Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/PathPool.java @ 579:36e36b926747
Provide means to read user-specific configuration, with no specific repository selected
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Wed, 17 Apr 2013 16:06:10 +0200 |
parents | 12f668401613 |
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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 java.lang.ref.SoftReference; |
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20 import java.util.WeakHashMap; |
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21 |
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22 import org.tmatesoft.hg.util.Convertor; |
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23 import org.tmatesoft.hg.util.Path; |
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24 import org.tmatesoft.hg.util.PathRewrite; |
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25 |
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26 |
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27 /** |
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28 * Produces path from strings and caches (weakly) result for reuse |
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29 * |
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30 * @author Artem Tikhomirov |
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31 * @author TMate Software Ltd. |
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32 */ |
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33 public class PathPool implements Path.Source, Convertor<Path> { |
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34 private final WeakHashMap<CharSequence, SoftReference<Path>> cache; |
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35 private final PathRewrite pathRewrite; |
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36 |
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37 public PathPool(PathRewrite rewrite) { |
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38 pathRewrite = rewrite; |
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39 cache = new WeakHashMap<CharSequence, SoftReference<Path>>(); |
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40 } |
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41 |
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42 /* |
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43 * (non-Javadoc) |
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44 * @see org.tmatesoft.hg.util.Path.Source#path(java.lang.CharSequence) |
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45 */ |
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46 public Path path(CharSequence p) { |
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47 if (p instanceof Path) { |
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48 return asPath((Path) p); |
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49 } |
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50 p = pathRewrite.rewrite(p); |
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51 return get(p, true); |
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52 } |
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53 |
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54 /* |
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55 * (non-Javadoc) |
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56 * @see org.tmatesoft.hg.util.Convertor#mangle(java.lang.Object) |
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57 */ |
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58 public Path mangle(Path p) { |
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59 return asPath(p); |
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60 } |
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61 |
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62 // pipes path object through cache to reuse instance, if possible |
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63 // TODO unify with Pool<Path> |
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64 private Path asPath(Path p) { |
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65 CharSequence s = pathRewrite.rewrite(p.toString()); |
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66 // rewrite string, not path to avoid use of Path object as key |
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67 // in case pathRewrite does nothing and returns supplied instance |
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68 // |
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69 Path cached = get(s, false); |
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70 if (cached == null) { |
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71 cache.put(s, new SoftReference<Path>(cached = p)); |
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72 } |
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73 return cached; |
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74 } |
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75 |
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76 // XXX what would be parent of an empty path? |
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77 // Path shall have similar functionality |
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78 public Path parent(Path path) { |
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79 if (path.length() == 0) { |
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80 throw new IllegalArgumentException(); |
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81 } |
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82 for (int i = path.length() - 2 /*if path represents a dir, trailing char is slash, skip*/; i >= 0; i--) { |
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83 if (path.charAt(i) == '/') { |
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84 return get(path.subSequence(0, i+1).toString(), true); |
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85 } |
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86 } |
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87 return get("", true); |
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88 } |
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89 |
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90 // invoke when path pool is no longer in use, to ease gc work |
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91 public void clear() { |
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92 cache.clear(); |
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93 } |
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94 |
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95 private Path get(CharSequence p, boolean create) { |
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96 SoftReference<Path> sr = cache.get(p); |
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97 Path path = sr == null ? null : sr.get(); |
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98 if (path == null) { |
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99 if (create) { |
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100 path = Path.create(p); |
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101 cache.put(p, new SoftReference<Path>(path)); |
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102 } else if (sr != null) { |
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103 // cached path no longer used, clear cache entry - do not wait for RefQueue to step in |
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104 cache.remove(p); |
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105 } |
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106 } |
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107 return path; |
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108 } |
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109 } |