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annotate src/org/tmatesoft/hg/util/Path.java @ 254:a620f0663a37

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Collect tags for a file - improve performance of 'sparse' manifest reads
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Aug 2011 04:03:29 +0200
parents 1ec6b327a6ac
children a415fe296a50
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 */
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17 package org.tmatesoft.hg.util;
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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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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(String 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.indexOf('\\') != -1) {
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109 throw new IllegalArgumentException();
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110 }
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111 Path rv = new Path(path);
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112 return rv;
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113 }
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115 /**
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116 * Path filter.
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117 */
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118 public interface Matcher {
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119 boolean accept(Path path);
229
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120
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121 final class Any implements Matcher {
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122 public boolean accept(Path path) { return true; }
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123 }
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124 class Composite implements Matcher {
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125 private final Path.Matcher[] elements;
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126
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127 public Composite(Collection<Path.Matcher> matchers) {
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128 elements = matchers.toArray(new Path.Matcher[matchers.size()]);
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129 }
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130
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131 public boolean accept(Path path) {
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132 for (Path.Matcher m : elements) {
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133 if (m.accept(path)) {
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134 return true;
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135 }
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136 }
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137 return false;
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138 }
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139 }
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140 }
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141
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142 /**
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143 * Factory for paths
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144 */
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145 public interface Source {
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146 Path path(String p);
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147 }
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148
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149 /**
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150 * Straightforward {@link Source} implementation that creates new Path instance for each supplied string
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151 */
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152 public static class SimpleSource implements Source {
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153 private final PathRewrite normalizer;
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154
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155 public SimpleSource(PathRewrite pathRewrite) {
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156 if (pathRewrite == null) {
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157 throw new IllegalArgumentException();
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158 }
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159 normalizer = pathRewrite;
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160 }
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161
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162 public Path path(String p) {
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163 return Path.create(normalizer.rewrite(p));
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164 }
64
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165 }
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166 }