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annotate src/org/tmatesoft/hg/util/PathPool.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents a415fe296a50
children
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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
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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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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).toString();
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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 // TODO unify with Pool<Path>
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45 public Path path(Path p) {
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46 String s = pathRewrite.rewrite(p).toString();
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47 Path cached = get(s, false);
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48 if (cached == null) {
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49 cache.put(s, new SoftReference<Path>(cached = p));
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50 }
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51 return cached;
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52 }
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54 // XXX what would be parent of an empty path?
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55 // Path shall have similar functionality
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56 public Path parent(Path path) {
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57 if (path.length() == 0) {
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58 throw new IllegalArgumentException();
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59 }
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60 for (int i = path.length() - 2 /*if path represents a dir, trailing char is slash, skip*/; i >= 0; i--) {
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61 if (path.charAt(i) == '/') {
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62 return get(path.subSequence(0, i+1).toString(), true);
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63 }
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64 }
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65 return get("", true);
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66 }
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68 // invoke when path pool is no longer in use, to ease gc work
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69 public void clear() {
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70 cache.clear();
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71 }
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73 private Path get(String p, boolean create) {
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74 SoftReference<Path> sr = cache.get(p);
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75 Path path = sr == null ? null : sr.get();
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76 if (path == null) {
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77 if (create) {
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78 path = Path.create(p);
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79 cache.put(p, new SoftReference<Path>(path));
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80 } else if (sr != null) {
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81 // cached path no longer used, clear cache entry - do not wait for RefQueue to step in
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82 cache.remove(p);
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83 }
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84 }
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85 return path;
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86 }
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87 }