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.IntegerCodec;
031
032 /**
033 * @author Franck WOLFF
034 */
035 public class IntegerCodecImpl extends AbstractIntegerStringCodec<Integer> implements IntegerCodec {
036
037 public int getObjectType() {
038 return JMF_INTEGER_OBJECT;
039 }
040
041 public Class<?> getObjectClass() {
042 return Integer.class;
043 }
044
045 public int getPrimitiveType() {
046 return JMF_INTEGER;
047 }
048
049 public Class<?> getPrimitiveClass() {
050 return Integer.TYPE;
051 }
052
053 public void encode(OutputContext ctx, Integer v) throws IOException {
054 writeIntData(ctx, JMF_INTEGER_OBJECT, v.intValue());
055 }
056
057 public Integer decode(InputContext ctx, int parameterizedJmfType) throws IOException {
058 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
059
060 if (jmfType != JMF_INTEGER_OBJECT)
061 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
062
063 return Integer.valueOf(readIntData(ctx, parameterizedJmfType));
064 }
065
066 public void encodePrimitive(OutputContext ctx, int v) throws IOException {
067 writeIntData(ctx, JMF_INTEGER, v);
068 }
069
070 public int decodePrimitive(InputContext ctx) throws IOException {
071 int parameterizedJmfType = ctx.safeRead();
072 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
073
074 if (jmfType != JMF_INTEGER)
075 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
076
077 return readIntData(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_INTEGER:
085 ctx.indentPrintLn("int: " + readIntData(ctx, parameterizedJmfType));
086 break;
087 case JMF_INTEGER_OBJECT:
088 ctx.indentPrintLn(Integer.class.getName() + ": " + Integer.valueOf(readIntData(ctx, parameterizedJmfType)));
089 break;
090 default:
091 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
092 }
093 }
094
095 protected void writeIntData(OutputContext ctx, int jmfType, int v) throws IOException {
096 IntegerComponents ics = intComponents(v);
097 ctx.getOutputStream().write((ics.sign << 7) | (ics.length << 5) | jmfType);
098 writeIntData(ctx, ics);
099 }
100
101 protected int readIntData(InputContext ctx, int parameterizedJmfType) throws IOException {
102 return readIntData(ctx, (parameterizedJmfType >> 5) & 0x03, (parameterizedJmfType & 0x80) != 0);
103 }
104
105 public void writeVariableInt(OutputContext ctx, int v) throws IOException {
106
107 final OutputStream os = ctx.getOutputStream();
108
109 if (v == Integer.MIN_VALUE)
110 os.write(0x80); // negative 0.
111 else {
112 int sign = 0x00;
113 if (v < 0) {
114 sign = 0x80;
115 v = -v;
116 }
117
118 int bytesCount = lengthOfVariableAbsoluteInt(v);
119 v -= deltaForVariableAbsoluteIntLength(bytesCount);
120
121 switch (bytesCount) {
122 case 0:
123 os.write(sign | v);
124 break;
125 case 1: case 2: case 3:
126 os.write(sign | 0x40 | (v >> (bytesCount * 7)));
127 for (int i = bytesCount - 1; i > 0; i--)
128 os.write(0x80 | (v >> (i * 7)));
129 os.write(0x7F & v);
130 break;
131 case 4:
132 os.write(sign | 0x40 | (v >> 29));
133 os.write(0x80 | (v >> 22));
134 os.write(0x80 | (v >> 15));
135 os.write(0x80 | (v >> 8));
136 os.write(v);
137 break;
138 }
139 }
140 }
141
142 public int readVariableInt(InputContext ctx) throws IOException {
143 int v = ctx.safeRead();
144
145 if (v == 0x80)
146 v = Integer.MIN_VALUE;
147 else {
148 boolean opposite = ((v & 0x80) != 0);
149 boolean readNext = (v & 0x40) != 0;
150
151 v &= 0x3F;
152
153 if (readNext) {
154 int l = 1;
155 for (int i = 1; i <= 3; i++) {
156 int u = ctx.safeRead();
157 v = (v << 7) | (u & 0x7F);
158 if ((u & 0x80) == 0) {
159 readNext = false;
160 break;
161 }
162 l++;
163 }
164 if (readNext)
165 v = (v << 8) | ctx.safeRead();
166 v += deltaForVariableAbsoluteIntLength(l);
167 }
168
169 if (opposite)
170 v = -v;
171 }
172
173 return v;
174 }
175
176 protected static final int[] VARIABLE_INT_DELTAS = new int[5];
177 static {
178 VARIABLE_INT_DELTAS[0] = 0;
179 for (int i = 1; i < VARIABLE_INT_DELTAS.length; i++)
180 VARIABLE_INT_DELTAS[i] = (VARIABLE_INT_DELTAS[i-1] << 7) | 0x40;
181 }
182
183 protected static int lengthOfVariableAbsoluteInt(int abs) {
184 for (int i = 1; i < VARIABLE_INT_DELTAS.length; i++) {
185 if (abs < VARIABLE_INT_DELTAS[i])
186 return (i - 1);
187 }
188 return 4;
189 }
190
191 protected static int deltaForVariableAbsoluteIntLength(int len) {
192 return VARIABLE_INT_DELTAS[len];
193 }
194 }