001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022package org.granite.tide.data;
023
024import javax.jdo.PersistenceManager;
025import javax.jdo.PersistenceManagerFactory;
026import javax.jdo.Transaction;
027
028import org.granite.tide.TideTransactionManager;
029
030/**
031 * Responsible for attaching a entity with the entity mangager
032 * @author William DRAI
033 *
034 */
035public class JDOPersistenceManager extends AbstractTidePersistenceManager implements TideTransactionPersistenceManager {
036        
037        protected PersistenceManager pm;
038
039        
040        public JDOPersistenceManager() {
041                super(new JDOTransactionManager());
042        }
043
044        public JDOPersistenceManager(PersistenceManagerFactory pmf) {
045                this(pmf, null);
046        }
047        
048        public JDOPersistenceManager(PersistenceManagerFactory pmf, TideTransactionManager tm) {
049                super(tm != null ? tm : new JDOTransactionManager());
050                pm = pmf.getPersistenceManager();
051        }
052        
053        public Object getCurrentTransaction() {
054        Transaction t = pm.currentTransaction();
055        t.begin();
056        return t;
057        }
058        
059        @Override
060        public void close() {
061                if (pm != null && !pm.isClosed())
062                        pm.close();
063        }
064        
065        
066    /**
067     * Finds the entity with the JDO persistence manager.
068     * @return the entity
069     */
070        @Override
071        public Object fetchEntity(Object entity, String[] fetch) {
072                Object id = pm.getObjectId(entity);
073                if (id == null)
074                        return null;
075                
076                return pm.getObjectById(id);
077        }
078
079        
080        public static class JDOTransactionManager implements TideTransactionManager {
081                        
082                public Object begin(TideTransactionPersistenceManager pm) {
083                        if (pm != null)
084                                return pm.getCurrentTransaction();
085                        return null;
086                }
087                
088                public void commit(Object t) throws Exception {
089                ((Transaction)t).commit();
090                }
091                
092                public void rollback(Object t) {
093                ((Transaction)t).rollback();
094                }
095        }
096}