001    /**
002     *   GRANITE DATA SERVICES
003     *   Copyright (C) 2006-2013 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    package org.granite.client.persistence.collection;
021    
022    import java.io.ObjectInput;
023    import java.util.HashMap;
024    import java.util.Map;
025    import java.util.SortedMap;
026    
027    import org.granite.messaging.persistence.PersistentCollectionSnapshot;
028    
029    /**
030     * @author Franck WOLFF
031     */
032    public class PersistentMap<K, V> extends AbstractPersistentMapCollection<K, V, Map<K, V>> implements Map<K, V> {
033    
034            public PersistentMap() {
035            }
036    
037            public PersistentMap(boolean initialized) {
038                    this(initialized ? new HashMap<K, V>() : null, false);
039            }
040    
041            public PersistentMap(Map<K, V> collection) {              
042                    this(collection, true);
043            }
044    
045            public PersistentMap(Map<K, V> collection, boolean clone) {       
046                    if (collection instanceof SortedMap)
047                            throw new IllegalArgumentException("Should not be a SortedMap: " + collection);
048                    
049                    if (collection != null)
050                            init(clone ? new HashMap<K, V>(collection) : collection, null, false);
051            }
052            
053            @Override
054            public void doInitialize() {
055                    init(new HashMap<K, V>(), null, false);
056            }
057    
058            @Override
059            protected PersistentCollectionSnapshot createSnapshot(Object io, boolean forReading) {
060                    PersistentCollectionSnapshotFactory factory = PersistentCollectionSnapshotFactory.newInstance(io);
061                    if (forReading || !wasInitialized())
062                            return factory.newPersistentCollectionSnapshot(getDetachedState());
063                    return factory.newPersistentCollectionSnapshot(true, getDetachedState(), isDirty(), this);
064            }
065    
066            @SuppressWarnings("unchecked")
067            @Override
068            protected void updateFromSnapshot(ObjectInput in, PersistentCollectionSnapshot snapshot) {
069                    if (snapshot.isInitialized())
070                            init(new HashMap<K, V>((Map<K, V>)snapshot.getElementsAsMap()), snapshot.getDetachedState(), snapshot.isDirty());
071                    else
072                            init(null, snapshot.getDetachedState(), false);
073            }
074            
075        public PersistentMap<K, V> clone(boolean uninitialize) {
076            PersistentMap<K, V> map = new PersistentMap<K, V>();
077            if (wasInitialized() && !uninitialize)
078                    map.init(getCollection(), null, isDirty());
079            return map;
080        }
081    }