Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/HgChangesetTreeHandler.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 a6435c1a42d0
children 6526d8adbc0f
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.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.util.Pair;
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24
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25 /**
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26 * Handler to iterate file history (generally, any revlog) with access to parent-child relations between changesets.
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27 *
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28 * @see HgLogCommand#execute(HgChangesetTreeHandler)
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 @Callback
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34 public interface HgChangesetTreeHandler {
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35 /**
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36 * @param entry access to various pieces of information about current tree node. Instances might be
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37 * reused across calls and shall not be kept by client's code
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38 * @throws HgCallbackTargetException wrapper for any exception user code may produce
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39 */
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40 public void treeElement(HgChangesetTreeHandler.TreeElement entry) throws HgCallbackTargetException;
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41
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42 interface TreeElement {
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43 /**
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44 * Revision of the revlog being iterated. For example, when walking file history, return value represents file revisions.
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45 *
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46 * @return revision of the revlog being iterated.
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47 */
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48 public Nodeid fileRevision();
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50 /**
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51 * File node, provided revlog being iterated is a {@link HgDataFile}; {@link #fileRevision()}
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52 * references revision from the history of this very {@link HgDataFile file}.
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53 *
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54 * Comes handy when file history with renames is being followed to find out
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55 * file name for particular revision in the history.
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56 *
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57 * @return instance of the file being walked, or <code>null</code> if it's not a file but other revlog.
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58 */
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59 public HgDataFile file();
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60
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61 /**
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62 * @return changeset associated with the current file revision
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63 */
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64 public HgChangeset changeset();
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66 /**
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67 * Lightweight alternative to {@link #changeset()}, identifies changeset in which current file node has been modified
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68 * @return changeset {@link Nodeid revision}
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69 */
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70 public Nodeid changesetRevision();
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71
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72 /**
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73 * Identifies parent changes, changesets where file/revlog in question was modified prior to change being visited.
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74 *
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75 * Note, these are not necessarily in direct relation to parents of changeset from {@link #changeset()}
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76 *
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77 * Imagine next history (grows from bottom to top):
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78 * <pre>
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79 * o A o
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80 * | \ |
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81 * o B \/
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82 * | o C
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83 * | /
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84 * o /
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85 * | /
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86 * o D
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87 * </pre>
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88 *
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89 * 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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90 * 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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91 * then this {@link #parents()} call would return pair with single element only, pointing to <code>D</code>
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92 *
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93 * @return changesets that correspond to parents of the current file node, either pair element may be <code>null</code>.
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94 */
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95 public Pair<HgChangeset, HgChangeset> parents();
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97 /**
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98 * Lightweight alternative to {@link #parents()}, give {@link Nodeid nodeids} only
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99 * @return two values, neither is <code>null</code>, use {@link Nodeid#isNull()} to identify parent not set
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100 */
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101 public Pair<Nodeid, Nodeid> parentRevisions();
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102
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103 /**
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104 * Changes that originate from the given change and bear it as their parent.
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105 * @return collection (possibly empty) of immediate children of the change
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106 */
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107 public Collection<HgChangeset> children();
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109 /**
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110 * Lightweight alternative to {@link #children()}.
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111 * @return never <code>null</code>
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112 */
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113 public Collection<Nodeid> childRevisions();
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114 }
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115 }