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annotate src/org/tmatesoft/hg/internal/EncodingHelper.java @ 564:e6407313bab7

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Recognize re: in-line prefix for regular expressions as native client does, despite silence in hgingore.5
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 03 Apr 2013 21:28:06 +0200
parents 47b7bedf0569
children fba85bc1dfb8
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.nio.ByteBuffer;
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22 import java.nio.CharBuffer;
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23 import java.nio.charset.CharacterCodingException;
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24 import java.nio.charset.Charset;
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25 import java.nio.charset.CharsetDecoder;
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26 import java.nio.charset.CharsetEncoder;
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27
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28 import org.tmatesoft.hg.core.SessionContext;
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29
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30 /**
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31 * Keep all encoding-related issues in the single place
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32 * NOT thread-safe (encoder and decoder requires synchronized access)
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33 * @author Artem Tikhomirov
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34 * @author TMate Software Ltd.
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35 */
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36 public class EncodingHelper {
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37 // XXX perhaps, shall not be full of statics, but rather an instance coming from e.g. HgRepository?
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38 /*
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39 * To understand what Mercurial thinks of UTF-8 and Unix byte approach to names, see
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40 * http://mercurial.808500.n3.nabble.com/Unicode-support-request-td3430704.html
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41 */
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42
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43 private final SessionContext sessionContext;
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44 private final CharsetEncoder encoder;
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45 private final CharsetDecoder decoder;
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46
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47 EncodingHelper(Charset fsEncoding, SessionContext ctx) {
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48 sessionContext = ctx;
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49 decoder = fsEncoding.newDecoder();
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50 encoder = fsEncoding.newEncoder();
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51 }
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52
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53 /**
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54 * Translate file names from manifest to amazing Unicode string
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55 */
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56 public String fromManifest(byte[] data, int start, int length) {
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57 return decodeWithSystemDefaultFallback(data, start, length);
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58 }
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59
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60 /**
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61 * @return byte representation of the string directly comparable to bytes in manifest
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62 */
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63 public byte[] toManifest(CharSequence s) {
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64 if (s == null) {
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65 // perhaps, can return byte[0] in this case?
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66 throw new IllegalArgumentException();
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67 }
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68 return encodeWithSystemDefaultFallback(s);
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69 }
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70
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71 /**
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72 * Translate file names from dirstate to amazing Unicode string
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73 */
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74 public String fromDirstate(byte[] data, int start, int length) {
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75 return decodeWithSystemDefaultFallback(data, start, length);
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76 }
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77
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78 public byte[] toDirstate(CharSequence fname) {
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79 if (fname == null) {
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80 throw new IllegalArgumentException();
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81 }
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82 return encodeWithSystemDefaultFallback(fname);
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83 }
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84
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85 private String decodeWithSystemDefaultFallback(byte[] data, int start, int length) {
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86 try {
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87 return decoder.decode(ByteBuffer.wrap(data, start, length)).toString();
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88 } catch (CharacterCodingException ex) {
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89 sessionContext.getLog().dump(getClass(), Error, ex, String.format("Use of charset %s failed, resort to system default", charset().name()));
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90 // resort to system-default
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91 return new String(data, start, length);
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92 }
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93 }
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94
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95 private byte[] encodeWithSystemDefaultFallback(CharSequence s) {
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96 try {
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97 // synchronized(encoder) {
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98 ByteBuffer bb = encoder.encode(CharBuffer.wrap(s));
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99 // }
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100 byte[] rv = new byte[bb.remaining()];
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101 bb.get(rv, 0, rv.length);
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102 return rv;
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103 } catch (CharacterCodingException ex) {
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104 sessionContext.getLog().dump(getClass(), Error, ex, String.format("Use of charset %s failed, resort to system default", charset().name()));
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105 // resort to system-default
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106 return s.toString().getBytes();
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107 }
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108 }
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109
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110 private Charset charset() {
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111 return encoder.charset();
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112 }
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113
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114 public static Charset getUTF8() {
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115 return Charset.forName("UTF-8");
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116 }
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117 }