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    import java.io.OutputStream;
025    import java.math.BigInteger;
026    
027    import org.granite.messaging.jmf.DumpContext;
028    import org.granite.messaging.jmf.InputContext;
029    import org.granite.messaging.jmf.OutputContext;
030    import org.granite.messaging.jmf.codec.std.BigIntegerCodec;
031    
032    /**
033     * @author Franck WOLFF
034     */
035    public class BigIntegerCodecImpl extends AbstractIntegerStringCodec<BigInteger> implements BigIntegerCodec {
036    
037            public int getObjectType() {
038                    return JMF_BIG_INTEGER;
039            }
040    
041            public Class<?> getObjectClass() {
042                    return BigInteger.class;
043            }
044    
045            public void encode(OutputContext ctx, BigInteger v) throws IOException {
046                    final OutputStream os = ctx.getOutputStream();
047                    
048                    ctx.addToStoredObjects(v);
049                    
050                    byte[] magnitude = v.toByteArray();
051    
052                    IntegerComponents ics = intComponents(magnitude.length);
053                    os.write((ics.length << 6) | JMF_BIG_INTEGER);
054                    writeIntData(ctx, ics);
055                    
056                    os.write(magnitude);
057            }
058    
059            public BigInteger decode(InputContext ctx, int parameterizedJmfType) throws IOException {
060                    int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
061                    
062                    if (jmfType != JMF_BIG_INTEGER)
063                            throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
064                    
065                    int magnitudeLength = readIntData(ctx, (parameterizedJmfType >> 6) & 0x03, false);
066    
067                    byte[] magnitude = new byte[magnitudeLength];
068                    ctx.safeReadFully(magnitude);
069                    
070                    BigInteger v = new BigInteger(magnitude);
071                    
072                    if (BigInteger.ZERO.equals(v))
073                            v = BigInteger.ZERO;
074                    else if (BigInteger.ONE.equals(v))
075                            v = BigInteger.ONE;
076                    else if (BigInteger.TEN.equals(v))
077                            v = BigInteger.TEN;
078                    
079                    return v;
080            }
081    
082            public void dump(DumpContext ctx, int parameterizedJmfType) throws IOException {
083                    int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
084                    if (jmfType != JMF_BIG_INTEGER)
085                            throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
086                    ctx.indentPrintLn(BigInteger.class.getName() + ": " + decode(ctx, parameterizedJmfType));
087            }
088    }