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 */
022 package org.granite.messaging.jmf.codec.std.impl;
023
024 import java.io.IOException;
025 import java.io.OutputStream;
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.ShortCodec;
031
032 /**
033 * @author Franck WOLFF
034 */
035 public class ShortCodecImpl extends AbstractStandardCodec<Short> implements ShortCodec {
036
037 public int getObjectType() {
038 return JMF_SHORT_OBJECT;
039 }
040
041 public Class<?> getObjectClass() {
042 return Short.class;
043 }
044
045 public int getPrimitiveType() {
046 return JMF_SHORT;
047 }
048
049 public Class<?> getPrimitiveClass() {
050 return Short.TYPE;
051 }
052
053 public void encode(OutputContext ctx, Short v) throws IOException {
054 writeShortData(ctx, JMF_SHORT_OBJECT, v.intValue());
055 }
056
057 public Short decode(InputContext ctx, int parameterizedJmfType) throws IOException {
058 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
059
060 if (jmfType != JMF_SHORT_OBJECT)
061 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
062
063 return Short.valueOf(readShortData(ctx, parameterizedJmfType));
064 }
065
066 public void encodePrimitive(OutputContext ctx, int v) throws IOException {
067 writeShortData(ctx, JMF_SHORT, v);
068 }
069
070 public short decodePrimitive(InputContext ctx) throws IOException {
071 int parameterizedJmfType = ctx.safeRead();
072 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
073
074 if (jmfType != JMF_SHORT)
075 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
076
077 return readShortData(ctx, parameterizedJmfType);
078 }
079
080 public void dump(DumpContext ctx, int parameterizedJmfType) throws IOException {
081 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
082
083 switch (jmfType) {
084 case JMF_SHORT:
085 ctx.indentPrintLn("short: " + readShortData(ctx, parameterizedJmfType));
086 break;
087 case JMF_SHORT_OBJECT:
088 ctx.indentPrintLn(Short.class.getName() + ": " + Short.valueOf(readShortData(ctx, parameterizedJmfType)));
089 break;
090 default:
091 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
092 }
093 }
094
095 public void writeShortData(OutputContext ctx, int jmfType, int v) throws IOException {
096 final OutputStream os = ctx.getOutputStream();
097
098 if (v == Short.MIN_VALUE) {
099 os.write(0x40 | jmfType);
100 os.write(v >> 8);
101 os.write(v);
102 }
103 else {
104 int s = 0x00;
105 int a = v;
106 if (v < 0) {
107 a = -v;
108 s = 0x80;
109 }
110
111 if (a <= 0xFF) {
112 os.write(s | jmfType);
113 os.write(a);
114 }
115 else {
116 os.write(s | 0x40 | jmfType);
117 os.write(a >> 8);
118 os.write(a);
119 }
120 }
121 }
122
123 public short readShortData(InputContext ctx, int parameterizedJmfType) throws IOException {
124 short v = (short)ctx.safeRead();
125
126 if ((parameterizedJmfType & 0x40) != 0)
127 v = (short)((v << 8) | ctx.safeRead());
128
129 if ((parameterizedJmfType & 0x80) != 0)
130 v = (short)-v;
131
132 return v;
133 }
134 }