001    /*
002      GRANITE DATA SERVICES
003      Copyright (C) 2013 GRANITE DATA SERVICES S.A.S.
004    
005      This file is part of Granite Data Services.
006    
007      Granite Data Services is free software; you can redistribute it and/or modify
008      it under the terms of the GNU Library General Public License as published by
009      the Free Software Foundation; either version 2 of the License, or (at your
010      option) any later version.
011    
012      Granite Data Services is distributed in the hope that it will be useful, but
013      WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014      FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015      for more details.
016    
017      You should have received a copy of the GNU Library General Public License
018      along with this library; if not, see <http://www.gnu.org/licenses/>.
019    */
020    
021    package org.granite.messaging.jmf.codec.std.impl;
022    
023    import java.io.IOException;
024    
025    import org.granite.messaging.jmf.DumpContext;
026    import org.granite.messaging.jmf.InputContext;
027    import org.granite.messaging.jmf.JMFEncodingException;
028    import org.granite.messaging.jmf.OutputContext;
029    import org.granite.messaging.jmf.codec.std.NullCodec;
030    
031    /**
032     * @author Franck WOLFF
033     */
034    public class NullCodecImpl extends AbstractStandardCodec<Object> implements NullCodec {
035    
036            public int getObjectType() {
037                    return JMF_NULL;
038            }
039    
040            public Class<?> getObjectClass() {
041                    return null;
042            }
043    
044            public void encode(OutputContext ctx, Object v) throws IOException {
045                    if (v != null)
046                            throw new JMFEncodingException("Null value must be null");
047                    
048                    ctx.getOutputStream().write(JMF_NULL);
049            }
050            
051            public Object decode(InputContext ctx, int parameterizedJmfType) throws IOException {
052                    int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
053                    
054                    if (jmfType != JMF_NULL)
055                            throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
056                    
057                    return null;
058            }
059            
060            public void dump(DumpContext ctx, int parameterizedJmfType) throws IOException {
061                    int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
062                    
063                    if (jmfType != JMF_NULL)
064                            throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
065    
066                    ctx.indentPrintLn("?: null");
067            }
068    }