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;
025import java.io.OutputStream;
026import java.math.BigInteger;
027
028import org.granite.messaging.jmf.DumpContext;
029import org.granite.messaging.jmf.InputContext;
030import org.granite.messaging.jmf.OutputContext;
031import org.granite.messaging.jmf.codec.std.BigIntegerCodec;
032
033/**
034 * @author Franck WOLFF
035 */
036public class BigIntegerCodecImpl extends AbstractIntegerStringCodec<BigInteger> implements BigIntegerCodec {
037
038        public int getObjectType() {
039                return JMF_BIG_INTEGER;
040        }
041
042        public Class<?> getObjectClass() {
043                return BigInteger.class;
044        }
045
046        public void encode(OutputContext ctx, BigInteger v) throws IOException {
047                final OutputStream os = ctx.getOutputStream();
048                
049                ctx.addToStoredObjects(v);
050                
051                byte[] magnitude = v.toByteArray();
052
053                IntegerComponents ics = intComponents(magnitude.length);
054                os.write((ics.length << 6) | JMF_BIG_INTEGER);
055                writeIntData(ctx, ics);
056                
057                os.write(magnitude);
058        }
059
060        public BigInteger decode(InputContext ctx, int parameterizedJmfType) throws IOException {
061                int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
062                
063                if (jmfType != JMF_BIG_INTEGER)
064                        throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
065                
066                int magnitudeLength = readIntData(ctx, (parameterizedJmfType >> 6) & 0x03, false);
067
068                byte[] magnitude = new byte[magnitudeLength];
069                ctx.safeReadFully(magnitude);
070                
071                BigInteger v = new BigInteger(magnitude);
072                
073                if (BigInteger.ZERO.equals(v))
074                        v = BigInteger.ZERO;
075                else if (BigInteger.ONE.equals(v))
076                        v = BigInteger.ONE;
077                else if (BigInteger.TEN.equals(v))
078                        v = BigInteger.TEN;
079                
080                return v;
081        }
082
083        public void dump(DumpContext ctx, int parameterizedJmfType) throws IOException {
084                int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
085                if (jmfType != JMF_BIG_INTEGER)
086                        throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
087                ctx.indentPrintLn(BigInteger.class.getName() + ": " + decode(ctx, parameterizedJmfType));
088        }
089}