| 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.Add; |
| 21 | |
| 22 | |
| 23 | /** |
| 24 | * Usage of formula addition. |
| 25 | * |
| 26 | * @author Michael Meyling |
| 27 | */ |
| 28 | public class AddVo implements Add { |
| 29 | |
| 30 | /** Reference to previously proven formula. */ |
| 31 | private String reference; |
| 32 | |
| 33 | /** |
| 34 | * Constructs an addition argument. |
| 35 | * |
| 36 | * @param reference Reference to a valid formula. |
| 37 | */ |
| 38 | public AddVo(final String reference) { |
| 39 | this.reference = reference; |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * Default constructor. |
| 44 | */ |
| 45 | public AddVo() { |
| 46 | // nothing to do |
| 47 | } |
| 48 | |
| 49 | public Add getAdd() { |
| 50 | return this; |
| 51 | } |
| 52 | |
| 53 | public String getReference() { |
| 54 | return reference; |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Set formula reference. |
| 59 | * |
| 60 | * @param reference Reference to formula. Might be <code>null</code>. |
| 61 | */ |
| 62 | public void setReference(final String reference) { |
| 63 | this.reference = reference; |
| 64 | } |
| 65 | |
| 66 | public String[] getReferences() { |
| 67 | if (reference == null) { |
| 68 | return ArrayUtils.EMPTY_STRING_ARRAY; |
| 69 | } |
| 70 | return new String[] {reference }; |
| 71 | } |
| 72 | |
| 73 | public boolean equals(final Object obj) { |
| 74 | if (!(obj instanceof AddVo)) { |
| 75 | return false; |
| 76 | } |
| 77 | final AddVo other = (AddVo) obj; |
| 78 | return EqualsUtility.equals(reference, other.reference); |
| 79 | } |
| 80 | |
| 81 | public int hashCode() { |
| 82 | return (reference != null ? reference.hashCode() : 0); |
| 83 | } |
| 84 | |
| 85 | public String toString() { |
| 86 | StringBuffer result = new StringBuffer(); |
| 87 | result.append("Add"); |
| 88 | if (reference != null) { |
| 89 | result.append(" ("); |
| 90 | result.append(reference); |
| 91 | result.append(")"); |
| 92 | } |
| 93 | return result.toString(); |
| 94 | } |
| 95 | |
| 96 | public String getName() { |
| 97 | return "Add"; |
| 98 | } |
| 99 | |
| 100 | } |