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------------------------------------------------------------
revno: 21612
committer: Morten Olav Hansen <mortenoh@xxxxxxxxx>
branch nick: dhis2
timestamp: Wed 2016-01-06 14:05:53 +0700
message:
  Added utility for checking if object is hibernate proxy, and unwrap proxy
added:
  dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/HibernateUtils.java


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=== added file 'dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/HibernateUtils.java'
--- dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/HibernateUtils.java	1970-01-01 00:00:00 +0000
+++ dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/HibernateUtils.java	2016-01-06 07:05:53 +0000
@@ -0,0 +1,82 @@
+package org.hisp.dhis.system.util;
+
+/*
+ * Copyright (c) 2004-2016, University of Oslo
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * Neither the name of the HISP project nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+import org.hibernate.Hibernate;
+import org.hibernate.collection.internal.PersistentSet;
+import org.hibernate.collection.spi.PersistentCollection;
+import org.hibernate.proxy.HibernateProxy;
+
+/**
+ * @author Morten Olav Hansen <mortenoh@xxxxxxxxx>
+ */
+public class HibernateUtils
+{
+    public static boolean isProxy( Object object )
+    {
+        return object != null && ((object instanceof HibernateProxy) || (object instanceof PersistentCollection));
+    }
+
+    /**
+     * If object is proxy, get unwrapped non-proxy object.
+     *
+     * @param proxy Object to check and unwrap
+     * @return Unwrapped object if proxyied, if not just returns same object
+     */
+    @SuppressWarnings( "unchecked" )
+    public static <T> T unwrap( T proxy )
+    {
+        if ( !isProxy( proxy ) )
+        {
+            return proxy;
+        }
+
+        Hibernate.initialize( proxy );
+
+        if ( HibernateProxy.class.isInstance( proxy ) )
+        {
+            return (T) ((HibernateProxy) proxy).getHibernateLazyInitializer().getImplementation();
+        }
+
+        if ( PersistentCollection.class.isInstance( proxy ) )
+        {
+            PersistentCollection persistentCollection = (PersistentCollection) proxy;
+
+            if ( !PersistentSet.class.isInstance( persistentCollection ) )
+            {
+                return (T) persistentCollection.getStoredSnapshot();
+            }
+
+            // for now just return same as for non-sets, but PersistentSets might require a bit of extra work.
+            return (T) persistentCollection.getStoredSnapshot();
+        }
+
+        return proxy;
+    }
+}