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annotate src/org/tmatesoft/hg/core/ChangesetTransformer.java @ 520:1ee452f31187

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Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 21 Dec 2012 21:20:26 +0100
parents 1fc0da631200
children 6526d8adbc0f
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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.core;
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18
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19 import java.util.Set;
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20
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21 import org.tmatesoft.hg.internal.Lifecycle;
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22 import org.tmatesoft.hg.internal.LifecycleBridge;
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23 import org.tmatesoft.hg.internal.PathPool;
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24 import org.tmatesoft.hg.repo.HgChangelog;
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25 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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26 import org.tmatesoft.hg.repo.HgRepository;
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27 import org.tmatesoft.hg.repo.HgStatusCollector;
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28 import org.tmatesoft.hg.repo.HgParentChildMap;
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29 import org.tmatesoft.hg.util.Adaptable;
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30 import org.tmatesoft.hg.util.CancelSupport;
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31 import org.tmatesoft.hg.util.CancelledException;
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32 import org.tmatesoft.hg.util.PathRewrite;
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33 import org.tmatesoft.hg.util.ProgressSupport;
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34
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35 /**
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36 * Bridges {@link HgChangelog.RawChangeset} with high-level {@link HgChangeset} API
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37 * TODO post-1.0 Move to .internal once access to package-local HgChangeset cons is resolved. For 1.0, enough it's package-local
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38 *
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 /*package-local*/ class ChangesetTransformer implements HgChangelog.Inspector, Adaptable {
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43 private final HgChangesetHandler handler;
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44 private final LifecycleBridge lifecycleBridge;
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45 private final Transformation t;
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46 private Set<String> branches;
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47 private HgCallbackTargetException failure;
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48
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49 // repo and delegate can't be null, parent walker can
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50 // ps and cs can't be null
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51 public ChangesetTransformer(HgRepository hgRepo, HgChangesetHandler delegate, HgParentChildMap<HgChangelog> pw, ProgressSupport ps, CancelSupport cs) {
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52 if (hgRepo == null || delegate == null) {
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53 throw new IllegalArgumentException();
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54 }
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55 if (ps == null || cs == null) {
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56 throw new IllegalArgumentException();
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57 }
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58 HgStatusCollector statusCollector = new HgStatusCollector(hgRepo);
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59 t = new Transformation(statusCollector, pw);
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60 handler = delegate;
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61 // lifecycleBridge takes care of progress and cancellation, plus
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62 // gives us explicit way to stop iteration (once HgCallbackTargetException) comes.
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63 lifecycleBridge = new LifecycleBridge(ps, cs);
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64 }
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65
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66 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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67 if (branches != null && !branches.contains(cset.branch())) {
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68 return;
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69 }
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70
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71 HgChangeset changeset = t.handle(revisionNumber, nodeid, cset);
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72 try {
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73 handler.cset(changeset);
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74 lifecycleBridge.nextStep();
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75 } catch (HgCallbackTargetException ex) {
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76 failure = ex.setRevision(nodeid).setRevisionIndex(revisionNumber);
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77 lifecycleBridge.stop();
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78 }
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79 }
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81 public void checkFailure() throws HgCallbackTargetException, CancelledException {
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82 if (failure != null) {
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83 HgCallbackTargetException toThrow = failure;
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84 throw toThrow;
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85 }
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86 if (lifecycleBridge.isCancelled()) {
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87 CancelledException toThrow = lifecycleBridge.getCancelOrigin();
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88 assert toThrow != null;
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89 throw toThrow;
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90 }
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91 }
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92
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93 public void limitBranches(Set<String> branches) {
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94 this.branches = branches;
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95 }
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96
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97 // part relevant to RawChangeset->HgChangeset transformation
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98 static class Transformation {
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99 private final HgChangeset changeset;
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100
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101 public Transformation(HgStatusCollector statusCollector, HgParentChildMap<HgChangelog> pw) {
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102 // files listed in a changeset don't need their names to be rewritten (they are normalized already)
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103 // pp serves as a cache for all filenames encountered and as a source for Path listed in the changeset
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104 PathPool pp = new PathPool(new PathRewrite.Empty());
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105 statusCollector.setPathPool(pp);
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106 changeset = new HgChangeset(statusCollector, pp);
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107 changeset.setParentHelper(pw);
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108 }
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110 /**
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111 * Callers shall not assume they get new HgChangeset instance each time, implementation may reuse instances.
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112 * @return hi-level changeset description
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113 */
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114 HgChangeset handle(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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115 changeset.init(revisionNumber, nodeid, cset);
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116 return changeset;
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117 }
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118 }
423
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119
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120 public <T> T getAdapter(Class<T> adapterClass) {
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121 if (adapterClass == Lifecycle.class) {
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122 return adapterClass.cast(lifecycleBridge);
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123 }
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124 // just in case there are more adapters in future
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125 return Adaptable.Factory.getAdapter(handler, adapterClass, null);
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126 }
192
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127 }