114 lines
3.4 KiB
C++
114 lines
3.4 KiB
C++
/* pvDisplay.cpp */
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/**
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* EPICS pvDataCPP is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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*/
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#include <string>
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#include <stdexcept>
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#include "pvType.h"
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#include "pvIntrospect.h"
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#include "pvData.h"
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#include "pvDisplay.h"
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namespace epics { namespace pvData {
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static String noDisplayFound("No display structure found");
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static String notAttached("Not attached to an display structure");
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bool PVDisplay::attach(PVField *pvField)
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{
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PVStructure *pvStructure = 0;
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if(pvField->getField()->getFieldName().compare("display")!=0) {
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if(pvField->getField()->getFieldName().compare("value")!=0) {
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pvField->message(noDisplayFound,errorMessage);
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return false;
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}
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PVStructure *pvParent = pvField->getParent();
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if(pvParent==0) {
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pvField->message(noDisplayFound,errorMessage);
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return false;
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}
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pvStructure = pvParent->getStructureField(String("display"));
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if(pvStructure==0) {
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pvField->message(noDisplayFound,errorMessage);
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return false;
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}
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} else {
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if(pvField->getField()->getType()!=structure) {
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pvField->message(noDisplayFound,errorMessage);
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return false;
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}
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pvStructure = static_cast<PVStructure*>(pvField);
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}
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pvDescription = pvStructure->getStringField(String("description"));
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if(pvDescription==0) {
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pvField->message(noDisplayFound,errorMessage);
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return false;
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}
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pvFormat = pvStructure->getStringField(String("format"));
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if(pvFormat==0) {
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pvField->message(noDisplayFound,errorMessage);
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detach();
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return false;
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}
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pvUnits = pvStructure->getStringField(String("units"));
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if(pvUnits==0) {
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pvField->message(noDisplayFound,errorMessage);
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detach();
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return false;
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}
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pvLow = pvStructure->getDoubleField(String("limit.low"));
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if(pvLow==0) {
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pvField->message(noDisplayFound,errorMessage);
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detach();
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return false;
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}
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pvHigh = pvStructure->getDoubleField(String("limit.high"));
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if(pvHigh==0) {
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pvField->message(noDisplayFound,errorMessage);
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detach();
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return false;
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}
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return true;
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}
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void PVDisplay::detach()
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{
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pvDescription = 0;
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pvFormat = 0;
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pvUnits = 0;
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pvLow = 0;
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pvHigh = 0;
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}
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Display PVDisplay::get() const
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{
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if(pvDescription==0 || pvFormat==0 || pvUnits==0 || pvLow==0 || pvHigh==0) {
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throw std::logic_error(notAttached);
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}
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Display display;
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display.setDescription(pvDescription->get());
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display.setFormat(pvFormat->get());
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display.setUnits(pvUnits->get());
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display.setLow(pvLow->get());
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display.setHigh(pvHigh->get());
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return display;
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}
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bool PVDisplay::set(Display display)
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{
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if(pvDescription==0 || pvFormat==0 || pvUnits==0 || pvLow==0 || pvHigh==0) {
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throw std::logic_error(notAttached);
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}
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if(pvDescription->isImmutable() || pvFormat->isImmutable()) return false;
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if(pvUnits->isImmutable() || pvLow->isImmutable() || pvHigh->isImmutable()) return false;
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pvDescription->put(display.getDescription());
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pvFormat->put(display.getFormat());
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pvUnits->put(display.getUnits());
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pvLow->put(display.getLow());
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pvHigh->put(display.getHigh());
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return true;
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}
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}}
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