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annotate src/org/tmatesoft/hg/internal/EncodingHelper.java @ 667:fba85bc1dfb8

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Refactoring: move all encoding/decoding operations into single place, EncodingHelper
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 11 Jul 2013 17:54:08 +0200
parents 47b7bedf0569
children f568330dd9c0
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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20
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21 import java.io.UnsupportedEncodingException;
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22 import java.nio.ByteBuffer;
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23 import java.nio.CharBuffer;
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24 import java.nio.charset.CharacterCodingException;
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25 import java.nio.charset.Charset;
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26 import java.nio.charset.CharsetDecoder;
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27 import java.nio.charset.CharsetEncoder;
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28
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29 import org.tmatesoft.hg.core.SessionContext;
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30 import org.tmatesoft.hg.repo.HgInvalidStateException;
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31
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32 /**
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33 * Keep all encoding-related issues in the single place
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34 * NOT thread-safe (encoder and decoder requires synchronized access)
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35 *
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36 * @see http://mercurial.selenic.com/wiki/EncodingStrategy
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37 * @see http://mercurial.selenic.com/wiki/WindowsUTF8Plan
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38 * @see http://mercurial.selenic.com/wiki/CharacterEncodingOnWindows
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 public class EncodingHelper {
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43 /*
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44 * To understand what Mercurial thinks of UTF-8 and Unix byte approach to names, see
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45 * http://mercurial.808500.n3.nabble.com/Unicode-support-request-td3430704.html
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46 */
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47
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48 private final SessionContext sessionContext;
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49 private final CharsetEncoder encoder;
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50 private final CharsetDecoder decoder;
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51 private final CharsetEncoder utfEncoder;
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52 private final CharsetDecoder utfDecoder;
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53
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54 EncodingHelper(Charset fsEncoding, SessionContext.Source ctx) {
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55 sessionContext = ctx.getSessionContext();
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56 decoder = fsEncoding.newDecoder();
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57 encoder = fsEncoding.newEncoder();
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58 Charset utf8 = getUTF8();
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59 if (fsEncoding.equals(utf8)) {
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60 utfDecoder = decoder;
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61 utfEncoder = encoder;
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62 } else {
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63 utfDecoder = utf8.newDecoder();
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64 utfEncoder = utf8.newEncoder();
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65 }
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66 }
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67
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68 /**
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69 * Translate file names from manifest to amazing Unicode string
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70 */
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71 public String fromManifest(byte[] data, int start, int length) {
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72 return decodeWithSystemDefaultFallback(data, start, length);
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73 }
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74
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75 /**
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76 * @return byte representation of the string directly comparable to bytes in manifest
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77 */
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78 public byte[] toManifest(CharSequence s) {
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79 if (s == null) {
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80 // perhaps, can return byte[0] in this case?
