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annotate src/org/tmatesoft/hg/internal/StoragePathHelper.java @ 80:4222b04f34ee

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 25 Jan 2011 03:54:32 +0100
parents 6f1b88693d48
children a5275143664c
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74
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1 /*
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2 * Copyright (c) 2011 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@svnkit.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.util.Arrays;
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20 import java.util.TreeSet;
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21
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22 import org.tmatesoft.hg.repo.HgRepository;
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23 import org.tmatesoft.hg.util.PathRewrite;
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24
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25 /**
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26 * @see http://mercurial.selenic.com/wiki/CaseFoldingPlan
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27 * @see http://mercurial.selenic.com/wiki/fncacheRepoFormat
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 class StoragePathHelper implements PathRewrite {
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33
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34 private final boolean store;
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35 private final boolean fncache;
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36 private final boolean dotencode;
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37
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38 public StoragePathHelper(boolean isStore, boolean isFncache, boolean isDotencode) {
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39 store = isStore;
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40 fncache = isFncache;
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41 dotencode = isDotencode;
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42 }
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43
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44 // FIXME document what path argument is, whether it includes .i or .d, and whether it's 'normalized' (slashes) or not.
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45 // since .hg/store keeps both .i files and files without extension (e.g. fncache), guees, for data == false
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46 // we shall assume path has extension
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47 // FIXME much more to be done, see store.py:_hybridencode
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48 public String rewrite(String path) {
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49 final String STR_STORE = "store/";
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50 final String STR_DATA = "data/";
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51 final String STR_DH = "dh/";
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52
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53 path = path.replace(".hg/", ".hg.hg/").replace(".i/", ".i.hg/").replace(".d/", ".d.hg/");
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54 StringBuilder sb = new StringBuilder(path.length() << 1);
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55 if (store || fncache) {
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56 // encodefilename
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57 final String reservedChars = "\\:*?\"<>|";
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58 // in fact, \\ is unlikely to match, ever - we've replaced all of them already, above. Just regards to store.py
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59 int x;
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60 char[] hexByte = new char[2];
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61 for (int i = 0; i < path.length(); i++) {
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62 final char ch = path.charAt(i);
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63 if (ch >= 'a' && ch <= 'z') {
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64 sb.append(ch); // POIRAE
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65 } else if (ch >= 'A' && ch <= 'Z') {
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66 sb.append('_');
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67 sb.append(Character.toLowerCase(ch)); // Perhaps, (char) (((int) ch) + 32)? Even better, |= 0x20?
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68 } else if ( (x = reservedChars.indexOf(ch)) != -1) {
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69 sb.append('~');
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70 sb.append(toHexByte(reservedChars.charAt(x), hexByte));
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71 } else if ((ch >= '~' /*126*/ && ch <= 255) || ch < ' ' /*32*/) {
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72 sb.append('~');
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73 sb.append(toHexByte(ch, hexByte));
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74 } else if (ch == '_') {
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75 // note, encoding from store.py:_buildencodefun and :_build_lower_encodefun
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76 // differ in the way they process '_' (latter doesn't escape it)
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77 sb.append('_');
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78 sb.append('_');
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79 } else {
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80 sb.append(ch);
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81 }
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82 }
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83 // auxencode
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84 if (fncache) {
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85 x = 0; // last segment start
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86 final TreeSet<String> windowsReservedFilenames = new TreeSet<String>();
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87 windowsReservedFilenames.addAll(Arrays.asList("con prn aux nul com1 com2 com3 com4 com5 com6 com7 com8 com9 lpt1 lpt2 lpt3 lpt4 lpt5 lpt6 lpt7 lpt8 lpt9".split(" ")));
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88 do {
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89 int i = sb.indexOf("/", x);
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90 if (i == -1) {
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91 i = sb.length();
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92 }
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93 // windows reserved filenames are at least of length 3
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94 if (i - x >= 3) {
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95 boolean found = false;
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96 if (i-x == 3) {
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97 found = windowsReservedFilenames.contains(sb.subSequence(x, i));
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98 } else if (sb.charAt(x+3) == '.') { // implicit i-x > 3
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99 found = windowsReservedFilenames.contains(sb.subSequence(x, x+3));
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100 } else if (i-x > 4 && sb.charAt(x+4) == '.') {
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101 found = windowsReservedFilenames.contains(sb.subSequence(x, x+4));
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102 }
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103 if (found) {
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104 sb.setCharAt(x, '~');
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105 sb.insert(x+1, toHexByte(sb.charAt(x+2), hexByte));
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106 i += 2;
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107 }
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108 }
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109 if (dotencode && (sb.charAt(x) == '.' || sb.charAt(x) == ' ')) {
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110 sb.insert(x+1, toHexByte(sb.charAt(x), hexByte));
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111 sb.setCharAt(x, '~'); // setChar *after* charAt/insert to get ~2e, not ~7e for '.'
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112 i += 2;
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113 }
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114 x = i+1;
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115 } while (x < sb.length());
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116 }
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117 }
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118 final int MAX_PATH_LEN_IN_HGSTORE = 120;
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119 if (fncache && (sb.length() + STR_DATA.length() > MAX_PATH_LEN_IN_HGSTORE)) {
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120 throw HgRepository.notImplemented(); // FIXME digest and fncache use
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121 }
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122 if (store) {
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123 sb.insert(0, STR_STORE + STR_DATA);
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124 }
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125 sb.append(".i");
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126 return sb.toString();
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127 }
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128
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129 private static char[] toHexByte(int ch, char[] buf) {
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130 assert buf.length > 1;
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131 final String hexDigits = "0123456789abcdef";
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132 buf[0] = hexDigits.charAt((ch & 0x00F0) >>> 4);
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133 buf[1] = hexDigits.charAt(ch & 0x0F);
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134 return buf;
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135 }
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136 }