01 /* This file is part of the project "Hilbert II" - http://www.qedeq.org
02 *
03 * Copyright 2000-2011, Michael Meyling <mime@qedeq.org>.
04 *
05 * "Hilbert II" is free software; you can redistribute
06 * it and/or modify it under the terms of the GNU General Public
07 * License as published by the Free Software Foundation; either
08 * version 2 of the License, or (at your option) any later version.
09 *
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.Add;
20
21
22 /**
23 * Usage of formula addition.
24 *
25 * @author Michael Meyling
26 */
27 public class AddVo implements Add {
28
29 /** Reference to previously proven formula. */
30 private String reference;
31
32 /**
33 * Constructs an addition argument.
34 *
35 * @param reference Reference to a valid formula.
36 */
37 public AddVo(final String reference) {
38 this.reference = reference;
39 }
40
41 /**
42 * Default constructor.
43 */
44 public AddVo() {
45 // nothing to do
46 }
47
48 public String getReference() {
49 return reference;
50 }
51
52 /**
53 * Set formula reference.
54 *
55 * @param reference Reference to formula.
56 */
57 public void setReference(final String reference) {
58 this.reference = reference;
59 }
60
61 public String[] getReferences() {
62 if (reference == null || reference.length() == 0) {
63 return new String[] {};
64 } else {
65 return new String[] {reference };
66 }
67 }
68
69 public boolean equals(final Object obj) {
70 if (!(obj instanceof AddVo)) {
71 return false;
72 }
73 final AddVo other = (AddVo) obj;
74 return EqualsUtility.equals(reference, other.reference);
75 }
76
77 public int hashCode() {
78 return (reference != null ? reference.hashCode() : 0);
79 }
80
81 public String toString() {
82 StringBuffer result = new StringBuffer();
83 result.append("Add");
84 if (reference != null) {
85 result.append(" (");
86 if (reference != null) {
87 result.append(reference);
88 }
89 result.append(")");
90 }
91 return result.toString();
92 }
93
94 public String getName() {
95 return "Add";
96 }
97
98 }
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