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.bo.logic.common;
17
18 import org.qedeq.base.utility.EqualsUtility;
19
20 /**
21 * Predicate constant key, describing a predicate constant.
22 *
23 * @author Michael Meyling
24 */
25 public final class PredicateKey {
26
27 /** Predicate name. */
28 private String name;
29
30 /** Predicate argument number. */
31 private String arguments;
32
33 /**
34 * Constructor.
35 *
36 * @param name Predicate name.
37 * @param arguments Predicate argument number.
38 */
39 public PredicateKey(final String name, final String arguments) {
40 this.name = name;
41 this.arguments = arguments;
42 }
43
44 /**
45 * Get predicate name.
46 *
47 * @return Predicate name.
48 */
49 public String getName() {
50 return name;
51 }
52
53 /**
54 * Get predicate argument number.
55 *
56 * @return Number of arguments.
57 */
58 public String getArguments() {
59 return arguments;
60 }
61
62 public int hashCode() {
63 return (getName() != null ? getName().hashCode() : 0)
64 ^ (getArguments() != null ? getArguments().hashCode() : 0);
65 }
66
67 public boolean equals(final Object obj) {
68 if (!(obj instanceof PredicateKey)) {
69 return false;
70 }
71 final PredicateKey other = (PredicateKey) obj;
72 return EqualsUtility.equals(getName(), other.getName())
73 && EqualsUtility.equals(getArguments(), other.getArguments());
74 }
75
76 public String toString() {
77 return getName() + "[" + getArguments() + "]";
78 }
79
80 }