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annotate src/org/tmatesoft/hg/internal/EncodingHelper.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents f568330dd9c0
children
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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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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117
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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) {
456
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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
682
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183 try {
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184 return new String(data, start, length, "ISO-8859-1"); // XXX java5
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185 } catch (UnsupportedEncodingException e) {
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186 throw new HgInvalidStateException(ex.getMessage());
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187 }
667
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188 }
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189 }
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190
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191 private ByteBuffer encodeUnicode(CharSequence s) {
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192 //
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193 try {
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194 return utfEncoder.encode(CharBuffer.wrap(s));
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195 } catch (CharacterCodingException ex) {
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diff changeset
196 byte[] rv;
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197 try {
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198 rv = s.toString().getBytes(getUTF8().name()); // XXX Java 1.5
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199 } catch (UnsupportedEncodingException e) {
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200 throw new HgInvalidStateException("Unexpected error trying to get UTF-8 encoding");
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201 }
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diff changeset
202 return ByteBuffer.wrap(rv);
415
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203 }
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diff changeset
204 }
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diff changeset
205
418
528b6780a8bd A bit of FIXME cleanup (mostly degraded to TODO post 1.0), comments and javadoc
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diff changeset
206 private Charset charset() {
412
63c5a9d7ca3f Follow-up for Issue 29: unify path translation for manifest and dirstate
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parents: 321
diff changeset
207 return encoder.charset();
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diff changeset
208 }
415
ee8264d80747 Explicit constant for regular file flags, access to flags for a given file revision
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diff changeset
209
527
47b7bedf0569 Tests for present HgCheckoutCommand functionality. Update branch information on checkout. Use UTF8 encoding for the branch file
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diff changeset
210 public static Charset getUTF8() {
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diff changeset
211 return Charset.forName("UTF-8");
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diff changeset
212 }
320
678e326fd27c Issue 15: Exception accessing oddly named file from history
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parents:
diff changeset
213 }