Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/ChangesetTransformer.java @ 430:d280759c2a3f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
branch information is not directly related to dirstate, clean API from this dependency
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 29 Mar 2012 18:48:23 +0200
parents 31a89587eb04
children 12f668401613
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.repo.HgChangelog;
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22 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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23 import org.tmatesoft.hg.repo.HgRepository;
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24 import org.tmatesoft.hg.repo.HgStatusCollector;
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25 import org.tmatesoft.hg.util.Adaptable;
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26 import org.tmatesoft.hg.util.CancelSupport;
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27 import org.tmatesoft.hg.util.CancelledException;
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28 import org.tmatesoft.hg.util.PathPool;
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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 PathPool pp = new PathPool(new PathRewrite.Empty());
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107 statusCollector.setPathPool(pp);
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108 changeset = new HgChangeset(statusCollector, pp);
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109 changeset.setParentHelper(pw);
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110 }
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111
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112 /**
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113 * Callers shall not assume they get new HgChangeset instance each time, implementation may reuse instances.
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114 * @return hi-level changeset description
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115 */
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116 HgChangeset handle(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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117 changeset.init(revisionNumber, nodeid, cset);
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118 return changeset;
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119 }
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120 }
423
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121
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122 public void checkCancelled() throws CancelledException {
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123 if (failure != null || cancellation != null) {
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124 // stop HgChangelog.Iterator. Our exception is for the purposes of cancellation only,
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125 // the one we have stored (this.cancellation) is for user
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126 throw new CancelledException();
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127 }
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128 }
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129
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130 public <T> T getAdapter(Class<T> adapterClass) {
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131 if (adapterClass == ProgressSupport.class) {
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132 return adapterClass.cast(progressHelper);
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133 }
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134 return null;
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135 }
192
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136 }