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     */
022    package org.granite.messaging.amf.io.convert.impl;
023    
024    import java.lang.reflect.Type;
025    
026    import org.granite.messaging.amf.io.convert.Converter;
027    import org.granite.messaging.amf.io.convert.Converters;
028    import org.granite.messaging.amf.io.convert.Reverter;
029    import org.granite.util.TypeUtil;
030    
031    import com.google.appengine.api.datastore.Key;
032    import com.google.appengine.api.datastore.KeyFactory;
033    
034    
035    public class GAEKeyConverter extends Converter implements Reverter {
036            
037            private static String KEY_CLASS = "com.google.appengine.api.datastore.Key";
038            
039        public GAEKeyConverter(Converters converters) {
040            super(converters);
041        }
042    
043            @Override
044            protected boolean internalCanConvert(Object value, Type targetType) {
045            Class<?> targetClass = TypeUtil.classOfType(targetType);
046            return (
047                targetClass != Object.class && KEY_CLASS.equals(targetClass.getName()) &&
048                (value instanceof String || value == null)
049            );
050            }
051    
052            @Override
053            protected Object internalConvert(Object value, Type targetType) {
054            if (value == null)
055                return null;
056            return KeyFactory.stringToKey((String)value);
057            }
058    
059            public boolean canRevert(Object value) {
060                    return value != null && KEY_CLASS.equals(value.getClass().getName());
061            }
062    
063            public Object revert(Object value) {
064                    return KeyFactory.keyToString((Key)value);
065            }
066    
067    }