalarArray();
    ScalarType type = array->getElementType();
    *buffer += array->getID() + " " + pv->getFieldName() + " ";
    switch(type) {
    case pvBoolean: {
            PVBooleanArray *pvdata = static_cast<PVBooleanArray *>(pv);
            BooleanArrayData data;
            *buffer += "[";
            for(size_t i=0; i < pvdata->getLength(); i++) {
                if(i!=0) *buffer += ",";
                size_t num = pvdata->get(i,1,data);
                if(num==1) {
                     BooleanArray  value = data.data;
                     if(value[data.offset]) {
                         *buffer += "true";
                     } else {
                         *buffer += "false";
                     }
                } else {
                     *buffer += "???? ";
                }
            }
            *buffer += "]";
            break;
        }
    case pvByte: {
            PVByteArray *pvdata = static_cast<PVByteArray*>(pv);
            ByteArrayData data;
            *buffer += "[";
            for(size_t i=0; i < pvdata->getLength(); i++) {
                if(i!=0) *buffer += ",";
                size_t num = pvdata->get(i,1,data);
                if(num==1) {
                     int val = data.data[data.offset];
                     char buf[16];
                     sprintf(buf,"%d",val);
                     *buffer += buf;
                } else {
                     *buffer += "???? ";
                }
            }
            *buffer += "]";
            break;
        }
    case pvShort: {
            PVShortArray *pvdata = static_cast<PVShortArray*>(pv);
            ShortArrayData data;
            *buffer += "[";
            for(size_t i=0; i < pvdata->getLength(); i++) {
                if(i!=0) *buffer += ',';
                size_t num = pvdata->get(i,1,data);
                if(num==1) {
                     int val = data.data[data.offset];
                     char buf[16];
                     sprintf(buf,"%d",val);
                     *buffer += buf;
                } else {
                     *buffer += "???? ";
                }
            }
            *buffer += "]";
            break;
        }
    case pvInt: {
            PVIntArray *pvdata = static_cast<PVIntArray*>(pv);
            IntArrayData data;
            *buffer += "[";
            for(size_t i=0; i < pvdata->getLength(); i++) {
                if(i!=0) *buffer += ',';
                size_t num = pvdata->get(i,1,data);
                if(num==1) {
                     int val = data.data[data.offset];
                     char buf[16];
                     sprintf(buf,"%d",val);
                     *buffer += buf;
                } else {
                     *buffer += "???? ";
                }
            }
            *buffer += "]";
            break;
        }
    case pvLong: {
            PVLongArray *pvdata = static_cast<PVLongArray*>(pv);
            LongArrayData data;
            *buffer += "[";
            for(size_t i=0; i < pvdata->getLength(); i++) {
                if(i!=0) *buffer += ',';
                size_t num = pvdata->get(i,1,data);
                if(num==1) {
                     int64 val = data.data[data.offset];
                     char buf[32];
                     sprintf(buf,"%lld",(long long)val);
                     *buffer += buf;
                } else {
                     *buffer += "???? ";
                }
            }
            *buffer += "]";
            break;
        }
    case pvUByte: {
            PVUByteArray *pvdata = static_cast<PVUByteArray*>(pv);
            UByteArrayData data;
            *buffer += "[";
            for(size_t i=0; i < pvdata->getLength(); i++) {
                if(i!=0) *buffer += ",";
                size_t num = pvdata->get(i,1,data);
                if(num==1) {
                      unsigned int val = data.data[data.offset];
                     char buf[16];
                     sprintf(buf,"%u",val);
                     *buffer += buf;
                } else {
                     *buffer += "???? ";
                }
            }
            *buffer += "]";
            break;
        }
    case pvUShort: {
            PVUShortArray *pvdata = static_cast<PVUShortArray*>(pv);
            UShortArrayData data;
            *buffer += "[";
            for(size_t i=0; i < pvdata->getLength(); i++) {
                if(i!=0) *buffer += ',';
                size_t num = pvdata->get(i,1,data);
                if(num==1) {
                    unsigned  int val = data.data[data.offset];
                     char buf[16];
                     sprintf(buf,"%u",val);
                     *buffer += buf;
                } else {
                     *buffer += "???? ";
                }
            }
            *buffer += "]";
            break;
        }
    case pvUInt: {
            PVUIntArray *pvdata = static_cast<PVUIntArray*>(pv);
            UIntArrayData data;
            *buffer += "[";
            for(size_t i=0; i < pvdata->getLength(); i++) {
                if(i!=0) *buffer += ',';
                size_t num = pvdata->get(i,1,data);
                if(num==1) {
                     unsigned int val = data.data[data.offset];
                     char buf[16];
                     sprintf(buf,"%u",val);
                     *buffer += buf;
                } else {
                     *buffer += "???? ";
                }
            }
            *buffer += "]";
            break;
        }
    case pvULong: {
            PVULongArray *pvdata = static_cast<PVULongArray*>(pv);
            ULongArrayData data;
            *buffer += "[";
            for(size_t i=0; i < pvdata->getLength(); i++) {
                if(i!=0) *buffer += ',';
                size_t num = pvdata->get(i,1,data);
                if(num==1) {
                     uint64 val = data.data[data.offset];
                     char buf[32];
                     sprintf(buf,"%llu",(unsigned long long)val);
                     *buffer += buf;
                } else {
                     *buffer += "???? ";
                }
            }
            *buffer += "]";
            break;
        }
    case pvFloat: {
            PVFloatArray *pvdata = static_cast<PVFloatArray*>(pv);
            FloatArrayData data;
            *buffer += "[";
            for(size_t i=0; i < pvdata->getLength(); i++) {
                if(i!=0) *buffer += ',';
                size_t num = pvdata->get(i,1,data);
                if(num==1) {
                     float val = data.data[data.offset];
                     char buf[16];
                     sprintf(buf,"%g",val);
                     *buffer += buf;
                } else {
                     *buffer += "???? ";
                }
            }
            *buffer += "]";
            break;
        }
    case pvDouble: {
            PVDoubleArray *pvdata = static_cast<PVDoubleArray*>(pv);
            DoubleArrayData data;
            *buffer += "[";
            for(size_t i=0; i < pvdata->getLength(); i++) {
                if(i!=0) *buffer += ',';
                size_t num = pvdata->get(i,1,data);
                if(num==1) {
                     double val = data.data[data.offset];
                     char buf[16];
                     sprintf(buf,"%lg",val);
                     *buffer += buf;
                } else {
                     *buffer += "???? ";
                }
            }
            *buffer += ("]");
            break;
        }
    case pvString: {
    	PVStringArray *pvdata = static_cast<PVStringArray*>(pv);
    	StringArrayData data;
    	*buffer += "[";
    	for(size_t i=0; i < pvdata->getLength(); i++) {
    		if(i!=0) *buffer += ",";
    		size_t num = pvdata->get(i,1,data);
    		StringArray value = data.data;
                if(num==1) {
                    if(value[data.offset].length()>0) {
                         *buffer += value[data.offset].c_str();
                    } else {
                         *buffer += "null";
                    }
    		} else {
    			*buffer += "null";
    		}
    	}
    	*buffer += "]";
    	break;
    }
    default:
        *buffer += " array element is unknown ScalarType";
    }
    if(pv->isImmutable()) {
        *buffer += " immutable ";
    }
}

