annotate src/org/tmatesoft/hg/core/HgChangesetTreeHandler.java @ 696:5b5d199e2eb3

Replaced ganymed ssh2 library with trilead
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 05 Aug 2013 19:03:22 +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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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 }