001    /*
002      GRANITE DATA SERVICES
003      Copyright (C) 2007-2010 ADEQUATE SYSTEMS SARL
004    
005      This file is part of Granite Data Services.
006    
007      Granite Data Services is free software; you can redistribute it and/or modify
008      it under the terms of the GNU Library General Public License as published by
009      the Free Software Foundation; either version 2 of the License, or (at your
010      option) any later version.
011    
012      Granite Data Services is distributed in the hope that it will be useful, but
013      WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014      FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015      for more details.
016    
017      You should have received a copy of the GNU Library General Public License
018      along with this library; if not, see <http://www.gnu.org/licenses/>.
019    */
020    
021    package org.granite.datanucleus;
022    
023    import java.util.Map;
024    
025    import javax.jdo.spi.Detachable;
026    import javax.jdo.spi.PersistenceCapable;
027    
028    import org.datanucleus.sco.SCOContainer;
029    import org.granite.logging.Logger;
030    import org.granite.messaging.amf.io.util.DefaultClassGetter;
031    
032    /**
033     * @author William DRAI
034     */
035    public class DataNucleusClassGetter extends DefaultClassGetter {
036    
037        public final static Logger log = Logger.getLogger(DataNucleusClassGetter.class);
038    
039        @Override
040        public Class<?> getClass(Object o) {
041            // Nothing special here: DataNucleus uses bytecode enhancement
042            return super.getClass(o);
043        }
044        
045        @Override
046        public boolean isEntity(Object o) {
047            return o instanceof PersistenceCapable;    
048        }
049        
050        
051        @Override
052        public boolean isInitialized(Object owner, String propertyName, Object propertyValue) {
053            if (propertyValue instanceof SCOContainer)
054                    return ((SCOContainer)propertyValue).isLoaded();
055            
056            if (propertyValue != null || !(owner instanceof PersistenceCapable))
057                    return true;
058            Map<String, Boolean> loadedState = DataNucleusExternalizer.getLoadedState((Detachable)owner, getClass(owner));
059            return loadedState.containsKey(propertyName) && loadedState.get(propertyName);
060        }
061        
062        @Override
063        public void initialize(Object owner, String propertyName, Object propertyValue) {
064            if (propertyValue instanceof SCOContainer)
065                    ((SCOContainer)propertyValue).load();
066            else if (propertyValue != null)
067                    propertyValue.toString();
068        }
069    }