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annotate src/org/tmatesoft/hg/internal/EncodingHelper.java @ 444:b3b1db9301a2

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Few comments that emerged while working on examples
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 May 2012 20:19:22 +0200
parents 528b6780a8bd
children 909306e412e2
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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 java.nio.ByteBuffer;
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20 import java.nio.CharBuffer;
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21 import java.nio.charset.CharacterCodingException;
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22 import java.nio.charset.Charset;
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23 import java.nio.charset.CharsetDecoder;
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24 import java.nio.charset.CharsetEncoder;
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25
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26 import org.tmatesoft.hg.core.SessionContext;
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27
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28 /**
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29 * Keep all encoding-related issues in the single place
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30 * NOT thread-safe (encoder and decoder requires synchronized access)
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 public class EncodingHelper {
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35 // XXX perhaps, shall not be full of statics, but rather an instance coming from e.g. HgRepository?
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36 /*
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37 * To understand what Mercurial thinks of UTF-8 and Unix byte approach to names, see
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38 * http://mercurial.808500.n3.nabble.com/Unicode-support-request-td3430704.html
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39 */
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40
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41 private final SessionContext sessionContext;
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42 private final CharsetEncoder encoder;
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43 private final CharsetDecoder decoder;
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44
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45 EncodingHelper(Charset fsEncoding, SessionContext ctx) {
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46 sessionContext = ctx;
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47 decoder = fsEncoding.newDecoder();
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48 encoder = fsEncoding.newEncoder();
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49 }
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51 /**
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52 * Translate file names from manifest to amazing Unicode string
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53 */
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54 public String fromManifest(byte[] data, int start, int length) {
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55 return decodeWithSystemDefaultFallback(data, start, length);
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56 }
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57
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58 /**
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59 * @return byte representation of the string directly comparable to bytes in manifest
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60 */
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61 public byte[] toManifest(String s) {
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62 if (s == null) {
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63 // perhaps, can return byte[0] in this case?
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64 throw new IllegalArgumentException();
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65 }
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66 try {
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67 // synchonized(encoder) {
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68 ByteBuffer bb = encoder.encode(CharBuffer.wrap(s));
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69 // }
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70 byte[] rv = new byte[bb.remaining()];
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71 bb.get(rv, 0, rv.length);
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72 return rv;
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73 } catch (CharacterCodingException ex) {
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74 sessionContext.getLog().error(getClass(), ex, String.format("Use of charset %s failed, resort to system default", charset().name()));
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75 // resort to system-default
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76 return s.getBytes();
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77 }
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78 }
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80 /**
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81 * Translate file names from dirstate to amazing Unicode string
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82 */
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83 public String fromDirstate(byte[] data, int start, int length) {
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84 return decodeWithSystemDefaultFallback(data, start, length);
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85 }
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87 private String decodeWithSystemDefaultFallback(byte[] data, int start, int length) {
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88 try {
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89 return decoder.decode(ByteBuffer.wrap(data, start, length)).toString();
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90 } catch (CharacterCodingException ex) {
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91 sessionContext.getLog().error(getClass(), ex, String.format("Use of charset %s failed, resort to system default", charset().name()));
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92 // resort to system-default
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93 return new String(data, start, length);
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94 }
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95 }
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97 private Charset charset() {
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98 return encoder.charset();
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99 }
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101 }