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81 throw new IllegalArgumentException();
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82 }
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83 return toArray(encodeWithSystemDefaultFallback(s));
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84 }
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85
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86 /**
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87 * Translate file names from dirstate to amazing Unicode string
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88 */
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89 public String fromDirstate(byte[] data, int start, int length) {
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90 return decodeWithSystemDefaultFallback(data, start, length);
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91 }
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92
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93 public byte[] toDirstate(CharSequence fname) {
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94 if (fname == null) {
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95 throw new IllegalArgumentException();
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96 }
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97 return toArray(encodeWithSystemDefaultFallback(fname));
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98 }
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99
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100 /**
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101 * prepare filename to be serialized into fncache file
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102 */
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103 public ByteBuffer toFNCache(CharSequence fname) {
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104 return encodeWithSystemDefaultFallback(fname);
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105 }
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106
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107 public byte[] toBundle(CharSequence fname) {
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108 // yes, mercurial transfers filenames in local encoding
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109 // so that if your local encoding doesn't match that on server,
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110 // and you use native characters, you'd likely fail
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111 return toArray(encodeWithSystemDefaultFallback(fname));
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112 }
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113 public String fromBundle(byte[] data, int start, int length) {
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114 return decodeWithSystemDefaultFallback(data, start, length);
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115 }
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118 public String userFromChangeset(byte[] data, int start, int length) {
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119 return decodeUnicodeWithFallback(data, start, length);
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120 }
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121
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122 public String commentFromChangeset(byte[] data, int start, int length) {
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123 return decodeUnicodeWithFallback(data, start, length);
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124 }
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125
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126 public String fileFromChangeset(byte[] data, int start, int length) {
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127 return decodeWithSystemDefaultFallback(data, start, length);
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128 }
525
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129
667
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130 public byte[] userToChangeset(CharSequence user) {
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131 return toArray(encodeUnicode(user));
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132 }
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133
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134 public byte[] commentToChangeset(CharSequence comment) {
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135 return toArray(encodeUnicode(comment));
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136 }
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137
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138 public byte[] fileToChangeset(CharSequence file) {
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139 return toArray(encodeWithSystemDefaultFallback(file));
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140 }
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141
525
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142 private String decodeWithSystemDefaultFallback(byte[] data, int start, int length) {
415
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143 try {
525
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144 return decoder.decode(ByteBuffer.wrap(data, start, length)).toString();
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145 } catch (CharacterCodingException ex) {
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146 sessionContext.getLog().dump(getClass(), Error, ex, String.format("Use of charset %s failed, resort to system default", charset().name()));
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147 // resort to system-default
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148 return new String(data, start, length);
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149 }
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150 }
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151
667
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152 private ByteBuffer encodeWithSystemDefaultFallback(CharSequence s) {
525
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153 try {
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154 // synchronized(encoder) {
667
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155 return encoder.encode(CharBuffer.wrap(s));
415
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156 // }
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157 } catch (CharacterCodingException ex) {
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158 sessionContext.getLog().dump(getClass(), Error, ex, String.format("Use of charset %s failed, resort to system default", charset().name()));
415
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159 // resort to system-default
667
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160 return ByteBuffer.wrap(s.toString().getBytes());
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161 }
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162 }
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163
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164 private byte[] toArray(ByteBuffer bb) {
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165 byte[] rv;
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166 if (bb.hasArray() && bb.arrayOffset() == 0) {
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167 rv = bb.array();
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168 if (rv.length == bb.remaining()) {
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169 return rv;
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170 }
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171 // fall through
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172 }
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173 rv = new byte[bb.remaining()];
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174 bb.get(rv, 0, rv.length);
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175 return rv;
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176 }
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177
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178 private String decodeUnicodeWithFallback(byte[] data, int start, int length) {
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179 try {
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180 return utfDecoder.decode(ByteBuffer.wrap(data, start, length)).toString();
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181 } catch (CharacterCodingException ex) {
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182 // TODO post-1.2 respect ui.fallbackencoding actual setting
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183 return new String(data, start, length, Charset.forName("ISO-8859-1"));
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184 }
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185 }
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186
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187 private ByteBuffer encodeUnicode(CharSequence s) {
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188 //
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189 try {
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190 return utfEncoder.encode(CharBuffer.wrap(s));
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191 } catch (CharacterCodingException ex) {
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192 byte[] rv;
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193 try {
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194 rv = s.toString().getBytes(getUTF8().name()); // XXX Java 1.5
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195 } catch (UnsupportedEncodingException e) {
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196 throw new HgInvalidStateException("Unexpected error trying to get UTF-8 encoding");
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197 }
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198 return ByteBuffer.wrap(rv);
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199 }
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200 }
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201
418
528b6780a8bd A bit of FIXME cleanup (mostly degraded to TODO post 1.0), comments and javadoc
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202 private Charset charset() {
412
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203 return encoder.charset();
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204 }
415
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205
527
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206 public static Charset getUTF8() {
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207 return Charset.forName("UTF-8");
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diff changeset
208 }
320
678e326fd27c Issue 15: Exception accessing oddly named file from history
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diff changeset
209 }