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.util.externalizer;
023
024import java.io.IOException;
025import java.io.ObjectInput;
026import java.io.ObjectOutput;
027import java.util.LinkedHashMap;
028import java.util.Map;
029import java.util.Map.Entry;
030
031public class MapExternalizer extends DefaultExternalizer {
032
033    @Override
034    public int accept(Class<?> clazz) {
035        return Map.class.isAssignableFrom(clazz) ? 1 : -1;
036    }
037
038    @Override
039    public void readExternal(Object o, ObjectInput in) throws IOException, ClassNotFoundException, IllegalAccessException {
040        @SuppressWarnings("unchecked")
041                Map<Object, Object> map = (Map<Object, Object>)o;
042        int size = in.readInt();
043        for (int i = 0; i < size; i++) {
044                Object key = in.readObject();
045                Object value = in.readObject();
046                map.put(key, value);
047        }
048    }
049
050    @Override
051    public void writeExternal(Object o, ObjectOutput out) throws IOException, IllegalAccessException {
052        // Copy the map to limit the possibility of concurrent modification exceptions
053        // use a LinkedHashMap to keep order of elements
054        @SuppressWarnings("unchecked")
055                Map<Object, Object> map = new LinkedHashMap<Object, Object>((Map<Object, Object>)o);
056        out.writeInt(map.size());
057        for (Entry<Object, Object> entry : map.entrySet()) {
058                out.writeObject(entry.getKey());
059                out.writeObject(entry.getValue());
060        }
061    }
062}