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annotate src/org/tmatesoft/hg/internal/ChangelogMonitor.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 6526d8adbc0f
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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 org.tmatesoft.hg.core.Nodeid;
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20 import org.tmatesoft.hg.core.SessionContext;
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21 import org.tmatesoft.hg.repo.HgRepository;
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22 import org.tmatesoft.hg.repo.HgRuntimeException;
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23
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24 /**
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25 * Track changes to a repository based on recent changelog revision.
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26 * TODO shall be merged with {@link RevlogChangeMonitor} and {@link FileChangeMonitor} into
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27 * a single facility available from {@link SessionContext}
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 public class ChangelogMonitor {
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33 private final HgRepository repo;
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34 private int changelogRevCount = -1;
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35 private Nodeid changelogLastRev = null;
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37 public ChangelogMonitor(HgRepository hgRepo) {
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38 repo = hgRepo;
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39 }
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41 // memorize the state of the repository's changelog
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42 public void touch() throws HgRuntimeException {
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43 changelogRevCount = repo.getChangelog().getRevisionCount();
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44 changelogLastRev = safeGetRevision(changelogRevCount-1);
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45 }
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46
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47 // if present state doesn't match the one we remember
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48 public boolean isChanged() throws HgRuntimeException {
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49 int rc = repo.getChangelog().getRevisionCount();
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50 if (rc != changelogRevCount) {
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51 return true;
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52 }
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53 Nodeid r = safeGetRevision(rc-1);
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54 return !r.equals(changelogLastRev);
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55 }
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56
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57 // handles empty repository case
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58 private Nodeid safeGetRevision(int revIndex) throws HgRuntimeException {
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59 if (revIndex >= 0) {
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60 return repo.getChangelog().getRevision(revIndex);
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61 }
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62 return Nodeid.NULL;
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63 }
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64 }