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annotate src/org/tmatesoft/hg/util/PathPool.java @ 176:a8df7162ec75

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Extracting complete branch using remote between call to detect incoming changes is done. Arguments reorderd in remote repo to better match Hg server ideology, not my mental convenience
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 02 Apr 2011 03:01:14 +0200
parents 8248aae33f7d
children 1792b37650f2
rev   line source
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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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17 package org.tmatesoft.hg.util;
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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
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23 /**
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24 * Produces path from strings and caches result for reuse
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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 class PathPool implements Path.Source {
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30 private final WeakHashMap<String, SoftReference<Path>> cache;
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31 private final PathRewrite pathRewrite;
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32
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33 public PathPool(PathRewrite rewrite) {
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34 pathRewrite = rewrite;
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35 cache = new WeakHashMap<String, SoftReference<Path>>();
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36 }
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38 public Path path(String p) {
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39 p = pathRewrite.rewrite(p);
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40 return get(p, true);
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41 }
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43 // pipes path object through cache to reuse instance, if possible
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44 public Path path(Path p) {
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45 String s = pathRewrite.rewrite(p.toString());
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46 Path cached = get(s, false);
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47 if (cached == null) {
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48 cache.put(s, new SoftReference<Path>(cached = p));
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49 }
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50 return cached;
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51 }
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53 // XXX what would be parent of an empty path?
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54 // Path shall have similar functionality
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55 public Path parent(Path path) {
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56 if (path.length() == 0) {
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57 throw new IllegalArgumentException();
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58 }
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59 for (int i = path.length() - 2 /*if path represents a dir, trailing char is slash, skip*/; i >= 0; i--) {
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60 if (path.charAt(i) == '/') {
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61 return get(path.subSequence(0, i+1).toString(), true);
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62 }
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63 }
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64 return get("", true);
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65 }
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67 private Path get(String p, boolean create) {
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68 SoftReference<Path> sr = cache.get(p);
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69 Path path = sr == null ? null : sr.get();
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70 if (path == null) {
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71 if (create) {
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72 path = Path.create(p);
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73 cache.put(p, new SoftReference<Path>(path));
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74 } else if (sr != null) {
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75 // cached path no longer used, clear cache entry - do not wait for RefQueue to step in
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76 cache.remove(p);
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77 }
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78 }
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79 return path;
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80 }
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81 }