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 org.qedeq.base.utility.EqualsUtility; |
19 | import org.qedeq.kernel.se.base.module.Formula; |
20 | import org.qedeq.kernel.se.base.module.Hypothesis; |
21 | |
22 | |
23 | /** |
24 | * Hypothesis that can be used as an assumption within a proof. |
25 | * |
26 | * @author Michael Meyling |
27 | */ |
28 | public class HypothesisVo implements Hypothesis { |
29 | |
30 | /** Label for back references. Might be <code>null</code>. */ |
31 | private String label; |
32 | |
33 | /** Derived formula. */ |
34 | private Formula formula; |
35 | |
36 | /** |
37 | * Constructs an proof line. |
38 | * |
39 | * @param formula New derived formula. |
40 | */ |
41 | public HypothesisVo(final Formula formula) { |
42 | this.label = null; |
43 | this.formula = formula; |
44 | } |
45 | |
46 | /** |
47 | * Constructs an proof line. |
48 | * |
49 | * @param label Label for back references. Might be <code>null</code>. |
50 | * @param formula New derived formula. |
51 | */ |
52 | public HypothesisVo(final String label, final Formula formula) { |
53 | this.label = label; |
54 | this.formula = formula; |
55 | } |
56 | |
57 | /** |
58 | * Default constructor. |
59 | */ |
60 | public HypothesisVo() { |
61 | // nothing to do |
62 | } |
63 | |
64 | public Formula getFormula() { |
65 | return formula; |
66 | } |
67 | |
68 | /** |
69 | * Set proof line formula. |
70 | * |
71 | * @param formula Set formula. |
72 | */ |
73 | public void setFormula(final Formula formula) { |
74 | this.formula = formula; |
75 | } |
76 | |
77 | public String getLabel() { |
78 | return label; |
79 | } |
80 | |
81 | /** |
82 | * Set label for proof line. |
83 | * |
84 | * @param label Set this label. |
85 | */ |
86 | public void setLabel(final String label) { |
87 | this.label = label; |
88 | } |
89 | |
90 | public boolean equals(final Object obj) { |
91 | if (!(obj instanceof HypothesisVo)) { |
92 | return false; |
93 | } |
94 | final HypothesisVo other = (HypothesisVo) obj; |
95 | return EqualsUtility.equals(label, other.label) |
96 | && EqualsUtility.equals(formula, other.formula); |
97 | } |
98 | |
99 | public int hashCode() { |
100 | return (label != null ? label.hashCode() : 0) |
101 | ^ (formula != null ? 1 ^ formula.hashCode() : 0); |
102 | } |
103 | |
104 | public String toString() { |
105 | return (label != null ? "[" + label + "] " : " ") + getFormula() + " " |
106 | + "Hypothesis"; |
107 | } |
108 | |
109 | } |