cdmlib-model/src/main/java/eu/etaxonomy/cdm/hibernate/HibernateProxyHelper.java

   1 /**
   2 * Copyright (C) 2007 EDIT
   3 * European Distributed Institute of Taxonomy
   4 * http://www.e-taxonomy.eu
   5 *
   6 * The contents of this file are subject to the Mozilla Public License Version 1.1
   7 * See LICENSE.TXT at the top of this package for the full license terms.
   8 */
   9
  10 package eu.etaxonomy.cdm.hibernate;
  11
  12 import org.apache.log4j.Logger;
  13 import org.hibernate.proxy.HibernateProxy;
  14 import org.hibernate.proxy.LazyInitializer;
  15
  16 /**
  17  * @author a.mueller
  18  * @created 03.03.2009
  19  * @version 1.0
  20  */
  21 public class HibernateProxyHelper {
  22         @SuppressWarnings("unused")
  23         private static final Logger logger = Logger.getLogger(HibernateProxyHelper.class);
  24
  25
  26         // ************************** Hibernate proxies *******************/
  27         /* (non-Javadoc)
  28          * @see eu.etaxonomy.cdm.model.common.IProxyHelper#deproxy(java.lang.Object, java.lang.Class)
  29          */
  30          public static <T> T deproxy(Object object, Class<T> clazz) throws ClassCastException {
  31              if (object instanceof HibernateProxy) {
  32                  return clazz.cast(((HibernateProxy) object).getHibernateLazyInitializer().getImplementation());
  33              } else {
  34                  return clazz.cast(object);
  35              }
  36          }
  37
  38                 /**
  39                  * Unwrap the target instance from the proxy.
  40                  */
  41                 public static Object deproxy(Object object){
  42                         if(object instanceof HibernateProxy) {
  43                                 LazyInitializer lazyInitializer = ((HibernateProxy)object).getHibernateLazyInitializer();
  44                                 return lazyInitializer.getImplementation();
  45                         } else {
  46                                 return object;
  47                         }
  48                 }
  49
  50          /* (non-Javadoc)
  51          * @see eu.etaxonomy.cdm.model.common.IProxyHelper#isInstanceOf(java.lang.Object, java.lang.Class)
  52          */
  53         public static boolean isInstanceOf(Object object, Class clazz) throws ClassCastException {
  54              if (clazz == null){
  55                  return false;
  56              }
  57                  if (object instanceof HibernateProxy) {
  58                  Object impl =  ((HibernateProxy) object).getHibernateLazyInitializer().getImplementation();
  59                  Class implClass = impl.getClass();
  60                  return clazz.isAssignableFrom(implClass);
  61              } else {
  62                  return clazz.isAssignableFrom(object.getClass());
  63              }
  64          }
  65
  66         /**
  67          * Get the class of an instance or the underlying class
  68          * of a proxy (without initializing the proxy!). It is
  69          * almost always better to use the entity name!
  70          *
  71          * delegates calls to {@link org.hibernate.proxy.HibernateProxyHelper}
  72          */
  73         public static Class getClassWithoutInitializingProxy(Object object) {
  74                 return org.hibernate.proxy.HibernateProxyHelper.getClassWithoutInitializingProxy(object);
  75         }
  76 }