Mercurial > jhg
annotate src/org/tmatesoft/hg/util/Path.java @ 380:9517df1ef7ec
Comments/javadoc
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 09 Feb 2012 18:57:14 +0100 (2012-02-09) |
parents | 863356c2847e |
children | 12f668401613 |
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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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18 |
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19 import java.util.Collection; |
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20 import java.util.Iterator; |
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21 import java.util.NoSuchElementException; |
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22 |
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23 /** |
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24 * Identify repository files (not String nor io.File). Convenient for pattern matching. Memory-friendly. |
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25 * |
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26 * @author Artem Tikhomirov |
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27 * @author TMate Software Ltd. |
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28 */ |
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29 public final class Path implements CharSequence, Comparable<Path>/*Cloneable? - although clone for paths make no sense*/{ |
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30 // private String[] segments; |
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31 // private int flags; // dir, unparsed |
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32 private String path; |
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33 |
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34 /*package-local*/Path(String p) { |
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35 path = p; |
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36 } |
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37 |
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38 /** |
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39 * Check if this is directory's path. |
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40 * Note, this method doesn't perform any file system operation. |
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41 * |
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42 * @return true when this path points to a directory |
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43 */ |
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44 public boolean isDirectory() { |
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45 // XXX simple logic for now. Later we may decide to have an explicit factory method to create directory paths |
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46 return path.charAt(path.length() - 1) == '/'; |
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47 } |
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48 |
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49 public int length() { |
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50 return path.length(); |
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51 } |
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52 |
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53 public char charAt(int index) { |
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54 return path.charAt(index); |
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55 } |
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56 |
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57 public CharSequence subSequence(int start, int end) { |
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58 // new Path if start-end matches boundaries of any subpath |
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59 return path.substring(start, end); |
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60 } |
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61 |
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62 @Override |
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63 public String toString() { |
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64 return path; // CharSequence demands toString() impl |
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65 } |
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66 |
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67 public Iterable<String> segments() { |
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68 class SegSeq implements Iterable<String>, Iterator<String> { |
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69 private int pos; // first char to return |
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70 |
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71 public Iterator<String> iterator() { |
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72 reset(); |
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73 return this; |
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74 } |
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75 public boolean hasNext() { |
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76 return pos < path.length(); |
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77 } |
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78 public String next() { |
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79 if (pos >= path.length()) { |
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80 throw new NoSuchElementException(); |
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81 } |
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82 int x = path.indexOf('/', pos); |
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83 if (x == -1) { |
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84 String rv = path.substring(pos); |
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85 pos = path.length(); |
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86 return rv; |
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87 } else { |
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88 String rv = path.substring(pos, x); |
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89 pos = x+1; |
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90 return rv; |
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91 } |
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92 } |
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93 public void remove() { |
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94 throw new UnsupportedOperationException(); |
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95 } |
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96 |
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97 private void reset() { |
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98 pos = 0; |
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99 } |
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100 }; |
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101 return new SegSeq(); |
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102 } |
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103 |
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104 public int compareTo(Path o) { |
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105 return path.compareTo(o.path); |
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106 } |
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107 |
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108 @Override |
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109 public boolean equals(Object obj) { |
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110 if (obj != null && getClass() == obj.getClass()) { |
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111 return this == obj || path.equals(((Path) obj).path); |
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112 } |
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113 return false; |
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114 } |
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115 @Override |
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116 public int hashCode() { |
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117 return path.hashCode(); |
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118 } |
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119 |
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120 public enum CompareResult { |
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121 Same, Unrelated, Nested, Parent, /* perhaps, also ImmediateParent, DirectChild? */ |
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122 } |
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123 |
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124 /* |
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125 * a/file and a/dir ? |
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126 */ |
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127 public CompareResult compareWith(Path another) { |
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128 if (another == null) { |
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129 return CompareResult.Unrelated; // XXX perhaps, IAE? |
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130 } |
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131 if (another == this || (another.length() == length() && equals(another))) { |
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132 return CompareResult.Same; |
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133 } |
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134 if (path.startsWith(another.path)) { |
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135 return CompareResult.Nested; |
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136 } |
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137 if (another.path.startsWith(path)) { |
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138 return CompareResult.Parent; |
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139 } |
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140 return CompareResult.Unrelated; |
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141 } |
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142 |
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143 public static Path create(CharSequence path) { |
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144 if (path == null) { |
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145 throw new IllegalArgumentException(); |
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146 } |
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147 if (path instanceof Path) { |
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148 Path o = (Path) path; |
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149 return o; |
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150 } |
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151 String p = path.toString(); |
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152 if (p.indexOf('\\') != -1) { |
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153 throw new IllegalArgumentException(); |
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154 } |
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155 Path rv = new Path(p); |
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156 return rv; |
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157 } |
133
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158 |
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159 /** |
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160 * Path filter. |
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161 */ |
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162 public interface Matcher { |
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163 boolean accept(Path path); |
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164 |
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165 final class Any implements Matcher { |
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166 public boolean accept(Path path) { return true; } |
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167 } |
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168 class Composite implements Matcher { |
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169 private final Path.Matcher[] elements; |
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170 |
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171 public Composite(Collection<Path.Matcher> matchers) { |
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172 elements = matchers.toArray(new Path.Matcher[matchers.size()]); |
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173 } |
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174 |
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175 public boolean accept(Path path) { |
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176 for (Path.Matcher m : elements) { |
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177 if (m.accept(path)) { |
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178 return true; |
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179 } |
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180 } |
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181 return false; |
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182 } |
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183 } |
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184 } |
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185 |
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186 /** |
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187 * Factory for paths |
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188 */ |
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189 public interface Source { |
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190 Path path(String p); |
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191 } |
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192 |
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193 /** |
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194 * Straightforward {@link Source} implementation that creates new Path instance for each supplied string |
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195 */ |
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196 public static class SimpleSource implements Source { |
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197 private final PathRewrite normalizer; |
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198 |
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199 public SimpleSource(PathRewrite pathRewrite) { |
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200 if (pathRewrite == null) { |
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201 throw new IllegalArgumentException(); |
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202 } |
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203 normalizer = pathRewrite; |
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204 } |
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205 |
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206 public Path path(String p) { |
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207 return Path.create(normalizer.rewrite(p)); |
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208 } |
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209 } |
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210 } |