001    /*
002      GRANITE DATA SERVICES
003      Copyright (C) 2011 GRANITE DATA SERVICES S.A.S.
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.tide.data;
022    
023    import javax.jdo.PersistenceManager;
024    import javax.jdo.PersistenceManagerFactory;
025    import javax.jdo.Transaction;
026    
027    import org.granite.tide.TideTransactionManager;
028    
029    /**
030     * Responsible for attaching a entity with the entity mangager
031     * @author William DRAI
032     *
033     */
034    public class JDOPersistenceManager extends AbstractTidePersistenceManager implements TideTransactionPersistenceManager {
035            
036            protected PersistenceManager pm;
037    
038            
039            public JDOPersistenceManager() {
040                    super(new JDOTransactionManager());
041            }
042    
043            public JDOPersistenceManager(PersistenceManagerFactory pmf) {
044                    this(pmf, null);
045            }
046            
047            public JDOPersistenceManager(PersistenceManagerFactory pmf, TideTransactionManager tm) {
048                    super(tm != null ? tm : new JDOTransactionManager());
049                    pm = pmf.getPersistenceManager();
050            }
051            
052            public Object getCurrentTransaction() {
053            Transaction t = pm.currentTransaction();
054            t.begin();
055            return t;
056            }
057            
058            @Override
059            public void close() {
060                    if (pm != null && !pm.isClosed())
061                            pm.close();
062            }
063            
064            
065        /**
066         * Finds the entity with the JDO persistence manager.
067         * @return the entity
068         */
069            @Override
070            public Object fetchEntity(Object entity, String[] fetch) {
071                    Object id = pm.getObjectId(entity);
072                    if (id == null)
073                            return null;
074                    
075                    return pm.getObjectById(id);
076            }
077    
078            
079            public static class JDOTransactionManager implements TideTransactionManager {
080                            
081                    public Object begin(TideTransactionPersistenceManager pm) {
082                            if (pm != null)
083                                    return pm.getCurrentTransaction();
084                            return null;
085                    }
086                    
087                    public void commit(Object t) throws Exception {
088                    ((Transaction)t).commit();
089                    }
090                    
091                    public void rollback(Object t) {
092                    ((Transaction)t).rollback();
093                    }
094            }
095    }