customcollectiontype.java

hibernate-distribution-3.3.1.GA-dist.zip源码

/*
 * 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.type;

import java.io.Serializable;
import java.util.Iterator;
import java.util.Map;

import org.hibernate.HibernateException;
import org.hibernate.MappingException;
import org.hibernate.collection.PersistentCollection;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.usertype.UserCollectionType;
import org.hibernate.usertype.LoggableUserType;

/**
 * A custom type for mapping user-written classes that implement <tt>PersistentCollection</tt>
 * 
 * @see org.hibernate.collection.PersistentCollection
 * @see org.hibernate.usertype.UserCollectionType
 * @author Gavin King
 */
public class CustomCollectionType extends CollectionType {

	private final UserCollectionType userType;
	private final boolean customLogging;

	public CustomCollectionType(Class userTypeClass, String role, String foreignKeyPropertyName, boolean isEmbeddedInXML) {
		super(role, foreignKeyPropertyName, isEmbeddedInXML);

		if ( !UserCollectionType.class.isAssignableFrom( userTypeClass ) ) {
			throw new MappingException( "Custom type does not implement UserCollectionType: " + userTypeClass.getName() );
		}

		try {
			userType = ( UserCollectionType ) userTypeClass.newInstance();
		}
		catch ( InstantiationException ie ) {
			throw new MappingException( "Cannot instantiate custom type: " + userTypeClass.getName() );
		}
		catch ( IllegalAccessException iae ) {
			throw new MappingException( "IllegalAccessException trying to instantiate custom type: " + userTypeClass.getName() );
		}

		customLogging = LoggableUserType.class.isAssignableFrom( userTypeClass );
	}

	public PersistentCollection instantiate(SessionImplementor session, CollectionPersister persister, Serializable key)
	throws HibernateException {
		return userType.instantiate(session, persister);
	}

	public PersistentCollection wrap(SessionImplementor session, Object collection) {
		return userType.wrap(session, collection);
	}

	public Class getReturnedClass() {
		return userType.instantiate( -1 ).getClass();
	}

	public Object instantiate(int anticipatedType) {
		return userType.instantiate( anticipatedType );
	}

	public Iterator getElementsIterator(Object collection) {
		return userType.getElementsIterator(collection);
	}
	public boolean contains(Object collection, Object entity, SessionImplementor session) {
		return userType.contains(collection, entity);
	}
	public Object indexOf(Object collection, Object entity) {
		return userType.indexOf(collection, entity);
	}

	public Object replaceElements(Object original, Object target, Object owner, Map copyCache, SessionImplementor session)
	throws HibernateException {
		CollectionPersister cp = session.getFactory().getCollectionPersister( getRole() );
		return userType.replaceElements(original, target, cp, owner, copyCache, session);
	}

	protected String renderLoggableString(Object value, SessionFactoryImplementor factory) throws HibernateException {
		if ( customLogging ) {
			return ( ( LoggableUserType ) userType ).toLoggableString( value, factory );
		}
		else {
			return super.renderLoggableString( value, factory );
		}
	}

	public UserCollectionType getUserType() {
		return userType;
	}
}