1 /* This file is part of the project "Hilbert II" - http://www.qedeq.org" target="alexandria_uri">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 org.qedeq.base.utility.EqualsUtility;
19 import org.qedeq.kernel.se.base.list.Element;
20 import org.qedeq.kernel.se.base.module.Formula;
21
22
23 /**
24 * Wraps a formula. Such an object is build out of
25 * {@link org.qedeq.kernel.se.base.list.Element}s.
26 *
27 * @author Michael Meyling
28 */
29 public class FormulaVo implements Formula {
30
31 /** Formula. */
32 private Element element;
33
34 /**
35 * Constructs a formula.
36 *
37 * @param element Element that should be a formula.
38 */
39 public FormulaVo(final Element element) {
40 this.element = element;
41 }
42
43 /**
44 * Empty constructor.
45 */
46 public FormulaVo() {
47 // nothing to do
48 }
49
50 /**
51 * Set formula.
52 *
53 * @param element Formula.
54 */
55 public final void setElement(final Element element) {
56 this.element = element;
57 }
58
59 public final Element getElement() {
60 return element;
61 }
62
63 public boolean equals(final Object obj) {
64 if (!(obj instanceof FormulaVo)) {
65 return false;
66 }
67 final FormulaVo other = (FormulaVo) obj;
68 return EqualsUtility.equals(getElement(), other.getElement());
69 }
70
71 public int hashCode() {
72 return (getElement() != null ? getElement().hashCode() : 0);
73 }
74
75 public String toString() {
76 if (getElement() != null) {
77 return getElement().toString();
78 }
79 return "";
80 }
81
82 }