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annotate src/org/tmatesoft/hg/core/HgFileInformer.java @ 248:3fbfce107f94

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Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 12 Aug 2011 18:48:57 +0200
parents
children 8c951645bea0
rev   line source
248
3fbfce107f94 Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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1 /*
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2 * Copyright (c) 2011 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 org.tmatesoft.hg.internal.ManifestRevision;
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20 import org.tmatesoft.hg.repo.HgDataFile;
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21 import org.tmatesoft.hg.repo.HgRepository;
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22 import org.tmatesoft.hg.util.Path;
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23
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24 /**
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25 * Primary purpose is to provide information about file revisions at specific changeset. Multiple {@link #check(Path)} calls
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26 * are possible once {@link #changeset(Nodeid)} (and optionally, {@link #followRenames(boolean)}) were set.
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public class HgFileInformer {
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32
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33 private final HgRepository repo;
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34 private boolean followRenames;
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35 private Nodeid cset;
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36 private ManifestRevision cachedManifest;
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37 private HgFileRevision fileRevision;
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38 private boolean checked, renamed;
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39
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40 public HgFileInformer(HgRepository hgRepo) {
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41 repo = hgRepo;
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42 }
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43
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44 public HgFileInformer changeset(Nodeid nid) {
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45 if (nid == null || Nodeid.NULL.equals(nid)) {
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46 throw new IllegalArgumentException();
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47 }
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48 cset = nid;
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49 cachedManifest = null;
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50 fileRevision = null;
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51 return this;
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52 }
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53
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54 public HgFileInformer followRenames(boolean follow) {
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55 followRenames = follow;
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56 fileRevision = null;
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57 return this;
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58 }
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59
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60 public boolean check(Path file) { // XXX IStatus instead of boolean?
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61 fileRevision = null;
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62 checked = false;
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63 renamed = false;
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64 if (cset == null || file == null || file.isDirectory()) {
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65 throw new IllegalArgumentException();
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66 }
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67 HgDataFile dataFile = repo.getFileNode(file);
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68 if (!dataFile.exists()) {
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69 return false;
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70 }
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71 if (cachedManifest == null) {
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72 int csetRev = repo.getChangelog().getLocalRevision(cset);
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73 cachedManifest = new ManifestRevision(null, null); // XXX how about context and cached manifest revisions
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74 repo.getManifest().walk(csetRev, csetRev, cachedManifest);
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75 // cachedManifest shall be meaningful - changelog.getLocalRevision above ensures we've got version that exists.
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76 }
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77 Nodeid toExtract = cachedManifest.nodeid(file.toString());
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78 try {
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79 if (toExtract == null && followRenames) {
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80 while (toExtract == null && dataFile.isCopy()) {
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81 renamed = true;
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82 file = dataFile.getCopySourceName();
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83 dataFile = repo.getFileNode(file);
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84 toExtract = cachedManifest.nodeid(file.toString());
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85 }
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86 }
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87 } catch (HgDataStreamException ex) {
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88 ex.printStackTrace(); // XXX log(INFO)
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89 // ignore now, however if there's IStatus retval, might report error with reasonable explanation.
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90 // Perhaps, may add a String reason() method with such info?
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91 }
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92 checked = true;
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93 if (toExtract != null) {
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94 fileRevision = new HgFileRevision(repo, toExtract, dataFile.getPath());
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95 return true;
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96 } // else String.format("File %s nor its origins were not known at repository %s revision", file, cset.shortNotation())
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97 return false;
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98 }
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99
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100 /**
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101 * @return result of the last {@link #check(Path)} call.
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102 */
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103 public boolean exists() {
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104 assertCheckRan();
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105 return fileRevision != null;
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106 }
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107
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108 /**
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109 * @return <code>true</code> if checked file was known by another name at the time of specified changeset.
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110 */
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111 public boolean hasAnotherName() {
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112 assertCheckRan();
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113 return renamed;
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114 }
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115
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116 /**
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117 * @return holder for file revision information
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118 */
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119 public HgFileRevision getFileRevision() {
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120 assertCheckRan();
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121 return fileRevision;
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122 }
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123
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124 /**
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125 * Name of the checked file as it was known at the time of the specified changeset.
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126 *
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127 * @return handy shortcut for <code>getFileRevision().getPath()</code>
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128 */
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129 public Path filename() {
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130 assertCheckRan();
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131 return fileRevision.getPath();
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132 }
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133
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134 /**
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135 * Revision of the checked file
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136 *
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137 * @return handy shortcut for <code>getFileRevision().getRevision()</code>
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138 */
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139 public Nodeid revision() {
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140 assertCheckRan();
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141 return fileRevision.getRevision();
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142 }
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143
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144 private void assertCheckRan() {
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145 if (!checked) {
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146 throw new HgBadStateException("Shall invoke #check(Path) first");
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147 }
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148 }
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149 }