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.jmf.codec.std.impl;
023
024import java.io.IOException;
025
026import org.granite.messaging.jmf.DumpContext;
027import org.granite.messaging.jmf.InputContext;
028import org.granite.messaging.jmf.JMFEncodingException;
029import org.granite.messaging.jmf.OutputContext;
030import org.granite.messaging.jmf.codec.std.NullCodec;
031
032/**
033 * @author Franck WOLFF
034 */
035public class NullCodecImpl extends AbstractStandardCodec<Object> implements NullCodec {
036
037        public int getObjectType() {
038                return JMF_NULL;
039        }
040
041        public Class<?> getObjectClass() {
042                return null;
043        }
044
045        public void encode(OutputContext ctx, Object v) throws IOException {
046                if (v != null)
047                        throw new JMFEncodingException("Null value must be null");
048                
049                ctx.getOutputStream().write(JMF_NULL);
050        }
051        
052        public Object decode(InputContext ctx, int parameterizedJmfType) throws IOException {
053                int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
054                
055                if (jmfType != JMF_NULL)
056                        throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
057                
058                return null;
059        }
060        
061        public void dump(DumpContext ctx, int parameterizedJmfType) throws IOException {
062                int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
063                
064                if (jmfType != JMF_NULL)
065                        throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
066
067                ctx.indentPrintLn("?: null");
068        }
069}