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annotate src/org/tmatesoft/hg/internal/RevlogDelegate.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 053bb4397bf9
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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18
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19 import org.tmatesoft.hg.core.Nodeid;
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20 import org.tmatesoft.hg.internal.RevlogStream.Inspector;
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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 * Does almost nothing, facilitates chains of inspectors and sharing certain information between them
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26 *
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27 * @author Artem Tikhomirov
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28 * @author TMate Software Ltd.
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29 */
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30 public abstract class RevlogDelegate implements RevlogStream.Inspector {
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31
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32 private final Inspector next;
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33 private Nodeid nid;
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34 private final RevlogDelegate nextAsRD;
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35
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36 protected RevlogDelegate(RevlogStream.Inspector nextInChain) {
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37 next = nextInChain;
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38 if (nextInChain instanceof RevlogDelegate) {
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39 // additional benefits
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40 nextAsRD = (RevlogDelegate) nextInChain;
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41 } else {
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42 nextAsRD = 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 * iterates index only and ensures pre/post processing is invoked for the chain
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48 */
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49 public void walk(HgRepository hgRepo, RevlogStream stream, int from, int to) {
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50 // hgRepo is handy for present uses, but is generally not appropriate,
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51 // it's ok to refactor and let subclasses get what they need through e.g. a cons
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52 stream.iterate(from, to, false, this);
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53 postWalk(hgRepo);
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54 }
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55
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56 // does nothing but gives a chance to delegate to handle the same
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57 protected void postWalk(HgRepository hgRepo) {
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58 if (nextAsRD != null) {
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59 nextAsRD.postWalk(hgRepo);
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60 }
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61 }
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62
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63 /**
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64 * @return Nodeid of current revision if already known, or a new instance otherwise.
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65 * The value will propagate to subsequent {@link RevlogDelegate RevlogDelegates}, if any
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66 */
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67 protected Nodeid getRevision(byte[] nodeid) {
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68 if (nid == null) {
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69 nid = Nodeid.fromBinary(nodeid, 0);
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70 }
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71 return nid;
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72 }
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73
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74 protected void setRevision(Nodeid nodeid) {
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75 nid = nodeid;
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76 }
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77
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78 public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) throws HgRuntimeException {
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79 if (next != null) {
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80 if (nextAsRD != null) {
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81 nextAsRD.setRevision(nid); // null is fine
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82 }
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83 next.next(revisionIndex, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeid, data);
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84 }
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85 nid = null; // forget it, get ready for the next iteration
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86 }
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87 }