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.jmf.codec.std.impl;
023    
024    import java.io.IOException;
025    
026    import org.granite.messaging.jmf.DumpContext;
027    import org.granite.messaging.jmf.InputContext;
028    import org.granite.messaging.jmf.JMFEncodingException;
029    import org.granite.messaging.jmf.OutputContext;
030    import org.granite.messaging.jmf.codec.std.NullCodec;
031    
032    /**
033     * @author Franck WOLFF
034     */
035    public 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    }