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annotate src/org/tmatesoft/hg/util/Path.java @ 444:b3b1db9301a2

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Few comments that emerged while working on examples
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 May 2012 20:19:22 +0200
parents 072b5f3ed0c8
children fedc54356091 49f0749307a0
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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
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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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53 public char charAt(int index) {
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54 return path.charAt(index);
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55 }
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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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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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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, ImmediateChild, Nested, ImmediateParent, Parent /* +CommonParent ?*/
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122 }
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123
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124 /**
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125 * @return one of {@link CompareResult} constants to indicate relations between the paths
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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 // one of the parties can't be parent in parent/nested, the other may be either file or folder
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135 if (another.isDirectory() && path.startsWith(another.path)) {
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136 return isOneSegmentDifference(path, another.path) ? CompareResult.ImmediateChild : CompareResult.Nested;
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137 }
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138 if (isDirectory() && another.path.startsWith(path)) {
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139 return isOneSegmentDifference(another.path, path) ? CompareResult.ImmediateParent : CompareResult.Parent;
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140 }
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141 return CompareResult.Unrelated;
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142 }
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143
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144 // true if p1 is only one segment larger than p2
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145 private static boolean isOneSegmentDifference(String p1, String p2) {
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146 assert p1.startsWith(p2);
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147 String p1Tail= p1.substring(p2.length());
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148 int slashLoc = p1Tail.indexOf('/');
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149 return slashLoc == -1 || slashLoc == p1Tail.length() - 1;
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150 }
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151
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152 public static Path create(CharSequence path) {
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153 if (path == null) {
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154 throw new IllegalArgumentException();
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155 }
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156 if (path instanceof Path) {
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157 Path o = (Path) path;
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158 return o;
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159 }
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160 String p = path.toString();
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161 if (p.indexOf('\\') != -1) {
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162 throw new IllegalArgumentException();
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163 }
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164 Path rv = new Path(p);
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165 return rv;
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166 }
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167
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168 /**
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169 * Path filter.
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170 */
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171 public interface Matcher {
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172 boolean accept(Path path);
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173
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174 final class Any implements Matcher {
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175 public boolean accept(Path path) { return true; }
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176 }
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177 class Composite implements Matcher {
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178 private final Path.Matcher[] elements;
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179
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180 public Composite(Collection<Path.Matcher> matchers) {
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181 elements = matchers.toArray(new Path.Matcher[matchers.size()]);
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182 }
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183
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184 public boolean accept(Path path) {
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185 for (Path.Matcher m : elements) {
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186 if (m.accept(path)) {
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187 return true;
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188 }
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189 }
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190 return false;
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191 }
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192 }
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193 }
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194
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195 /**
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196 * Factory for paths
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197 */
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198 public interface Source {
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199 Path path(CharSequence p);
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200 }
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201
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202 /**
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203 * Straightforward {@link Source} implementation that creates new Path instance for each supplied string
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204 * and optionally piping through a converter to get e.g. cached instance
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205 */
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206 public static class SimpleSource implements Source {
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207 private final PathRewrite normalizer;
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208 private final Convertor<Path> convertor;
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209
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210 public SimpleSource() {
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211 this(new PathRewrite.Empty(), null);
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212 }
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213
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214 public SimpleSource(PathRewrite pathRewrite) {
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215 this(pathRewrite, null);
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216 }
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217
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218 public SimpleSource(PathRewrite pathRewrite, Convertor<Path> pathConvertor) {
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219 normalizer = pathRewrite;
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220 convertor = pathConvertor;
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221 }
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222
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223 public Path path(CharSequence p) {
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224 Path rv = Path.create(normalizer.rewrite(p));
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225 if (convertor != null) {
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226 return convertor.mangle(rv);
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227 }
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228 return rv;
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229 }
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230 }
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231 }