Mercurial > jhg

annotate src/org/tmatesoft/hg/core/ChangesetTransformer.java @ 515:e6c8b9b654b2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Provide access to HgDataFile being iterated into HgChangesetTreeHandler.TreeElement to give context for renamed files
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 17 Dec 2012 20:51:12 +0100
parents 1fc0da631200
children 1ee452f31187
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.repo.HgParentChildMap;
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27 import org.tmatesoft.hg.util.Adaptable;
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28 import org.tmatesoft.hg.util.CancelSupport;
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29 import org.tmatesoft.hg.util.CancelledException;
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30 import org.tmatesoft.hg.util.PathRewrite;
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31 import org.tmatesoft.hg.util.ProgressSupport;
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32
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33 /**
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34 * Bridges {@link HgChangelog.RawChangeset} with high-level {@link HgChangeset} API
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35 * 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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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 /*package-local*/ class ChangesetTransformer implements HgChangelog.Inspector, Adaptable, CancelSupport {
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41 private final HgChangesetHandler handler;
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42 private final ProgressSupport progressHelper;
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43 private final CancelSupport cancelHelper;
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44 private final Transformation t;
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45 private Set<String> branches;
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46 private HgCallbackTargetException failure;
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47 private CancelledException cancellation;
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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 // we let HgChangelog#range deal with progress (pipe through getAdapter)
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62 // but use own cancellation (which involves CallbackTargetException as well, and preserves original cancellation
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63 // exception in case clients care)
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64 cancelHelper = cs;
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65 progressHelper = ps;
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66 }
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67
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68 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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69 if (branches != null && !branches.contains(cset.branch())) {
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70 return;
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71 }
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72
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73 HgChangeset changeset = t.handle(revisionNumber, nodeid, cset);
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74 try {
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75 handler.cset(changeset);
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76 cancelHelper.checkCancelled();
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77 } catch (HgCallbackTargetException ex) {
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78 failure = ex.setRevision(nodeid).setRevisionIndex(revisionNumber);
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79 } catch (CancelledException ex) {
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80 cancellation = ex;
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81 }
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82 }
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84 public void checkFailure() throws HgCallbackTargetException, CancelledException {
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85 if (failure != null) {
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86 HgCallbackTargetException toThrow = failure;
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87 failure = null; // just in (otherwise unexpected) case this instance would get reused
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88 throw toThrow;
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89 }
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90 if (cancellation != null) {
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91 CancelledException toThrow = cancellation;
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92 cancellation = null;
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93 throw toThrow;
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94 }
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95 }
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96
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97 public void limitBranches(Set<String> branches) {
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98 this.branches = branches;
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99 }
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101 // part relevant to RawChangeset->HgChangeset transformation
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102 static class Transformation {
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103 private final HgChangeset changeset;
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104
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105 public Transformation(HgStatusCollector statusCollector, HgParentChildMap<HgChangelog> pw) {
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106 // files listed in a changeset don't need their names to be rewritten (they are normalized already)
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107 // pp serves as a cache for all filenames encountered and as a source for Path listed in the changeset
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108 PathPool pp = new PathPool(new PathRewrite.Empty());
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109 statusCollector.setPathPool(pp);
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110 changeset = new HgChangeset(statusCollector, pp);
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111 changeset.setParentHelper(pw);
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112 }
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114 /**
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115 * Callers shall not assume they get new HgChangeset instance each time, implementation may reuse instances.
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116 * @return hi-level changeset description
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117 */
328
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118 HgChangeset handle(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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119 changeset.init(revisionNumber, nodeid, cset);
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120 return changeset;
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121 }
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122 }
423
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123
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124 public void checkCancelled() throws CancelledException {
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125 if (failure != null || cancellation != null) {
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126 // stop HgChangelog.Iterator. Our exception is for the purposes of cancellation only,
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127 // the one we have stored (this.cancellation) is for user
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128 throw new CancelledException();
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129 }
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130 }
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131
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132 public <T> T getAdapter(Class<T> adapterClass) {
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133 if (adapterClass == ProgressSupport.class) {
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134 return adapterClass.cast(progressHelper);
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135 }
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136 return null;
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137 }
192
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138 }