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.messaging.amf.io.convert.impl;
023
024import java.lang.reflect.Type;
025
026import org.granite.messaging.amf.io.convert.Converter;
027import org.granite.messaging.amf.io.convert.Converters;
028import org.granite.messaging.amf.io.convert.Reverter;
029import org.granite.util.TypeUtil;
030
031import com.google.appengine.api.datastore.Key;
032import com.google.appengine.api.datastore.KeyFactory;
033
034
035public 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}