/* Copyright 2004-2005 Graeme Rocher
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.grails.orm.hibernate.proxy;

import org.hibernate.HibernateException;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.proxy.HibernateProxy;
import org.hibernate.proxy.ProxyFactory;
import org.hibernate.type.AbstractComponentType;

import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.Set;

/**
 * Hibernate's default proxying mechanism proxies Groovy's getMetaClass() method. To avoid this we customize the proxying 
 * creation proxy here and in #GroovyAwareJavassistLazyInitializer
 *
 * @author Graeme Rocher
 * @since 1.1.1
 *        <p/>
 *        Created: Apr 21, 2009
 */
public class GroovyAwareJavassistProxyFactory implements ProxyFactory, Serializable {

	protected static final Class[] NO_CLASSES = new Class[0];
	private Class persistentClass;
	private String entityName;
	private Class[] interfaces;
	private Method getIdentifierMethod;
	private Method setIdentifierMethod;
	private AbstractComponentType componentIdType;
	private Class factory;

	public void postInstantiate(
			final String entityName,
			final Class persistentClass,
	        final Set interfaces,
			final Method getIdentifierMethod,
	        final Method setIdentifierMethod,
			AbstractComponentType componentIdType) throws HibernateException {
		this.entityName = entityName;
		this.persistentClass = persistentClass;
		this.interfaces = (Class[]) interfaces.toArray(NO_CLASSES);
		this.getIdentifierMethod = getIdentifierMethod;
		this.setIdentifierMethod = setIdentifierMethod;
		this.componentIdType = componentIdType;
		factory = GroovyAwareJavassistLazyInitializer.getProxyFactory( persistentClass, this.interfaces );
	}

	public HibernateProxy getProxy(
			Serializable id,
	        SessionImplementor session) throws HibernateException {
		return GroovyAwareJavassistLazyInitializer.getProxy(
				factory,
		        entityName,
				persistentClass,
		        interfaces,
		        getIdentifierMethod,
				setIdentifierMethod,
		        componentIdType,
		        id,
		        session
		);
	}

}
