88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
/* pvControl.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 "pvControl.h"
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namespace epics { namespace pvData {
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static String noControlFound("No control structure found");
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static String notAttached("Not attached to an control structure");
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bool PVControl::attach(PVField *pvField)
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{
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PVStructure *pvStructure = 0;
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if(pvField->getField()->getFieldName().compare("control")!=0) {
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if(pvField->getField()->getFieldName().compare("value")!=0) {
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pvField->message(noControlFound,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(noControlFound,errorMessage);
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return false;
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}
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pvStructure = pvParent->getStructureField(String("control"));
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if(pvStructure==0) {
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pvField->message(noControlFound,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(noControlFound,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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PVDouble *pvDouble = pvStructure->getDoubleField(String("limit.low"));
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if(pvDouble==0) {
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pvField->message(noControlFound,errorMessage);
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return false;
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}
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pvLow = pvDouble;
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pvDouble = pvStructure->getDoubleField(String("limit.high"));
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if(pvDouble==0) {
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pvLow = 0;
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pvField->message(noControlFound,errorMessage);
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return false;
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}
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pvHigh = pvDouble;
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return true;
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}
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void PVControl::detach()
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{
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pvLow = 0;
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pvHigh = 0;
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}
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Control PVControl::get() const
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{
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if(pvLow==0 || pvHigh==0) {
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throw std::logic_error(notAttached);
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}
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Control control;
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control.setLow(pvLow->get());
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control.setHigh(pvHigh->get());
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return control;
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}
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bool PVControl::set(Control control)
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{
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if(pvLow==0 || pvHigh==0) {
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throw std::logic_error(notAttached);
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}
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if(pvLow->isImmutable() || pvHigh->isImmutable()) return false;
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pvLow->put(control.getLow());
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pvHigh->put(control.getHigh());
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return true;
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}
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}}
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