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