void convertStructureArray(StringBuilder buffer,
    PVStructureArray const * xxx,int indentLevel)
{
    PVStructureArray *pvdata = const_cast<PVStructureArray *>(xxx);
    *buffer += pvdata->getStructureArray()->getID() + " " + pvdata->getFieldName() + " ";
    size_t length = pvdata->getLength();
    if(length<=0) {
        return;
    }
    StructureArrayData data = StructureArrayData();
    pvdata->get(0, length, data);
    for (size_t i = 0; i < length; i++) {
        convert->newLine(buffer, indentLevel + 1);
        PVStructurePtr pvStructure = data.data[i];
        if (pvStructure.get() == 0) {
            *buffer += "null";
        } else {
            pvStructure->toString(buffer,indentLevel+1);
        }
    }
}

size_t copyArrayDataReference(PVScalarArray *from,PVArray *to)
{
    ScalarType scalarType = from->getScalarArray()->getElementType();
    switch (scalarType) {
    case pvBoolean: {
        PVBooleanArray *pvfrom = (PVBooleanArray*) from;
        PVBooleanArray *pvto = (PVBooleanArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    case pvByte: {
        PVByteArray *pvfrom = (PVByteArray*) from;
        PVByteArray *pvto = (PVByteArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    case pvShort: {
        PVShortArray *pvfrom = (PVShortArray*) from;
        PVShortArray *pvto = (PVShortArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    case pvInt: {
        PVIntArray *pvfrom = (PVIntArray*) from;
        PVIntArray *pvto = (PVIntArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    case pvLong: {
        PVLongArray *pvfrom = (PVLongArray*) from;
        PVLongArray *pvto = (PVLongArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    case pvUByte: {
        PVUByteArray *pvfrom = (PVUByteArray*) from;
        PVUByteArray *pvto = (PVUByteArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    case pvUShort: {
        PVUShortArray *pvfrom = (PVUShortArray*) from;
        PVUShortArray *pvto = (PVUShortArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    case pvUInt: {
        PVUIntArray *pvfrom = (PVUIntArray*) from;
        PVUIntArray *pvto = (PVUIntArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    case pvULong: {
        PVULongArray *pvfrom = (PVULongArray*) from;
        PVULongArray *pvto = (PVULongArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    case pvFloat: {
        PVFloatArray *pvfrom = (PVFloatArray*) from;
        PVFloatArray *pvto = (PVFloatArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    case pvDouble: {
        PVDoubleArray *pvfrom = (PVDoubleArray*) from;
        PVDoubleArray *pvto = (PVDoubleArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    case pvString: {
        PVStringArray *pvfrom = (PVStringArray*) from;
        PVStringArray *pvto = (PVStringArray*) to;
        pvto->shareData(
            pvfrom->getSharedVector(),pvfrom->getCapacity(),pvfrom->getLength());
        break;
    }
    }
    to->setImmutable();
    return from->getLength();
}

