| 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.apache.commons.lang.ArrayUtils; |
| 19 | import org.qedeq.base.utility.EqualsUtility; |
| 20 | import org.qedeq.kernel.se.base.module.ModusPonens; |
| 21 | |
| 22 | |
| 23 | /** |
| 24 | * Modes Ponens usage. |
| 25 | * |
| 26 | * @author Michael Meyling |
| 27 | */ |
| 28 | public class ModusPonensVo implements ModusPonens { |
| 29 | |
| 30 | /** Usually reference to a formula like A -> B. */ |
| 31 | private String reference1; |
| 32 | |
| 33 | /** Usually reference to a formula like A. */ |
| 34 | private String reference2; |
| 35 | |
| 36 | /** |
| 37 | * Constructs a Modus Ponens argument. |
| 38 | * |
| 39 | * @param reference1 Usually reference to a formula like A -> B. Might be <code>null</code>. |
| 40 | * @param reference2 Usually reference to a formula like A. Might be <code>null</code>. |
| 41 | */ |
| 42 | public ModusPonensVo(final String reference1, final String reference2) { |
| 43 | this.reference1 = reference1; |
| 44 | this.reference2 = reference2; |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * Default constructor. |
| 49 | */ |
| 50 | public ModusPonensVo() { |
| 51 | // nothing to do |
| 52 | } |
| 53 | |
| 54 | public ModusPonens getModusPonens() { |
| 55 | return this; |
| 56 | } |
| 57 | |
| 58 | public String getReference1() { |
| 59 | return reference1; |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Set first formula reference. |
| 64 | * |
| 65 | * @param reference1 Reference to formula. Might be <code>null</code>. |
| 66 | */ |
| 67 | public void setReference1(final String reference1) { |
| 68 | this.reference1 = reference1; |
| 69 | } |
| 70 | |
| 71 | public String getReference2() { |
| 72 | return reference2; |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Set second formula reference. |
| 77 | * |
| 78 | * @param reference2 Reference to formula. Might be <code>null</code>. |
| 79 | */ |
| 80 | public void setReference2(final String reference2) { |
| 81 | this.reference2 = reference2; |
| 82 | } |
| 83 | |
| 84 | public String[] getReferences() { |
| 85 | if (reference1 == null) { |
| 86 | if (reference2 == null) { |
| 87 | return ArrayUtils.EMPTY_STRING_ARRAY; |
| 88 | } |
| 89 | return new String[] {reference2 }; |
| 90 | } |
| 91 | if (reference2 == null) { |
| 92 | return new String[] {reference1 }; |
| 93 | } |
| 94 | return new String[] {reference1, reference2 }; |
| 95 | } |
| 96 | |
| 97 | public boolean equals(final Object obj) { |
| 98 | if (!(obj instanceof ModusPonens)) { |
| 99 | return false; |
| 100 | } |
| 101 | final ModusPonens other = (ModusPonens) obj; |
| 102 | return EqualsUtility.equals(getReference1(), other.getReference1()) |
| 103 | && EqualsUtility.equals(getReference2(), other.getReference2()); |
| 104 | } |
| 105 | |
| 106 | public int hashCode() { |
| 107 | return (getReference1() != null ? getReference1().hashCode() : 0) |
| 108 | + (getReference2() != null ? 1 ^ getReference2().hashCode() : 0); |
| 109 | } |
| 110 | |
| 111 | public String toString() { |
| 112 | StringBuffer result = new StringBuffer(); |
| 113 | result.append(getName()); |
| 114 | if (getReference1() != null || getReference2() != null) { |
| 115 | result.append(" ("); |
| 116 | if (getReference1() != null) { |
| 117 | result.append(getReference1()); |
| 118 | } |
| 119 | if (getReference2() != null) { |
| 120 | if (getReference1() != null) { |
| 121 | result.append(", "); |
| 122 | } |
| 123 | result.append(getReference2()); |
| 124 | } |
| 125 | result.append(")"); |
| 126 | } |
| 127 | return result.toString(); |
| 128 | } |
| 129 | |
| 130 | public String getName() { |
| 131 | return "MP"; |
| 132 | } |
| 133 | |
| 134 | } |