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annotate src/org/tmatesoft/hg/internal/RevlogDelegate.java @ 695:053bb4397bf9

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Refactoring: nice Revlog.indexWalk() implementation
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 05 Aug 2013 18:45:16 +0200
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053bb4397bf9 Refactoring: nice Revlog.indexWalk() implementation
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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 }