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annotate src/org/tmatesoft/hg/core/ChangesetTransformer.java @ 431:12f668401613

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FIXMEs: awkward API refactored, what need to be internal got hidden; public aspects got captured in slim interfaces
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 29 Mar 2012 20:54:04 +0200
parents 31a89587eb04
children 1fc0da631200
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.PathPool;
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22 import org.tmatesoft.hg.repo.HgChangelog;
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23 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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24 import org.tmatesoft.hg.repo.HgRepository;
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25 import org.tmatesoft.hg.repo.HgStatusCollector;
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26 import org.tmatesoft.hg.util.Adaptable;
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27 import org.tmatesoft.hg.util.CancelSupport;
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28 import org.tmatesoft.hg.util.CancelledException;
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29 import org.tmatesoft.hg.util.PathRewrite;
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30 import org.tmatesoft.hg.util.ProgressSupport;
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31
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32 /**
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33 * Bridges {@link HgChangelog.RawChangeset} with high-level {@link HgChangeset} API
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34 * 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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35 *
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36 * @author Artem Tikhomirov
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37 * @author TMate Software Ltd.
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38 */
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39 /*package-local*/ class ChangesetTransformer implements HgChangelog.Inspector, Adaptable, CancelSupport {
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40 private final HgChangesetHandler handler;
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41 private final ProgressSupport progressHelper;
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42 private final CancelSupport cancelHelper;
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43 private final Transformation t;
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44 private Set<String> branches;
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45 private HgCallbackTargetException failure;
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46 private CancelledException cancellation;
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47
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48 // repo and delegate can't be null, parent walker can
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49 // ps and cs can't be null
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50 public ChangesetTransformer(HgRepository hgRepo, HgChangesetHandler delegate, HgChangelog.ParentWalker pw, ProgressSupport ps, CancelSupport cs) {
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51 if (hgRepo == null || delegate == null) {
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52 throw new IllegalArgumentException();
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53 }
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54 if (ps == null || cs == null) {
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55 throw new IllegalArgumentException();
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56 }
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57 HgStatusCollector statusCollector = new HgStatusCollector(hgRepo);
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58 t = new Transformation(statusCollector, pw);
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59 handler = delegate;
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60 // we let HgChangelog#range deal with progress (pipe through getAdapter)
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61 // but use own cancellation (which involves CallbackTargetException as well, and preserves original cancellation
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62 // exception in case clients care)
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63 cancelHelper = cs;
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64 progressHelper = ps;
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65 }
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66
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67 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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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 cancelHelper.checkCancelled();
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76 } catch (HgCallbackTargetException ex) {
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77 failure = ex.setRevision(nodeid).setRevisionIndex(revisionNumber);
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78 } catch (CancelledException ex) {
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79 cancellation = ex;
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80 }
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81 }
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82
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83 public void checkFailure() throws HgCallbackTargetException, CancelledException {
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84 if (failure != null) {
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85 HgCallbackTargetException toThrow = failure;
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86 failure = null; // just in (otherwise unexpected) case this instance would get reused
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87 throw toThrow;
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88 }
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89 if (cancellation != null) {
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90 CancelledException toThrow = cancellation;
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91 cancellation = null;
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92 throw toThrow;
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93 }
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94 }
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95
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96 public void limitBranches(Set<String> branches) {
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97 this.branches = branches;
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98 }
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99
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100 // part relevant to RawChangeset->HgChangeset transformation
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101 static class Transformation {
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102 private final HgChangeset changeset;
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103
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104 public Transformation(HgStatusCollector statusCollector, HgChangelog.ParentWalker pw) {
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105 // files listed in a changeset don't need their names to be rewritten (they are normalized already)
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106 // pp serves as a cache for all filenames encountered and as a source for Path listed in the changeset
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107 PathPool pp = new PathPool(new PathRewrite.Empty());
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108 statusCollector.setPathPool(pp);
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109 changeset = new HgChangeset(statusCollector, pp);
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110 changeset.setParentHelper(pw);
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111 }
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112
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113 /**
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114 * Callers shall not assume they get new HgChangeset instance each time, implementation may reuse instances.
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115 * @return hi-level changeset description
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116 */
328
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117 HgChangeset handle(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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118 changeset.init(revisionNumber, nodeid, cset);
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119 return changeset;
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120 }
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121 }
423
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122
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123 public void checkCancelled() throws CancelledException {
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124 if (failure != null || cancellation != null) {
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125 // stop HgChangelog.Iterator. Our exception is for the purposes of cancellation only,
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126 // the one we have stored (this.cancellation) is for user
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127 throw new CancelledException();
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128 }
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129 }
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130
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131 public <T> T getAdapter(Class<T> adapterClass) {
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132 if (adapterClass == ProgressSupport.class) {
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133 return adapterClass.cast(progressHelper);
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134 }
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135 return null;
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136 }
192
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137 }