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annotate src/org/tmatesoft/hg/util/Path.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
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
a3a2e5deb320 Updated contact address to support@hg4j.com
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15 * contact TMate Software at support@hg4j.com
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16 */
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4a948ec83980 core.Path to util.Path as it's not Hg repo dependant
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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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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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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(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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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 }
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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 }