Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgChangesetTreeHandler.java @ 647:c75297c17867

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Location of repository files as enumeration, use file constants instead of plain names
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 25 Jun 2013 18:53:18 +0200
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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.Collection;
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20
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21 import org.tmatesoft.hg.internal.Callback;
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22 import org.tmatesoft.hg.repo.HgDataFile;
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23 import org.tmatesoft.hg.repo.HgRuntimeException;
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24 import org.tmatesoft.hg.util.Pair;
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25
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26 /**
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27 * Handler to iterate file history (generally, any revlog) with access to parent-child relations between changesets.
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28 *
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29 * @see HgLogCommand#execute(HgChangesetTreeHandler)
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 @Callback
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35 public interface HgChangesetTreeHandler {
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36 /**
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37 * @param entry access to various pieces of information about current tree node. Instances might be
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38 * reused across calls and shall not be kept by client's code
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39 * @throws HgCallbackTargetException wrapper for any exception user code may produce
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40 * @throws HgRuntimeException propagates library issues. <em>Runtime exception</em>
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41 */
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42 public void treeElement(HgChangesetTreeHandler.TreeElement entry) throws HgCallbackTargetException, HgRuntimeException;
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43
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44 interface TreeElement {
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45 /**
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46 * Revision of the revlog being iterated. For example, when walking file history, return value represents file revisions.
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47 *
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48 * @return revision of the revlog being iterated.
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49 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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50 */
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51 public Nodeid fileRevision() throws HgRuntimeException;
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53 /**
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54 * File node, provided revlog being iterated is a {@link HgDataFile}; {@link #fileRevision()}
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55 * references revision from the history of this very {@link HgDataFile file}.
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56 *
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57 * Comes handy when file history with renames is being followed to find out
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58 * file name for particular revision in the history.
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59 *
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60 * @return instance of the file being walked, or <code>null</code> if it's not a file but other revlog.
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61 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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62 */
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63 public HgDataFile file() throws HgRuntimeException;
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64
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65 /**
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66 * @return changeset associated with the current file revision
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67 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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68 */
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69 public HgChangeset changeset() throws HgRuntimeException;
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71 /**
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72 * Lightweight alternative to {@link #changeset()}, identifies changeset in which current file node has been modified
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73 * @return changeset {@link Nodeid revision}
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74 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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75 */
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76 public Nodeid changesetRevision() throws HgRuntimeException;
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77
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78 /**
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79 * Identifies parent changes, changesets where file/revlog in question was modified prior to change being visited.
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80 *
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81 * Note, these are not necessarily in direct relation to parents of changeset from {@link #changeset()}
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82 *
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83 * Imagine next history (grows from bottom to top):
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84 * <pre>
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85 * o A o
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86 * | \ |
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87 * o B \/
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88 * | o C
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89 * | /
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90 * o /
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91 * | /
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92 * o D
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93 * </pre>
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94 *
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95 * When we are at {@link TreeElement} for <code>A</code>, <code>B</code> and <code>C</code> are changeset parents, naturally. However
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96 * if the file/revlog we've been walking has not been changed in <code>B</code> and <code>C</code>, but e.g. in <code>D</code> only,
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97 * then this {@link #parents()} call would return pair with single element only, pointing to <code>D</code>
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98 *
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99 * @return changesets that correspond to parents of the current file node, either pair element may be <code>null</code>.
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100 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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101 */
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102 public Pair<HgChangeset, HgChangeset> parents() throws HgRuntimeException;
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104 /**
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105 * Lightweight alternative to {@link #parents()}, give {@link Nodeid nodeids} only
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106 * @return two values, neither is <code>null</code>, use {@link Nodeid#isNull()} to identify parent not set
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107 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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108 */
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109 public Pair<Nodeid, Nodeid> parentRevisions() throws HgRuntimeException;
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110
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111 /**
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112 * Changes that originate from the given change and bear it as their parent.
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113 * @return collection (possibly empty) of immediate children of the change
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114 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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115 */
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116 public Collection<HgChangeset> children() throws HgRuntimeException;
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118 /**
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119 * Lightweight alternative to {@link #children()}.
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120 * @return never <code>null</code>
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121 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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122 */
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123 public Collection<Nodeid> childRevisions() throws HgRuntimeException;
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124 }
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125 }