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annotate src/org/tmatesoft/hg/util/PathPool.java @ 135:3959bffb14e9

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explicit op name instead math op to get last rev number
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 16 Feb 2011 22:00:39 +0100
parents 4a948ec83980
children 8248aae33f7d
rev   line source
64
19e9e220bf68 Convenient commands constitute hi-level API. org.tmatesoft namespace, GPL2 statement
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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
64
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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 *
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25 * @author Artem Tikhomirov
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26 * @author TMate Software Ltd.
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27 */
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28 public class PathPool {
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29 private final WeakHashMap<String, SoftReference<Path>> cache;
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30 private final PathRewrite pathRewrite;
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31
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32 public PathPool(PathRewrite rewrite) {
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33 pathRewrite = rewrite;
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34 cache = new WeakHashMap<String, SoftReference<Path>>();
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35 }
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37 public Path path(String p) {
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38 p = pathRewrite.rewrite(p);
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39 SoftReference<Path> sr = cache.get(p);
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40 Path path = sr == null ? null : sr.get();
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41 if (path == null) {
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42 path = Path.create(p);
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43 cache.put(p, new SoftReference<Path>(path));
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44 }
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45 return path;
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46 }
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47
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48 // XXX what would be parent of an empty path?
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49 // Path shall have similar functionality
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50 public Path parent(Path path) {
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51 if (path.length() == 0) {
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52 throw new IllegalArgumentException();
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53 }
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54 for (int i = path.length() - 2 /*if path represents a dir, trailing char is slash, skip*/; i >= 0; i--) {
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55 if (path.charAt(i) == '/') {
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56 return get(path.subSequence(0, i+1).toString(), true);
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57 }
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58 }
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59 return get("", true);
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60 }
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61
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62 private Path get(String p, boolean create) {
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63 SoftReference<Path> sr = cache.get(p);
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64 Path path = sr == null ? null : sr.get();
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65 if (path == null) {
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66 if (create) {
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67 path = Path.create(p);
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68 cache.put(p, new SoftReference<Path>(path));
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69 } else if (sr != null) {
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70 // cached path no longer used, clear cache entry - do not wait for RefQueue to step in
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71 cache.remove(p);
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72 }
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73 }
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74 return path;
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75 }
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76 }