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InstanceContext.java
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InstanceContext.java
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package cz.cvut.kbss.jsonld.deserialization;
import cz.cvut.kbss.jsonld.common.BeanAnnotationProcessor;
import cz.cvut.kbss.jsonld.common.BeanClassProcessor;
import cz.cvut.kbss.jsonld.deserialization.util.DataTypeTransformer;
import cz.cvut.kbss.jsonld.exception.JsonLdDeserializationException;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
class InstanceContext<T> {
private final T instance;
private final Map<String, Field> fieldMap;
private final Map<String, Object> knownInstances;
InstanceContext(T instance, Map<String, Object> knownInstances) {
this.instance = instance;
this.knownInstances = knownInstances;
this.fieldMap = Collections.emptyMap();
}
InstanceContext(T instance, Map<String, Field> fieldMap, Map<String, Object> knownInstances) {
this.instance = instance;
this.fieldMap = fieldMap;
this.knownInstances = knownInstances;
}
T getInstance() {
return instance;
}
Field getFieldForProperty(String property) {
// TODO Add handling of @Properties
return fieldMap.get(property);
}
void setFieldValue(Field field, Object value) {
assert !(instance instanceof Collection);
if (!field.getType().isAssignableFrom(value.getClass())) {
boolean success = trySettingReferenceToKnownInstance(field, value);
if (success) {
return;
}
success = tryTypeTransformation(field, value);
if (success) {
return;
}
throw valueTypeMismatch(value, field);
}
BeanClassProcessor.setFieldValue(field, instance, value);
}
private JsonLdDeserializationException valueTypeMismatch(Object value, Field field) {
return new JsonLdDeserializationException(
"Type mismatch. Cannot set value " + value + " of type " + value.getClass() + " on field " + field);
}
private boolean trySettingReferenceToKnownInstance(Field field, Object value) {
if (!BeanAnnotationProcessor.isObjectProperty(field) || !knownInstances.containsKey(value.toString())) {
return false;
}
final Object knownInstance = knownInstances.get(value.toString());
if (!field.getType().isAssignableFrom(knownInstance.getClass())) {
// Throw the exception right here so that it contains info about the known instance's type
throw valueTypeMismatch(knownInstance, field);
}
BeanClassProcessor.setFieldValue(field, instance, knownInstance);
return true;
}
private boolean tryTypeTransformation(Field field, Object value) {
final Class<?> targetType = field.getType();
final Object transformedValue = DataTypeTransformer.transformValue(value, targetType);
if (transformedValue != null) {
BeanClassProcessor.setFieldValue(field, instance, transformedValue);
return true;
}
return false;
}
/**
* Adds the specified item to this instance, if it is a collection.
*
* @param item The item to add
* @throws JsonLdDeserializationException When this instance is not a collection
*/
void addItem(Object item) {
if (!(instance instanceof Collection)) {
throw new JsonLdDeserializationException("The current instance " + instance + " is not a Collection.");
}
((Collection) instance).add(item);
}
}