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NodeReferenceContext.java
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NodeReferenceContext.java
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/*
* JB4JSON-LD
* Copyright (C) 2023 Czech Technical University in Prague
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3.0 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library.
*/
package cz.cvut.kbss.jsonld.deserialization;
import cz.cvut.kbss.jsonld.JsonLd;
import cz.cvut.kbss.jsonld.deserialization.util.DataTypeTransformer;
import java.lang.reflect.Field;
import java.util.Map;
/**
* Represents deserialization context of a plain identifier object property.
*/
class NodeReferenceContext<T> extends InstanceContext<T> {
private final InstanceContext<?> owner;
private final Field targetField;
NodeReferenceContext(InstanceContext<?> owner, Field targetField, Map<String, Object> knownInstances) {
super(null, knownInstances);
this.owner = owner;
this.targetField = targetField;
}
NodeReferenceContext(InstanceContext<?> owner, Map<String, Object> knownInstances) {
super(null, knownInstances);
this.owner = owner;
this.targetField = null;
}
@Override
void setIdentifierValue(String value) {
final Class<?> targetType = targetField != null ? targetField.getType() : owner.getItemType();
this.instance = (T) transformToTargetType(value, targetType);
}
private Object transformToTargetType(String id, Class<?> targetType) {
return DataTypeTransformer.transformValue(id, targetType);
}
@Override
void close() {
assert instance != null;
if (targetField != null) {
owner.setFieldValue(targetField, instance);
} else {
owner.addItem(instance);
}
}
@Override
boolean isPropertyMapped(String property) {
return property.equals(JsonLd.ID);
}
@Override
boolean supports(String property) {
return isPropertyMapped(property);
}
@Override
Class<T> getInstanceType() {
return null;
}
@Override
Field getFieldForProperty(String property) {
return null;
}
@Override
boolean hasPropertiesField() {
return false;
}
}