/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program 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 distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.envers.entities.mapper.relation.lazy.initializor;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.hibernate.envers.configuration.AuditConfiguration;
import org.hibernate.envers.entities.mapper.relation.MiddleComponentData;
import org.hibernate.envers.entities.mapper.relation.query.RelationQueryGenerator;
import org.hibernate.envers.exception.AuditException;
import org.hibernate.envers.reader.AuditReaderImplementor;
/**
* Initializes a non-indexed java collection (set or list, eventually sorted).
* @author Adam Warski (adam at warski dot org)
*/
public class BasicCollectionInitializor<T extends Collection> extends AbstractCollectionInitializor<T> {
protected final Class<? extends T> collectionClass;
private final MiddleComponentData elementComponentData;
public BasicCollectionInitializor(AuditConfiguration verCfg,
AuditReaderImplementor versionsReader,
RelationQueryGenerator queryGenerator,
Object primaryKey, Number revision,
Class<? extends T> collectionClass,
MiddleComponentData elementComponentData) {
super(verCfg, versionsReader, queryGenerator, primaryKey, revision);
this.collectionClass = collectionClass;
this.elementComponentData = elementComponentData;
}
protected T initializeCollection(int size) {
try {
return collectionClass.newInstance();
} catch (InstantiationException e) {
throw new AuditException(e);
} catch (IllegalAccessException e) {
throw new AuditException(e);
}
}
@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<String, Object>) elementData, null, revision);
} else {
element = elementData;
}
collection.add(element);
}
}