/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, 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.proxy.pojo;
import java.io.Serializable;
import java.lang.reflect.Method;
import org.hibernate.engine.spi.EntityKey;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.internal.util.MarkerObject;
import org.hibernate.proxy.AbstractLazyInitializer;
import org.hibernate.type.CompositeType;
/**
* Lazy initializer for POJOs
*
* @author Gavin King
*/
public abstract class BasicLazyInitializer extends AbstractLazyInitializer {
protected static final Object INVOKE_IMPLEMENTATION = new MarkerObject("INVOKE_IMPLEMENTATION");
protected final Class persistentClass;
protected final Method getIdentifierMethod;
protected final Method setIdentifierMethod;
protected final boolean overridesEquals;
protected final CompositeType componentIdType;
private Object replacement;
protected BasicLazyInitializer(
String entityName,
Class persistentClass,
Serializable id,
Method getIdentifierMethod,
Method setIdentifierMethod,
CompositeType componentIdType,
SessionImplementor session,
boolean overridesEquals) {
super(entityName, id, session);
this.persistentClass = persistentClass;
this.getIdentifierMethod = getIdentifierMethod;
this.setIdentifierMethod = setIdentifierMethod;
this.componentIdType = componentIdType;
this.overridesEquals = overridesEquals;
}
protected abstract Object serializableProxy();
protected final Object invoke(Method method, Object[] args, Object proxy) throws Throwable {
String methodName = method.getName();
int params = args.length;
if ( params==0 ) {
if ( "writeReplace".equals(methodName) ) {
return getReplacement();
}
else if ( !overridesEquals && "hashCode".equals(methodName) ) {
return System.identityHashCode(proxy);
}
else if ( isUninitialized() && method.equals(getIdentifierMethod) ) {
return getIdentifier();
}
else if ( "getHibernateLazyInitializer".equals(methodName) ) {
return this;
}
}
else if ( params==1 ) {
if ( !overridesEquals && "equals".equals(methodName) ) {
return args[0]==proxy;
}
else if ( method.equals(setIdentifierMethod) ) {
initialize();
setIdentifier( (Serializable) args[0] );
return INVOKE_IMPLEMENTATION;
}
}
//if it is a property of an embedded component, invoke on the "identifier"
if ( componentIdType!=null && componentIdType.isMethodOf(method) ) {
return method.invoke( getIdentifier(), args );
}
// otherwise:
return INVOKE_IMPLEMENTATION;
}
private Object getReplacement() {
final SessionImplementor session = getSession();
if ( isUninitialized() && session != null && session.isOpen()) {
final EntityKey key = session.generateEntityKey(
getIdentifier(),
session.getFactory().getEntityPersister( getEntityName() )
);
final Object entity = session.getPersistenceContext().getEntity(key);
if (entity!=null) setImplementation( entity );
}
if ( isUninitialized() ) {
if (replacement==null) {
replacement = serializableProxy();
}
return replacement;
}
else {
return getTarget();
}
}
public final Class getPersistentClass() {
return persistentClass;
}
}