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HibernateProxyHandler.java
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HibernateProxyHandler.java
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/*
* Copyright 2004-2008 the original author or authors.
*
* 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.grails.orm.hibernate.proxy;
import java.io.Serializable;
import org.grails.datastore.gorm.GormEnhancer;
import org.grails.datastore.mapping.core.Session;
import org.grails.datastore.mapping.engine.AssociationQueryExecutor;
import org.grails.datastore.mapping.model.PersistentEntity;
import org.grails.datastore.mapping.proxy.ProxyFactory;
import org.grails.datastore.mapping.proxy.ProxyHandler;
import org.grails.datastore.mapping.reflect.ClassPropertyFetcher;
import org.hibernate.Hibernate;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.proxy.HibernateProxy;
import org.hibernate.proxy.HibernateProxyHelper;
/**
* Implementation of the ProxyHandler interface for Hibernate using org.hibernate.Hibernate
* and HibernateProxyHelper where possible.
*
* @author Graeme Rocher
* @since 1.2.2
*/
public class HibernateProxyHandler implements ProxyHandler, ProxyFactory {
/**
* Check if the proxy or persistent collection is initialized.
* @inheritDoc
*/
@Override
public boolean isInitialized(Object o) {
return Hibernate.isInitialized(o);
}
/**
* Check if an association proxy or persistent collection is initialized.
* @inheritDoc
*/
@Override
public boolean isInitialized(Object obj, String associationName) {
try {
Object proxy = ClassPropertyFetcher.getInstancePropertyValue(obj, associationName);
return isInitialized(proxy);
}
catch (RuntimeException e) {
return false;
}
}
/**
* Unproxies a HibernateProxy. If the proxy is uninitialized, it automatically triggers an initialization.
* In case the supplied object is null or not a proxy, the object will be returned as-is.
* @inheritDoc
* @see Hibernate#unproxy
*/
@Override
public Object unwrap(Object object) {
if (object instanceof PersistentCollection) {
initialize(object);
return object;
}
return Hibernate.unproxy(object);
}
/**
* @inheritDoc
* @see org.hibernate.proxy.AbstractLazyInitializer#getIdentifier
*/
@Override
public Serializable getIdentifier(Object o) {
if (o instanceof HibernateProxy) {
return ((HibernateProxy)o).getHibernateLazyInitializer().getIdentifier();
}
else {
//TODO seems we can get the id here if its has normal getId
// PersistentEntity persistentEntity = GormEnhancer.findStaticApi(o.getClass()).getGormPersistentEntity();
// return persistentEntity.getMappingContext().getEntityReflector(persistentEntity).getIdentifier(o);
return null;
}
}
/**
* @inheritDoc
* @see HibernateProxyHelper#getClassWithoutInitializingProxy
*/
@Override
public Class<?> getProxiedClass(Object o) {
return HibernateProxyHelper.getClassWithoutInitializingProxy(o);
}
/**
* calls unwrap which calls unproxy
* @see #unwrap(Object)
* @deprecated use unwrap
*/
@Deprecated
public Object unwrapIfProxy(Object instance) {
return unwrap(instance);
}
/**
* @inheritDoc
*/
@Override
public boolean isProxy(Object o) {
return (o instanceof HibernateProxy) || (o instanceof PersistentCollection);
}
/**
* Force initialization of a proxy or persistent collection.
* @inheritDoc
*/
@Override
public void initialize(Object o) {
Hibernate.initialize(o);
}
@Override
public <T> T createProxy(Session session, Class<T> type, Serializable key) {
throw new UnsupportedOperationException("createProxy not supported in HibernateProxyHandler");
}
@Override
public <T, K extends Serializable> T createProxy(Session session, AssociationQueryExecutor<K, T> executor, K associationKey) {
throw new UnsupportedOperationException("createProxy not supported in HibernateProxyHandler");
}
/**
* @deprecated use unwrap
*/
@Deprecated
public Object unwrapProxy(Object proxy) {
return unwrap(proxy);
}
/**
* returns the proxy for an association. returns null if its not a proxy.
* Note: Only used in a test. Deprecate?
*/
public HibernateProxy getAssociationProxy(Object obj, String associationName) {
try {
Object proxy = ClassPropertyFetcher.getInstancePropertyValue(obj, associationName);
if (proxy instanceof HibernateProxy) {
return (HibernateProxy) proxy;
}
return null;
}
catch (RuntimeException e) {
return null;
}
}
}