org.hibernate.envers.internal.entities.mapper.relation.lazy.initializor.BasicCollectionInitializor Maven / Gradle / Ivy

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Hibernate's entity version (audit/history) support
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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2013, Red Hat Inc. 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 Inc.
 *
 * 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.internal.entities.mapper.relation.lazy.initializor;

import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.List;
import java.util.Map;

import org.hibernate.envers.configuration.spi.AuditConfiguration;
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(
			AuditConfiguration verCfg,
			AuditReaderImplementor versionsReader,
			RelationQueryGenerator queryGenerator,
			Object primaryKey, Number revision, boolean removed,
			Class collectionClass,
			MiddleComponentData elementComponentData) {
		super( verCfg, versionsReader, queryGenerator, primaryKey, revision, removed );

		this.collectionClass = collectionClass;
		this.elementComponentData = elementComponentData;
	}

	@Override
	@SuppressWarnings("unchecked")
	protected T initializeCollection(int size) {
		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 );
	}
}