Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/RevlogDelegate.java @ 701:02766745dbe6
Added tag v1.2m2 for changeset 6e7786086f77
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 08 Aug 2013 21:05:21 +0200 |
parents | 053bb4397bf9 |
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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 } |