size_t copyNumericArray(PVScalarArray *from, size_t offset, PVScalarArray *to, size_t toOffset, size_t len)
{
    ScalarType fromElementType = from->getScalarArray()->getElementType();
    size_t ncopy = 0;
    switch (fromElementType) {
    case pvBoolean:
       throw std::logic_error(String("PVBooleanArray is not a numeric array"));
    case pvByte: {
        PVByteArray *pvfrom = (PVByteArray*) from;
        while (len > 0) {
            size_t num = 0;
            ByteArrayData arrayData = ByteArrayData();
            num = pvfrom->get(offset, len, arrayData);
            int8 * data = get(arrayData.data);
            size_t dataOffset = arrayData.offset;
            if (num <= 0) break;
            while (num > 0) {
                size_t n = convertFromByteArray(
                     to, toOffset, num, data, dataOffset);
                if (n <= 0) break;
                len -= n;
                num -= n;
                ncopy += n;
                offset += n;
                toOffset += n;
            }
        }
        break;
    }
    case pvShort: {
        PVShortArray *pvfrom = (PVShortArray*) from;
        while (len > 0) {
            size_t num = 0;
            ShortArrayData arrayData = ShortArrayData();
            num = pvfrom->get(offset, len, arrayData);
            int16 * data = get(arrayData.data);
            size_t dataOffset = arrayData.offset;
            if (num <= 0) break;
            while (num > 0) {
                size_t n = convertFromShortArray(
                    to, toOffset, num, data, dataOffset);
                if (n <= 0) break;
                len -= n;
                num -= n;
                ncopy += n;
                offset += n;
                toOffset += n;
            }
        }
        break;
    }
    case pvInt: {
        PVIntArray *pvfrom = (PVIntArray*) from;
        while (len > 0) {
            size_t num = 0;
            IntArrayData arrayData = IntArrayData();
            num = pvfrom->get(offset, len, arrayData);
            int32 * data = get(arrayData.data);
            size_t dataOffset = arrayData.offset;
            if (num <= 0) break;
            while (num > 0) {
                size_t n = convertFromIntArray(
                    to, toOffset, num, data, dataOffset);
                if (n <= 0) break;
                len -= n;
                num -= n;
                ncopy += n;
                offset += n;
                toOffset += n;
            }
        }
        break;
    }
    case pvLong: {
        PVLongArray *pvfrom = (PVLongArray*) from;
        while (len > 0) {
            size_t num = 0;
            LongArrayData arrayData = LongArrayData();
            num = pvfrom->get(offset, len, arrayData);
            int64 * data = get(arrayData.data);
            size_t dataOffset = arrayData.offset;
            if (num <= 0) break;
            while (num > 0) {
                size_t n = convertFromLongArray(
                    to, toOffset, num, data, dataOffset);
                if (n <= 0) break;
                len -= n;
                num -= n;
                ncopy += n;
                offset += n;
                toOffset += n;
            }
        }
        break;
    }
    case pvUByte: {
        PVUByteArray *pvfrom = (PVUByteArray*) from;
        while (len > 0) {
            size_t num = 0;
            UByteArrayData arrayData = UByteArrayData();
            num = pvfrom->get(offset, len, arrayData);
            uint8 * data = get(arrayData.data);
            size_t dataOffset = arrayData.offset;
            if (num <= 0) break;
            while (num > 0) {
                size_t n = convertFromUByteArray(
                     to, toOffset, num, data, dataOffset);
                if (n <= 0) break;
                len -= n;
                num -= n;
                ncopy += n;
                offset += n;
                toOffset += n;
            }
        }
        break;
    }
    case pvUShort: {
        PVUShortArray *pvfrom = (PVUShortArray*) from;
