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;
026
027import org.granite.messaging.jmf.DumpContext;
028import org.granite.messaging.jmf.InputContext;
029import org.granite.messaging.jmf.OutputContext;
030import org.granite.messaging.jmf.codec.std.LongCodec;
031import org.granite.messaging.jmf.codec.std.impl.util.LongUtil;
032
033/**
034 * @author Franck WOLFF
035 */
036public class LongCodecImpl extends AbstractStandardCodec<Long> implements LongCodec {
037
038        protected static final int LENGTH_BYTE_COUNT_OFFSET = 4;
039        
040        public int getObjectType() {
041                return JMF_LONG_OBJECT;
042        }
043
044        public Class<?> getObjectClass() {
045                return Long.class;
046        }
047
048        public int getPrimitiveType() {
049                return JMF_LONG;
050        }
051
052        public Class<?> getPrimitiveClass() {
053                return long.class;
054        }
055
056        public void encode(OutputContext ctx, Long v) throws IOException {
057                writeLongData(ctx, JMF_LONG_OBJECT, v.longValue());
058        }
059        
060        public Long decode(InputContext ctx, int parameterizedJmfType) throws IOException {
061                return Long.valueOf(readLongData(ctx, parameterizedJmfType));
062        }
063
064        public void encodePrimitive(OutputContext ctx, long v) throws IOException {
065                writeLongData(ctx, JMF_LONG, v);
066        }
067        
068        public long decodePrimitive(InputContext ctx) throws IOException {
069                int parameterizedJmfType = ctx.safeRead();
070                return readLongData(ctx, parameterizedJmfType);
071        }
072        
073        public void dump(DumpContext ctx, int parameterizedJmfType) throws IOException {
074                int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
075                
076                switch (jmfType) {
077                case JMF_LONG:
078                        ctx.indentPrintLn("long: " + readLongData(ctx, parameterizedJmfType));
079                        break;
080                case JMF_LONG_OBJECT:
081                        ctx.indentPrintLn(Long.class.getName() + ": " + Long.valueOf(readLongData(ctx, parameterizedJmfType)));
082                        break;
083                default:
084                        throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
085                }
086        }
087
088        protected void writeLongData(OutputContext ctx, int jmfType, long v) throws IOException {
089                final OutputStream os = ctx.getOutputStream();
090
091                int opposite = 0x00;
092                if (v < 0 && v != Long.MIN_VALUE) {
093                        opposite = 0x80;
094                        v = -v;
095                }
096                
097                int count = LongUtil.significantLongBytesCount0(v);
098                os.write(opposite | (count << LENGTH_BYTE_COUNT_OFFSET) | jmfType);
099                LongUtil.encodeLong(ctx, v, count);
100        }
101        
102        protected long readLongData(InputContext ctx, int parameterizedJmfType) throws IOException {
103                long v = LongUtil.decodeLong(ctx, (parameterizedJmfType >>> LENGTH_BYTE_COUNT_OFFSET) & 0x07);
104                if ((parameterizedJmfType & 0x80) != 0)
105                        v = -v;
106                return v;
107        }
108}