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annotate src/org/tmatesoft/hg/core/ChangesetTransformer.java @ 628:6526d8adbc0f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 22 May 2013 15:52:31 +0200
parents 1ee452f31187
children
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1 /*
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2 * Copyright (c) 2011-2013 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.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.HgRuntimeException;
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28 import org.tmatesoft.hg.repo.HgStatusCollector;
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29 import org.tmatesoft.hg.repo.HgParentChildMap;
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30 import org.tmatesoft.hg.util.Adaptable;
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31 import org.tmatesoft.hg.util.CancelSupport;
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32 import org.tmatesoft.hg.util.CancelledException;
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33 import org.tmatesoft.hg.util.PathRewrite;
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34 import org.tmatesoft.hg.util.ProgressSupport;
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35
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36 /**
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37 * Bridges {@link HgChangelog.RawChangeset} with high-level {@link HgChangeset} API
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38 * 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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39 *
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 /*package-local*/ class ChangesetTransformer implements HgChangelog.Inspector, Adaptable {
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44 private final HgChangesetHandler handler;
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45 private final LifecycleBridge lifecycleBridge;
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46 private final Transformation t;
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47 private Set<String> branches;
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48 private HgCallbackTargetException failure;
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49
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50 // repo and delegate can't be null, parent walker can
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51 // ps and cs can't be null
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52 public ChangesetTransformer(HgRepository hgRepo, HgChangesetHandler delegate, HgParentChildMap<HgChangelog> pw, ProgressSupport ps, CancelSupport cs) {
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53 if (hgRepo == null || delegate == null) {
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54 throw new IllegalArgumentException();
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55 }
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56 if (ps == null || cs == null) {
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57 throw new IllegalArgumentException();
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58 }
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59 HgStatusCollector statusCollector = new HgStatusCollector(hgRepo);
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60 t = new Transformation(statusCollector, pw);
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61 handler = delegate;
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62 // lifecycleBridge takes care of progress and cancellation, plus
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63 // gives us explicit way to stop iteration (once HgCallbackTargetException) comes.
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64 lifecycleBridge = new LifecycleBridge(ps, cs);
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65 }
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66
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67 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) throws HgRuntimeException {
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68 if (branches != null && !branches.contains(cset.branch())) {
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69 return;
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70 }
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71
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72 HgChangeset changeset = t.handle(revisionNumber, nodeid, cset);
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73 try {
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74 handler.cset(changeset);
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75 lifecycleBridge.nextStep();
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76 } catch (HgCallbackTargetException ex) {
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77 failure = ex.setRevision(nodeid).setRevisionIndex(revisionNumber);
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78 lifecycleBridge.stop();
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79 }
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80 }
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82 public void checkFailure() throws HgCallbackTargetException, CancelledException {
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83 if (failure != null) {
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84 HgCallbackTargetException toThrow = failure;
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85 throw toThrow;
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86 }
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87 if (lifecycleBridge.isCancelled()) {
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88 CancelledException toThrow = lifecycleBridge.getCancelOrigin();
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89 assert toThrow != null;
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90 throw toThrow;
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91 }
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92 }
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93
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94 public void limitBranches(Set<String> branches) {
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95 this.branches = branches;
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96 }
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98 // part relevant to RawChangeset->HgChangeset transformation
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99 static class Transformation {
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100 private final HgChangeset changeset;
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101
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102 public Transformation(HgStatusCollector statusCollector, HgParentChildMap<HgChangelog> pw) {
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103 // files listed in a changeset don't need their names to be rewritten (they are normalized already)
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104 // pp serves as a cache for all filenames encountered and as a source for Path listed in the changeset
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105 PathPool pp = new PathPool(new PathRewrite.Empty());
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106 statusCollector.setPathPool(pp);
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107 changeset = new HgChangeset(statusCollector, pp);
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108 changeset.setParentHelper(pw);
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109 }
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110
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111 /**
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112 * Callers shall not assume they get new HgChangeset instance each time, implementation may reuse instances.
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113 * @return hi-level changeset description
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114 */
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115 HgChangeset handle(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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116 changeset.init(revisionNumber, nodeid, cset);
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117 return changeset;
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118 }
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119 }
423
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120
520
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121 public <T> T getAdapter(Class<T> adapterClass) {
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122 if (adapterClass == Lifecycle.class) {
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123 return adapterClass.cast(lifecycleBridge);
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124 }
520
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125 // just in case there are more adapters in future
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126 return Adaptable.Factory.getAdapter(handler, adapterClass, null);
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127 }
192
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128 }