Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/RevlogChangeMonitor.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
rev   line source
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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.util.WeakHashMap;
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21
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22 /**
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23 * Detect changes to revlog files. Not a general file change monitoring as we utilize the fact revlogs are append-only (and even in case
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24 * of stripped-off tail revisions, with e.g. mq, detection approach is still valid).
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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 RevlogChangeMonitor {
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31 private final WeakHashMap<File, Long> lastKnownSize;
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32 private final WeakHashMap<File, Long> lastKnownTime;
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33 private final File soleFile;
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34 private long soleFileSize = -1;
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35 private long soleFileTime = -1;
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36
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37 // use single for multiple files. TODO [1.2] repository/session context shall provide
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38 // alternative (configurable) implementations, so that Java7 users may supply better one
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39 public RevlogChangeMonitor() {
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40 lastKnownSize = new WeakHashMap<File, Long>();
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41 lastKnownTime= new WeakHashMap<File, Long>();
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42 soleFile = null;
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43 }
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45 public RevlogChangeMonitor(File f) {
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46 assert f != null;
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47 lastKnownSize = lastKnownTime = null;
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48 soleFile = f;
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49 }
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51 public void touch(File f) {
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52 assert f != null;
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53 if (lastKnownSize == null) {
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54 assert f == soleFile;
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55 soleFileSize = f.length();
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56 soleFileTime = f.lastModified();
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57 } else {
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58 lastKnownSize.put(f, f.length());
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59 lastKnownTime.put(f, f.lastModified());
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60 }
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61 }
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63 public boolean hasChanged(File f) {
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64 assert f != null;
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65 if (lastKnownSize == null) {
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66 assert f == soleFile;
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67 return soleFileSize != f.length() || soleFileTime != f.lastModified();
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68 } else {
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69 Long lastSize = lastKnownSize.get(f);
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70 Long lastTime = lastKnownTime.get(f);
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71 if (lastSize == null || lastTime == null) {
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72 return true;
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73 }
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74 return f.length() != lastSize || f.lastModified() != lastTime;
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75 }
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76 }
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77 }