File UnifiedDiffBlock.java
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Classes
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| UnifiedDiffBlock | 34 | 23 | 0% | 9 | 0 |
Contributing tests
This file is covered by 12 tests.
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| 1 | /* | |
| 2 | * See the NOTICE file distributed with this work for additional | |
| 3 | * information regarding copyright ownership. | |
| 4 | * | |
| 5 | * This is free software; you can redistribute it and/or modify it | |
| 6 | * under the terms of the GNU Lesser General Public License as | |
| 7 | * published by the Free Software Foundation; either version 2.1 of | |
| 8 | * the License, or (at your option) any later version. | |
| 9 | * | |
| 10 | * This software is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | * Lesser General Public License for more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU Lesser General Public | |
| 16 | * License along with this software; if not, write to the Free | |
| 17 | * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
| 18 | * 02110-1301 USA, or see the FSF site: http://www.fsf.org. | |
| 19 | */ | |
| 20 | package org.xwiki.diff.display; | |
| 21 | ||
| 22 | import java.util.ArrayList; | |
| 23 | ||
| 24 | /** | |
| 25 | * Represents a list of {@link UnifiedDiffElement}s that share the same context. The context is defined based on the | |
| 26 | * distance between changes. Changes that are close to each other are grouped in a single block. A block can contain | |
| 27 | * both added and removed elements. Blocks also contain unmodified elements that put changes in context. | |
| 28 | * | |
| 29 | * @param <E> the type of elements that are compared to produce the first level diff | |
| 30 | * @param <F> the type of sub-element that are compared to produce the second level diff | |
| 31 | * @version $Id: 0f7fdf1cab8e970df67f1f66cdd9647c50104aec $ | |
| 32 | * @since 4.1RC1 | |
| 33 | */ | |
| 34 | public class UnifiedDiffBlock<E, F> extends ArrayList<UnifiedDiffElement<E, F>> | |
| 35 | { | |
| 36 | /** | |
| 37 | * Needed for serialization. | |
| 38 | */ | |
| 39 | private static final long serialVersionUID = 1L; | |
| 40 | ||
| 41 | /** | |
| 42 | * @return the index where this block starts in the previous version; since blocks are most of the time not empty, | |
| 43 | * the returned value is the index of the first unmodified or removed element in this group | |
| 44 | */ | |
| 45 | 21 |  public int getPreviousStart() |
| 46 | { | |
| 47 | 21 | for (UnifiedDiffElement<E, F> element : this) { |
| 48 | 23 | if (!element.isAdded()) { |
| 49 | 20 | return element.getIndex(); |
| 50 | } | |
| 51 | } | |
| 52 | 1 | return 0; |
| 53 | } | |
| 54 | ||
| 55 | /** | |
| 56 | * @return the size of this block (number of elements) in the previous version; unmodified elements and elements | |
| 57 | * marked as removed are counted only | |
| 58 | */ | |
| 59 | 21 | public int getPreviousSize() |
| 60 | { | |
| 61 | 21 | int size = 0; |
| 62 | 21 | for (UnifiedDiffElement<E, F> element : this) { |
| 63 | 104 | if (!element.isAdded()) { |
| 64 | 77 | size++; |
| 65 | } | |
| 66 | } | |
| 67 | 21 | return size; |
| 68 | } | |
| 69 | ||
| 70 | /** | |
| 71 | * @return the index where this block starts in the next version; since blocks are most of the time not empty, the | |
| 72 | * returned value is the index of the first unmodified or added element in this group | |
| 73 | */ | |
| 74 | 21 | public int getNextStart() |
| 75 | { | |
| 76 | 21 | for (UnifiedDiffElement<E, F> element : this) { |
| 77 | 29 | if (!element.isDeleted()) { |
| 78 | 20 | return element.getIndex(); |
| 79 | } | |
| 80 | } | |
| 81 | 1 | return 0; |
| 82 | } | |
| 83 | ||
| 84 | /** | |
| 85 | * @return the size of this block (number of elements) in the next version; unmodified elements and elements marked | |
| 86 | * as added are counted only | |
| 87 | */ | |
| 88 | 21 | public int getNextSize() |
| 89 | { | |
| 90 | 21 | int size = 0; |
| 91 | 21 | for (UnifiedDiffElement<E, F> element : this) { |
| 92 | 104 | if (!element.isDeleted()) { |
| 93 | 79 | size++; |
| 94 | } | |
| 95 | } | |
| 96 | 21 | return size; |
| 97 | } | |
| 98 | ||
| 99 | 8 | @Override |
| 100 | public String toString() | |
| 101 | { | |
| 102 | 8 | StringBuilder stringBuilder = new StringBuilder(); |
| 103 | // The element index is 0-based so we add 1 for display. | |
| 104 | 8 | stringBuilder.append(String.format("@@ -%s,%s +%s,%s @@\n", getPreviousStart() + 1, getPreviousSize(), |
| 105 | getNextStart() + 1, getNextSize())); | |
| 106 | 8 | for (UnifiedDiffElement<E, F> element : this) { |
| 107 | 49 | stringBuilder.append(element); |
| 108 | } | |
| 109 | 8 | return stringBuilder.toString(); |
| 110 | } | |
| 111 | } |