| 1 | /* This file is part of the project "Hilbert II" - http://www.qedeq.org |
| 2 | * |
| 3 | * Copyright 2000-2014, Michael Meyling <mime@qedeq.org>. |
| 4 | * |
| 5 | * "Hilbert II" is free software; you can redistribute |
| 6 | * it and/or modify it under the terms of the GNU General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program 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 |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | package org.qedeq.kernel.se.dto.module; |
| 17 | |
| 18 | import java.util.ArrayList; |
| 19 | import java.util.List; |
| 20 | |
| 21 | import org.qedeq.base.utility.EqualsUtility; |
| 22 | import org.qedeq.kernel.se.base.module.LinkList; |
| 23 | |
| 24 | |
| 25 | /** |
| 26 | * List of links. A link is just a string that identifies something. |
| 27 | * |
| 28 | * @author Michael Meyling |
| 29 | */ |
| 30 | public class LinkListVo implements LinkList { |
| 31 | |
| 32 | /** Contains all list elements. */ |
| 33 | private final List list; |
| 34 | |
| 35 | /** |
| 36 | * Constructs an empty list of links. |
| 37 | */ |
| 38 | public LinkListVo() { |
| 39 | this.list = new ArrayList(); |
| 40 | |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * Add link to list. |
| 45 | * |
| 46 | * @param id Identifier to add. |
| 47 | */ |
| 48 | public final void add(final String id) { |
| 49 | list.add(id); |
| 50 | } |
| 51 | |
| 52 | public final int size() { |
| 53 | return list.size(); |
| 54 | } |
| 55 | |
| 56 | public final String get(final int index) { |
| 57 | return (String) list.get(index); |
| 58 | } |
| 59 | |
| 60 | public boolean equals(final Object obj) { |
| 61 | if (!(obj instanceof LinkListVo)) { |
| 62 | return false; |
| 63 | } |
| 64 | final LinkListVo otherList = (LinkListVo) obj; |
| 65 | if (size() != otherList.size()) { |
| 66 | return false; |
| 67 | } |
| 68 | for (int i = 0; i < size(); i++) { |
| 69 | if (!EqualsUtility.equals(get(i), otherList.get(i))) { |
| 70 | return false; |
| 71 | } |
| 72 | } |
| 73 | return true; |
| 74 | } |
| 75 | |
| 76 | public int hashCode() { |
| 77 | int hash = 0; |
| 78 | for (int i = 0; i < size(); i++) { |
| 79 | hash = hash ^ (i + 1); |
| 80 | if (get(i) != null) { |
| 81 | hash = hash ^ get(i).hashCode(); |
| 82 | } |
| 83 | } |
| 84 | return hash; |
| 85 | } |
| 86 | |
| 87 | public String toString() { |
| 88 | final StringBuffer buffer = new StringBuffer("List of links:\n"); |
| 89 | for (int i = 0; i < size(); i++) { |
| 90 | if (i != 0) { |
| 91 | buffer.append("\n"); |
| 92 | } |
| 93 | buffer.append((i + 1) + ":\n"); |
| 94 | buffer.append(get(i) != null ? get(i) : null); |
| 95 | } |
| 96 | return buffer.toString(); |
| 97 | } |
| 98 | |
| 99 | } |