        while (len > 0) {
            size_t num = 0;
            UShortArrayData arrayData = UShortArrayData();
            num = pvfrom->get(offset, len, arrayData);
            uint16 * data = get(arrayData.data);
            size_t dataOffset = arrayData.offset;
            if (num <= 0) break;
            while (num > 0) {
                size_t n = convertFromUShortArray(
                    to, toOffset, num, data, dataOffset);
                if (n <= 0) break;
                len -= n;
                num -= n;
                ncopy += n;
                offset += n;
                toOffset += n;
            }
        }
        break;
    }
    case pvUInt: {
        PVUIntArray *pvfrom = (PVUIntArray*) from;
        while (len > 0) {
            size_t num = 0;
            UIntArrayData arrayData = UIntArrayData();
            num = pvfrom->get(offset, len, arrayData);
            uint32 * data = get(arrayData.data);
            size_t dataOffset = arrayData.offset;
            if (num <= 0) break;
            while (num > 0) {
                size_t n = convertFromUIntArray(
                    to, toOffset, num, data, dataOffset);
                if (n <= 0) break;
                len -= n;
                num -= n;
                ncopy += n;
                offset += n;
                toOffset += n;
            }
        }
        break;
    }
    case pvULong: {
        PVULongArray *pvfrom = (PVULongArray*) from;
        while (len > 0) {
            size_t num = 0;
            ULongArrayData arrayData = ULongArrayData();
            num = pvfrom->get(offset, len, arrayData);
            uint64 * data = get(arrayData.data);
            size_t dataOffset = arrayData.offset;
            if (num <= 0) break;
            while (num > 0) {
                size_t n = convertFromULongArray(
                    to, toOffset, num, data, dataOffset);
                if (n <= 0) break;
                len -= n;
                num -= n;
                ncopy += n;
                offset += n;
                toOffset += n;
            }
        }
        break;
    }
    case pvFloat: {
        PVFloatArray *pvfrom = (PVFloatArray*) from;
        while (len > 0) {
            size_t num = 0;
            FloatArrayData floatArrayData = FloatArrayData();
            num = pvfrom->get(offset, len, floatArrayData);
            float * data = get(floatArrayData.data);
            size_t dataOffset = floatArrayData.offset;
            if (num <= 0) break;
            while (num > 0) {
                size_t n = convertFromFloatArray(
                    to, toOffset, num, data, dataOffset);
                if (n <= 0) break;
                len -= n;
                num -= n;
                ncopy += n;
                offset += n;
                toOffset += n;
            }
        }
        break;
    }
    case pvDouble: {
        PVDoubleArray *pvfrom = (PVDoubleArray*) from;
        while (len > 0) {
            size_t num = 0;
            DoubleArrayData doubleArrayData = DoubleArrayData();
            num = pvfrom->get(offset, len, doubleArrayData);
            double * data = get(doubleArrayData.data);
            size_t dataOffset = doubleArrayData.offset;
            if (num <= 0) break;
            while (num > 0) {
                size_t n = convertFromDoubleArray(
                    to, toOffset, num, data, dataOffset);
                if (n <= 0) break;
                len -= n;
                num -= n;
                ncopy += n;
                offset += n;
                toOffset += n;
            }
        }
        break;
    }
    case pvString:
       throw std::logic_error(String("PVStringArray is not a numeric array"));
    }
    return ncopy;
}

ConvertPtr Convert::getConvert()
{
    static Mutex mutex;
    Lock xx(mutex);

    if(convert.get()==0) {
        convert = ConvertPtr(new Convert());
        pvDataCreate = getPVDataCreate();
    }
    return convert;
}

ConvertPtr getConvert() {
    return Convert::getConvert();
}

}}