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annotate src/org/tmatesoft/hg/util/Path.java @ 356:91d75e1bac9f

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Consistent approach to deal with adaptable objects. Give adaptable precedence over instanceof to allow conditional response when classes do implement desired interface
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 06 Dec 2011 14:25:52 +0100
parents 863356c2847e
children 12f668401613
rev   line source
64
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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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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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49 public int length() {
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50 return path.length();
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51 }
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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
292
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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);
229
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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 }