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annotate src/org/tmatesoft/hg/internal/RevlogStreamFactory.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 99ad1e3a4e4d
children
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1 /*
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2 * Copyright (c) 2013 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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19 import java.io.File;
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20 import java.lang.ref.SoftReference;
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21 import java.util.HashMap;
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22
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23 import org.tmatesoft.hg.util.Path;
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24
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25 /**
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26 * Factory to create {@link RevlogStream RevlogStreams}, cache-capable.
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public final class RevlogStreamFactory {
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32
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33 private final Internals repo;
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34 private final HashMap<Path, SoftReference<RevlogStream>> streamsCache;
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37 public RevlogStreamFactory(Internals hgRepo, boolean shallCacheRevlogs) {
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38 repo = hgRepo;
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39 if (shallCacheRevlogs) {
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40 streamsCache = new HashMap<Path, SoftReference<RevlogStream>>();
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41 } else {
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42 streamsCache = null;
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43 }
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44 }
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45
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46 /**
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47 * Creates a stream for specified file, doesn't cache stream
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48 */
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49 /*package-local*/ RevlogStream create(File f) {
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50 return new RevlogStream(repo, f);
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51 }
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52
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53 /**
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54 * Perhaps, should be separate interface, like ContentLookup
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55 * @param path - normalized file name
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56 * @return <code>null</code> if path doesn't resolve to a existing file
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57 */
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58 /*package-local*/ RevlogStream getStoreFile(Path path, boolean onlyIfExists) {
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59 final SoftReference<RevlogStream> ref = shallCacheRevlogs() ? streamsCache.get(path) : null;
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60 RevlogStream cached = ref == null ? null : ref.get();
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61 if (cached != null) {
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62 return cached;
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63 }
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64 File f = repo.getFileFromDataDir(path);
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65 if (!onlyIfExists || f.exists()) {
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66 RevlogStream s = create(f);
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67 if (shallCacheRevlogs()) {
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68 streamsCache.put(path, new SoftReference<RevlogStream>(s));
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69 }
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70 return s;
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71 }
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72 return null;
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73 }
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74
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75 private boolean shallCacheRevlogs() {
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76 return streamsCache != null;
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77 }
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78 }