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;
032import org.granite.messaging.jmf.codec.std.impl.util.IntegerUtil;
033
034/**
035 * @author Franck WOLFF
036 */
037public class BigIntegerCodecImpl extends AbstractStandardCodec<BigInteger> implements BigIntegerCodec {
038        
039        protected static final int LENGTH_BYTE_COUNT_OFFSET = 6;
040
041        public int getObjectType() {
042                return JMF_BIG_INTEGER;
043        }
044
045        public Class<?> getObjectClass() {
046                return BigInteger.class;
047        }
048
049        public void encode(OutputContext ctx, BigInteger v) throws IOException {
050                final OutputStream os = ctx.getOutputStream();
051                
052                byte[] magnitude = v.toByteArray();
053
054                int count = IntegerUtil.significantIntegerBytesCount0(magnitude.length);
055                os.write((count << LENGTH_BYTE_COUNT_OFFSET) | JMF_BIG_INTEGER);
056                IntegerUtil.encodeInteger(ctx, magnitude.length, count);
057                
058                os.write(magnitude);
059        }
060
061        public BigInteger decode(InputContext ctx, int parameterizedJmfType) throws IOException {
062                int magnitudeLength = IntegerUtil.decodeInteger(ctx, parameterizedJmfType >>> LENGTH_BYTE_COUNT_OFFSET);
063
064                byte[] magnitude = new byte[magnitudeLength];
065                ctx.safeReadFully(magnitude);
066                
067                BigInteger v = new BigInteger(magnitude);
068                
069                if (BigInteger.ZERO.equals(v))
070                        v = BigInteger.ZERO;
071                else if (BigInteger.ONE.equals(v))
072                        v = BigInteger.ONE;
073                else if (BigInteger.TEN.equals(v))
074                        v = BigInteger.TEN;
075                
076                return v;
077        }
078
079        public void dump(DumpContext ctx, int parameterizedJmfType) throws IOException {
080                int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
081                if (jmfType != JMF_BIG_INTEGER)
082                        throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
083                ctx.indentPrintLn(BigInteger.class.getName() + ": " + decode(ctx, parameterizedJmfType));
084        }
085}