Mercurial > hg4j
annotate src/org/tmatesoft/hg/util/Path.java @ 317:09628675bcee
Rework file history build approach to match rest of the API
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 29 Sep 2011 03:20:28 +0200 |
parents | a415fe296a50 |
children | 863356c2847e |
rev | line source |
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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 |
102
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15 * contact TMate Software at support@hg4j.com |
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16 */ |
133
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17 package org.tmatesoft.hg.util; |
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18 |
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19 import java.util.Collection; |
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20 |
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21 /** |
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22 * Identify repository files (not String nor io.File). Convenient for pattern matching. Memory-friendly. |
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23 * |
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24 * @author Artem Tikhomirov |
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25 * @author TMate Software Ltd. |
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26 */ |
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27 public final class Path implements CharSequence, Comparable<Path>/*Cloneable? - although clone for paths make no sense*/{ |
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28 // private String[] segments; |
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29 // private int flags; // dir, unparsed |
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30 private String path; |
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31 |
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32 /*package-local*/Path(String p) { |
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33 path = p; |
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34 } |
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35 |
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36 /** |
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37 * Check if this is directory's path. |
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38 * Note, this method doesn't perform any file system operation. |
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39 * |
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40 * @return true when this path points to a directory |
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41 */ |
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42 public boolean isDirectory() { |
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43 // XXX simple logic for now. Later we may decide to have an explicit factory method to create directory paths |
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44 return path.charAt(path.length() - 1) == '/'; |
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45 } |
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46 |
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47 public int length() { |
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48 return path.length(); |
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49 } |
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50 |
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51 public char charAt(int index) { |
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52 return path.charAt(index); |
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53 } |
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54 |
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55 public CharSequence subSequence(int start, int end) { |
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56 // new Path if start-end matches boundaries of any subpath |
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57 return path.substring(start, end); |
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58 } |
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59 |
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60 @Override |
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61 public String toString() { |
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62 return path; // CharSequence demands toString() impl |
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63 } |
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64 |
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65 public int compareTo(Path o) { |
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66 return path.compareTo(o.path); |
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67 } |
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68 |
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69 @Override |
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70 public boolean equals(Object obj) { |
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71 if (obj != null && getClass() == obj.getClass()) { |
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72 return this == obj || path.equals(((Path) obj).path); |
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73 } |
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74 return false; |
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75 } |
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76 @Override |
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77 public int hashCode() { |
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78 return path.hashCode(); |
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79 } |
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80 |
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81 public enum CompareResult { |
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82 Same, Unrelated, Nested, Parent, /* perhaps, also ImmediateParent, DirectChild? */ |
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83 } |
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84 |
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85 /* |
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86 * a/file and a/dir ? |
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87 */ |
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88 public CompareResult compareWith(Path another) { |
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89 if (another == null) { |
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90 return CompareResult.Unrelated; // XXX perhaps, IAE? |
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91 } |
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92 if (another == this || (another.length() == length() && equals(another))) { |
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93 return CompareResult.Same; |
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94 } |
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95 if (path.startsWith(another.path)) { |
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96 return CompareResult.Nested; |
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97 } |
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98 if (another.path.startsWith(path)) { |
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99 return CompareResult.Parent; |
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100 } |
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101 return CompareResult.Unrelated; |
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102 } |
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103 |
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104 public static Path create(CharSequence path) { |
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105 if (path == null) { |
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106 throw new IllegalArgumentException(); |
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107 } |
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108 if (path instanceof Path) { |
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109 Path o = (Path) path; |
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110 return o; |
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111 } |
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112 String p = path.toString(); |
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113 if (p.indexOf('\\') != -1) { |
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114 throw new IllegalArgumentException(); |
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115 } |
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116 Path rv = new Path(p); |
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117 return rv; |
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118 } |
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119 |
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120 /** |
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121 * Path filter. |
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122 */ |
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123 public interface Matcher { |
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124 boolean accept(Path path); |
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125 |
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126 final class Any implements Matcher { |
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127 public boolean accept(Path path) { return true; } |
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128 } |
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129 class Composite implements Matcher { |
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130 private final Path.Matcher[] elements; |
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131 |
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132 public Composite(Collection<Path.Matcher> matchers) { |
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133 elements = matchers.toArray(new Path.Matcher[matchers.size()]); |
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134 } |
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135 |
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136 public boolean accept(Path path) { |
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137 for (Path.Matcher m : elements) { |
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138 if (m.accept(path)) { |
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139 return true; |
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140 } |
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141 } |
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142 return false; |
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143 } |
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144 } |
141
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145 } |
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146 |
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147 /** |
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148 * Factory for paths |
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149 */ |
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150 public interface Source { |
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151 Path path(String p); |
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152 } |
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153 |
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154 /** |
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155 * Straightforward {@link Source} implementation that creates new Path instance for each supplied string |
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156 */ |
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157 public static class SimpleSource implements Source { |
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158 private final PathRewrite normalizer; |
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159 |
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160 public SimpleSource(PathRewrite pathRewrite) { |
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161 if (pathRewrite == null) { |
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162 throw new IllegalArgumentException(); |
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163 } |
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164 normalizer = pathRewrite; |
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165 } |
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166 |
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167 public Path path(String p) { |
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168 return Path.create(normalizer.rewrite(p)); |
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169 } |
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170 } |
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171 } |