Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/PathPool.java @ 476:c02b5710d9ac
Defect: only first file in directory got flags initialized
| author | Artem Tikhomirov <tikhomirov.artem@gmail.com> | 
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| date | Thu, 12 Jul 2012 18:07:12 +0200 | 
| parents | 12f668401613 | 
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changeset | 1 /* | 
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changeset | 2 * Copyright (c) 2011-2012 TMate Software Ltd | 
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changeset | 3 * | 
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changeset | 4 * This program is free software; you can redistribute it and/or modify | 
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changeset | 5 * it under the terms of the GNU General Public License as published by | 
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changeset | 6 * the Free Software Foundation; version 2 of the License. | 
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changeset | 7 * | 
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changeset | 8 * This program is distributed in the hope that it will be useful, | 
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changeset | 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of | 
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changeset | 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 
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changeset | 11 * GNU General Public License for more details. | 
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changeset | 12 * | 
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changeset | 13 * For information on how to redistribute this software under | 
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changeset | 14 * the terms of a license other than GNU General Public License | 
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changeset | 15 * contact TMate Software at support@hg4j.com | 
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changeset | 16 */ | 
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changeset | 17 package org.tmatesoft.hg.internal; | 
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changeset | 18 | 
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changeset | 19 import java.lang.ref.SoftReference; | 
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changeset | 20 import java.util.WeakHashMap; | 
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changeset | 21 | 
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changeset | 22 import org.tmatesoft.hg.util.Convertor; | 
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changeset | 23 import org.tmatesoft.hg.util.Path; | 
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changeset | 24 import org.tmatesoft.hg.util.PathRewrite; | 
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changeset | 25 | 
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changeset | 26 | 
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changeset | 27 /** | 
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changeset | 28 * Produces path from strings and caches (weakly) result for reuse | 
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changeset | 29 * | 
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changeset | 30 * @author Artem Tikhomirov | 
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changeset | 31 * @author TMate Software Ltd. | 
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changeset | 32 */ | 
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changeset | 33 public class PathPool implements Path.Source, Convertor<Path> { | 
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changeset | 34 private final WeakHashMap<CharSequence, SoftReference<Path>> cache; | 
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changeset | 35 private final PathRewrite pathRewrite; | 
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changeset | 36 | 
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changeset | 37 public PathPool(PathRewrite rewrite) { | 
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changeset | 38 pathRewrite = rewrite; | 
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changeset | 39 cache = new WeakHashMap<CharSequence, SoftReference<Path>>(); | 
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changeset | 40 } | 
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changeset | 41 | 
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changeset | 42 /* | 
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changeset | 43 * (non-Javadoc) | 
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changeset | 44 * @see org.tmatesoft.hg.util.Path.Source#path(java.lang.CharSequence) | 
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changeset | 45 */ | 
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changeset | 46 public Path path(CharSequence p) { | 
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changeset | 47 if (p instanceof Path) { | 
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changeset | 48 return asPath((Path) p); | 
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changeset | 49 } | 
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changeset | 50 p = pathRewrite.rewrite(p); | 
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changeset | 51 return get(p, true); | 
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changeset | 52 } | 
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changeset | 53 | 
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changeset | 54 /* | 
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changeset | 55 * (non-Javadoc) | 
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changeset | 56 * @see org.tmatesoft.hg.util.Convertor#mangle(java.lang.Object) | 
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changeset | 57 */ | 
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changeset | 58 public Path mangle(Path p) { | 
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changeset | 59 return asPath(p); | 
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changeset | 60 } | 
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changeset | 61 | 
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changeset | 62 // pipes path object through cache to reuse instance, if possible | 
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changeset | 63 // TODO unify with Pool<Path> | 
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changeset | 64 private Path asPath(Path p) { | 
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changeset | 65 CharSequence s = pathRewrite.rewrite(p.toString()); | 
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changeset | 66 // rewrite string, not path to avoid use of Path object as key | 
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changeset | 67 // in case pathRewrite does nothing and returns supplied instance | 
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changeset | 68 // | 
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changeset | 69 Path cached = get(s, false); | 
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changeset | 70 if (cached == null) { | 
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changeset | 71 cache.put(s, new SoftReference<Path>(cached = p)); | 
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changeset | 72 } | 
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changeset | 73 return cached; | 
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changeset | 74 } | 
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changeset | 75 | 
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changeset | 76 // XXX what would be parent of an empty path? | 
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changeset | 77 // Path shall have similar functionality | 
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changeset | 78 public Path parent(Path path) { | 
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changeset | 79 if (path.length() == 0) { | 
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changeset | 80 throw new IllegalArgumentException(); | 
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changeset | 81 } | 
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changeset | 82 for (int i = path.length() - 2 /*if path represents a dir, trailing char is slash, skip*/; i >= 0; i--) { | 
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changeset | 83 if (path.charAt(i) == '/') { | 
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changeset | 84 return get(path.subSequence(0, i+1).toString(), true); | 
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changeset | 85 } | 
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changeset | 86 } | 
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changeset | 87 return get("", true); | 
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changeset | 88 } | 
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changeset | 89 | 
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changeset | 90 // invoke when path pool is no longer in use, to ease gc work | 
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changeset | 91 public void clear() { | 
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changeset | 92 cache.clear(); | 
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changeset | 93 } | 
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changeset | 94 | 
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changeset | 95 private Path get(CharSequence p, boolean create) { | 
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changeset | 96 SoftReference<Path> sr = cache.get(p); | 
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changeset | 97 Path path = sr == null ? null : sr.get(); | 
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changeset | 98 if (path == null) { | 
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changeset | 99 if (create) { | 
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changeset | 100 path = Path.create(p); | 
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changeset | 101 cache.put(p, new SoftReference<Path>(path)); | 
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changeset | 102 } else if (sr != null) { | 
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changeset | 103 // cached path no longer used, clear cache entry - do not wait for RefQueue to step in | 
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changeset | 104 cache.remove(p); | 
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changeset | 105 } | 
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 Artem Tikhomirov <tikhomirov.artem@gmail.com> parents: diff
changeset | 106 } | 
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19e9e220bf68
Convenient commands constitute hi-level API. org.tmatesoft namespace, GPL2 statement
 Artem Tikhomirov <tikhomirov.artem@gmail.com> parents: diff
changeset | 107 return path; | 
| 
19e9e220bf68
Convenient commands constitute hi-level API. org.tmatesoft namespace, GPL2 statement
 Artem Tikhomirov <tikhomirov.artem@gmail.com> parents: diff
changeset | 108 } | 
| 
19e9e220bf68
Convenient commands constitute hi-level API. org.tmatesoft namespace, GPL2 statement
 Artem Tikhomirov <tikhomirov.artem@gmail.com> parents: diff
changeset | 109 } | 
