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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.BeanClassProcessor;
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;
InstanceContext(T instance) {
this.instance = instance;
this.fieldMap = Collections.emptyMap();
}
InstanceContext(T instance, Map<String, Field> fieldMap) {
this.instance = instance;
this.fieldMap = fieldMap;
}
T getInstance() {
return instance;
}
Map<String, Field> getFieldMap() {
return fieldMap;
}
Field getFieldForProperty(String property) {
// TODO Add handling of @Properties
return fieldMap.get(property);
}
void setFieldValue(Field field, Object value) {
assert !(instance instanceof Collection);
// TODO Handle object references
if (!field.getType().isAssignableFrom(value.getClass())) {
throw new JsonLdDeserializationException(
"Type mismatch. Cannot set value " + value + " of type " + value.getClass() + " on field " + field);
}
BeanClassProcessor.setFieldValue(field, instance, value);
}
/**
* 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);
}
}