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/**
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* Copyright (C) 2007 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.hibernate;
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import java.io.Serializable;
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import org.apache.log4j.Logger;
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import org.hibernate.Hibernate;
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import org.hibernate.HibernateException;
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import org.hibernate.proxy.HibernateProxy;
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/**
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* @author a.mueller
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* @since 03.03.2009
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*/
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public class HibernateProxyHelper {
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@SuppressWarnings("unused")
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private static final Logger logger = Logger.getLogger(HibernateProxyHelper.class);
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// ************************** Hibernate proxies *******************/
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/**
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* Deproxy and cast the given object to the given class.
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* If clazz is <code>null</code>. If object is not an instance of HibernateProxy no
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* deproxy is performed.
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*
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* @param object
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* @param clazz
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* @return the casted and deproxied object
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* @throws ClassCastException
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*/
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public static <T> T deproxy(Object object, Class<T> clazz) throws ClassCastException {
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if (object instanceof HibernateProxy) {
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object = ((HibernateProxy) object).getHibernateLazyInitializer().getImplementation();
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return clazz.cast(object);
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}
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if (clazz == null){
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return (T)object;
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}else {
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return clazz.cast(object);
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}
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}
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/**
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* Unwrap the target instance from the proxy.
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*
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* @throws org.hibernate.HibernateException
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*/
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public static <T> T deproxy(T entity){
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if (entity == null){
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return null;
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}
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if(entity instanceof HibernateProxy) {
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Hibernate.initialize(entity);
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entity = (T) ((HibernateProxy) entity).getHibernateLazyInitializer().getImplementation();
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}
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return entity;
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}
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/**
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* Unwrap the target instance from the proxy if possible otherwise return null.
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*
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* @param entity
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* @return the deproxied entity or null in case it was not initialized.
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*/
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public static <T> T deproxyOrNull(T entity){
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try{
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return deproxy(entity);
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} catch (HibernateException e) {
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return null;
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}
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}
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public static boolean isInstanceOf(Object object, Class clazz) throws ClassCastException {
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if (clazz == null || object == null){
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return false;
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}
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if (object instanceof HibernateProxy) {
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Object impl = ((HibernateProxy) object).getHibernateLazyInitializer().getImplementation();
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Class<?> implClass = impl.getClass();
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return clazz.isAssignableFrom(implClass);
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} else {
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return clazz.isAssignableFrom(object.getClass());
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}
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}
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public static Serializable getIdentifierOf(Object object) {
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if (object instanceof HibernateProxy) {
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return ((HibernateProxy) object).getHibernateLazyInitializer().getIdentifier();
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} else {
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throw new ClassCastException("Cannot cast the given Object to a known Hibernate proxy.");
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}
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}
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/**
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* Get the class of an instance or the underlying class
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* of a proxy (without initializing the proxy!). It is
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* almost always better to use the entity name!
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*
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* delegates calls to {@link org.hibernate.proxy.HibernateProxyHelper}
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*/
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public static Class getClassWithoutInitializingProxy(Object object) {
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return org.hibernate.proxy.HibernateProxyHelper.getClassWithoutInitializingProxy(object);
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}
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}
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