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
026 import org.granite.messaging.jmf.DumpContext;
027 import org.granite.messaging.jmf.InputContext;
028 import org.granite.messaging.jmf.OutputContext;
029 import org.granite.messaging.jmf.codec.std.ShortCodec;
030
031 /**
032 * @author Franck WOLFF
033 */
034 public class ShortCodecImpl extends AbstractStandardCodec<Short> implements ShortCodec {
035
036 public int getObjectType() {
037 return JMF_SHORT_OBJECT;
038 }
039
040 public Class<?> getObjectClass() {
041 return Short.class;
042 }
043
044 public int getPrimitiveType() {
045 return JMF_SHORT;
046 }
047
048 public Class<?> getPrimitiveClass() {
049 return Short.TYPE;
050 }
051
052 public void encode(OutputContext ctx, Short v) throws IOException {
053 writeShortData(ctx, JMF_SHORT_OBJECT, v.intValue());
054 }
055
056 public Short decode(InputContext ctx, int parameterizedJmfType) throws IOException {
057 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
058
059 if (jmfType != JMF_SHORT_OBJECT)
060 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
061
062 return Short.valueOf(readShortData(ctx, parameterizedJmfType));
063 }
064
065 public void encodePrimitive(OutputContext ctx, int v) throws IOException {
066 writeShortData(ctx, JMF_SHORT, v);
067 }
068
069 public short decodePrimitive(InputContext ctx) throws IOException {
070 int parameterizedJmfType = ctx.safeRead();
071 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
072
073 if (jmfType != JMF_SHORT)
074 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
075
076 return readShortData(ctx, parameterizedJmfType);
077 }
078
079 public void dump(DumpContext ctx, int parameterizedJmfType) throws IOException {
080 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
081
082 switch (jmfType) {
083 case JMF_SHORT:
084 ctx.indentPrintLn("short: " + readShortData(ctx, parameterizedJmfType));
085 break;
086 case JMF_SHORT_OBJECT:
087 ctx.indentPrintLn(Short.class.getName() + ": " + Short.valueOf(readShortData(ctx, parameterizedJmfType)));
088 break;
089 default:
090 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
091 }
092 }
093
094 public void writeShortData(OutputContext ctx, int jmfType, int v) throws IOException {
095 final OutputStream os = ctx.getOutputStream();
096
097 if (v == Short.MIN_VALUE) {
098 os.write(0x40 | jmfType);
099 os.write(v >> 8);
100 os.write(v);
101 }
102 else {
103 int s = 0x00;
104 int a = v;
105 if (v < 0) {
106 a = -v;
107 s = 0x80;
108 }
109
110 if (a <= 0xFF) {
111 os.write(s | jmfType);
112 os.write(a);
113 }
114 else {
115 os.write(s | 0x40 | jmfType);
116 os.write(a >> 8);
117 os.write(a);
118 }
119 }
120 }
121
122 public short readShortData(InputContext ctx, int parameterizedJmfType) throws IOException {
123 short v = (short)ctx.safeRead();
124
125 if ((parameterizedJmfType & 0x40) != 0)
126 v = (short)((v << 8) | ctx.safeRead());
127
128 if ((parameterizedJmfType & 0x80) != 0)
129 v = (short)-v;
130
131 return v;
132 }
133 }