org.hibernate.envers.internal.entities.mapper.relation.lazy.initializor.BasicCollectionInitializor Maven / Gradle / Ivy
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Hibernate's entity version (audit/history) support
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.envers.internal.entities.mapper.relation.lazy.initializor;
import java.lang.reflect.InvocationTargetException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.hibernate.envers.boot.internal.EnversService;
import org.hibernate.envers.exception.AuditException;
import org.hibernate.envers.internal.entities.mapper.relation.MiddleComponentData;
import org.hibernate.envers.internal.entities.mapper.relation.query.RelationQueryGenerator;
import org.hibernate.envers.internal.reader.AuditReaderImplementor;
import org.hibernate.internal.util.ReflectHelper;
/**
* Initializes a non-indexed java collection (set or list, eventually sorted).
*
* @author Adam Warski (adam at warski dot org)
*/
public class BasicCollectionInitializor extends AbstractCollectionInitializor {
protected final Class collectionClass;
private final MiddleComponentData elementComponentData;
public BasicCollectionInitializor(
EnversService enversService,
AuditReaderImplementor versionsReader,
RelationQueryGenerator queryGenerator,
Object primaryKey, Number revision, boolean removed,
Class collectionClass,
MiddleComponentData elementComponentData) {
super( enversService, versionsReader, queryGenerator, primaryKey, revision, removed );
this.collectionClass = collectionClass;
this.elementComponentData = elementComponentData;
}
@Override
@SuppressWarnings("unchecked")
protected T initializeCollection(int size) {
return AccessController.doPrivileged(
new PrivilegedAction() {
@Override
public T run() {
try {
return (T) ReflectHelper.getDefaultConstructor( collectionClass ).newInstance();
}
catch (InstantiationException e) {
throw new AuditException( e );
}
catch (IllegalAccessException e) {
throw new AuditException( e );
}
catch (InvocationTargetException e) {
throw new AuditException( e );
}
}
}
);
}
@Override
@SuppressWarnings({"unchecked"})
protected void addToCollection(T collection, Object collectionRow) {
// collectionRow will be the actual object if retrieved from audit relation or middle table
// otherwise it will be a List
Object elementData = collectionRow;
if ( collectionRow instanceof java.util.List ) {
elementData = ( (List) collectionRow ).get( elementComponentData.getComponentIndex() );
}
// If the target entity is not audited, the elements may be the entities already, so we have to check
// if they are maps or not.
Object element;
if ( elementData instanceof Map ) {
element = elementComponentData.getComponentMapper().mapToObjectFromFullMap(
entityInstantiator,
(Map) elementData, null, revision
);
}
else {
element = elementData;
}
collection.add( element );
}
}