George McIntyre
78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/*
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* pvxs 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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* Author George S. McIntyre <george@level-n.com>, 2023
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*
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*/
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#include <sstream>
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#include <utility>
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#include "field.h"
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namespace pvxs {
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namespace ioc {
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/**
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* Construct a Field from a field name and channel name
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*
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* @param stringFieldName the field name
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* @param stringChannelName the channel name
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*/
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Field::Field(const std::string& stringFieldName, const std::string& stringChannelName, std::string id)
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:id(std::move(id)), fieldName(stringFieldName), isMeta(false), allowProc(false), isArray(false),
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value(stringChannelName),
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properties(stringChannelName) {
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if (!fieldName.fieldNameComponents.empty()) {
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name = fieldName.fieldNameComponents[0].name;
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fullName = std::string(fieldName.to_string());
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if (fieldName.fieldNameComponents[fieldName.fieldNameComponents.size() - 1].isArray()) {
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isArray = true;
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}
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}
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}
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/**
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* Using the field components configured in this Field, walk down from the given value,
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* to arrive at the part of the value referenced by this field.
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*
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* @param valueTarget the given value to search in
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* @return the Value referenced by this field within the given value
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*/
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Value Field::findIn(Value valueTarget) const {
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if (!fieldName.empty()) {
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for (const auto& component: fieldName.fieldNameComponents) {
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valueTarget = valueTarget[component.name];
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if (component.isArray()) {
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// Get required array capacity
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auto index = component.index;
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shared_array<const Value> constValueArray = valueTarget.as<shared_array<const Value>>();
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valueTarget = shared_array<const Value>();
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shared_array<Value> valueArray(constValueArray.thaw());
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auto size = valueArray.size();
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if ((index + 1) > size) {
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valueArray.resize(index + 1);
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}
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// Put new data into array
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auto newElement = valueArray[index];
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if (!newElement) {
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// Only allocate new member if it is not already allocated
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valueArray[index] = newElement = valueTarget.allocMember();
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}
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valueTarget = valueArray.freeze();
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valueTarget = newElement;
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}
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}
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}
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return valueTarget;
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}
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} // pvxs
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} // ioc
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