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annotate src/org/tmatesoft/hg/internal/PathScope.java @ 599:55b7987c1796

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Do not instantiate intermediate arrays
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 May 2013 15:29:26 +0200
parents 072b5f3ed0c8
children
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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.internal;
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18
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19 import static org.tmatesoft.hg.util.Path.CompareResult.*;
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20
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21 import java.util.ArrayList;
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22
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23 import org.tmatesoft.hg.util.FileIterator;
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24 import org.tmatesoft.hg.util.Path;
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25 import org.tmatesoft.hg.util.Path.CompareResult;
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26
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27 /**
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28 * <ul>
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29 * <li> Specify folder to get all files in there included, but no subdirs
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30 * <li> Specify folder to get all files and files in subdirectories included
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31 * <li> Specify exact set files (with option to accept or not paths leading to them)
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32 * </ul>
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33 * @author Artem Tikhomirov
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34 * @author TMate Software Ltd.
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35 */
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36 public class PathScope implements Path.Matcher {
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37 private final Path[] files;
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38 private final Path[] dirs;
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39 private final boolean includeNestedDirs;
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40 private final boolean includeParentDirs;
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41 private final boolean includeDirContent;
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42
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43 /**
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44 * See {@link PathScope#PathScope(boolean, boolean, Path...)}
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45 */
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46 public PathScope(boolean recursiveDirs, Path... paths) {
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47 this(true, recursiveDirs, true, paths);
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48 }
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49
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50 /**
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51 * With <code>matchParentDirs</code>, <code>recursiveDirs</code> and <code>matchDirContent</code> set to <code>false</code>,
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52 * this scope matches only exact paths specified.
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53 * <p>
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54 * With <code>matchParentDirs</code> set to <code>true</code>, parent directories for files and folders listed in
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55 * the <code>paths</code> would get accepted as well (handy for {@link FileIterator FileIterators}).
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56 * Note, if supplied path lists a file, parent directory for the file is not matched unless <code>matchParentDirs</code>
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57 * is <code>true</code>. To match file's immediate parent without matching all other parents up to the root, just add file parent
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58 * along with the file to <code>paths</code>.
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59 * <p>
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60 * With <code>recursiveDirs</code> set to <code>true</code>, subdirectories (with files) of directories listed in <code>paths</code> would
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61 * be matched as well. Similar to `a/b/**`
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62 * <p>
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63 * With <code>matchDirContent</code> set to <code>true</code>, files right under any directory listed in <code>path</code> would be matched.
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64 * Similar to `a/b/*`. Makes little sense to set to <code>false</code> when <code>recursiceDirs</code> is <code>true</code>, although may still
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65 * be useful in certain scenarios, e.g. PathScope(false, true, false, "a/") matches files under "a/b/*" and "a/b/c/*", but not files "a/*".
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66 *
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67 * @param matchParentDirs <code>true</code> to accept parent dirs of supplied paths
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68 * @param recursiveDirs <code>true</code> to include subdirectories and files of supplied paths
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69 * @param includeDirContent
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70 * @param paths files and folders to match
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71 */
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72 public PathScope(boolean matchParentDirs, boolean recursiveDirs, boolean matchDirContent, Path... paths) {
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73 if (paths == null) {
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74 throw new IllegalArgumentException();
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75 }
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76 includeParentDirs = matchParentDirs;
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77 includeNestedDirs = recursiveDirs;
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78 includeDirContent = matchDirContent;
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79 ArrayList<Path> f = new ArrayList<Path>(5);
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80 ArrayList<Path> d = new ArrayList<Path>(5);
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81 for (Path p : paths) {
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82 if (p.isDirectory()) {
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83 d.add(p);
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84 } else {
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85 f.add(p);
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86 }
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87 }
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88 files = f.toArray(new Path[f.size()]);
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89 dirs = d.toArray(new Path[d.size()]);
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90 }
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92 public boolean accept(Path path) {
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93 if (path.isDirectory()) {
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94 // either equals to or a parent of a directory we know about (i.e. configured dir is *nested* in supplied arg).
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95 // Also, accept arg if it happened to be nested into configured dir (i.e. one of them is *parent* for the arg),
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96 // and recursiveDirs is true.
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97 for (Path d : dirs) {
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98 switch(d.compareWith(path)) {
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99 case Same : return true;
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100 case ImmediateChild :
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101 case Nested : return includeParentDirs; // path is parent to one of our locations
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102 case ImmediateParent :
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103 case Parent : return includeNestedDirs; // path is nested in one of our locations
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104 }
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105 }
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106 if (!includeParentDirs) {
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107 return false;
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108 }
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109 // If one of configured files is nested under the path, and we shall report parents, accept.
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110 // Note, I don't respect includeDirContent here as with file it's easy to add parent to paths explicitly, if needed.
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111 // (if includeDirContent == .f and includeParentDirs == .f, directory than owns a scope file won't get reported)
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112 for (Path f : files) {
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113 CompareResult cr = f.compareWith(path);
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114 if (cr == Nested || cr == ImmediateChild) {
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115 return true;
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116 }
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117 }
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118 } else {
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119 for (Path f : files) {
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120 if (f.equals(path)) {
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121 return true;
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122 }
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123 }
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124 // if interested in nested/recursive dirs, shall check if supplied file is under any of our configured locations
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125 if (!includeNestedDirs && !includeDirContent) {
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126 return false;
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127 }
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128 for (Path d : dirs) {
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129 CompareResult cr = d.compareWith(path);
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130 if (includeNestedDirs && cr == Parent) {
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131 // file is nested in one of our locations
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132 return true;
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133 }
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134 if (includeDirContent && cr == ImmediateParent) {
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135 // file is right under one of our directories, and includeDirContents is .t
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136 return true;
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137 }
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138 // try another directory
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139 }
229
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140 }
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141 return false;
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142 }
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143 }