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.bo.logic.model; |
17 | |
18 | import org.qedeq.base.utility.EqualsUtility; |
19 | |
20 | /** |
21 | * Operators with arguments. |
22 | * |
23 | * @author Michael Meyling |
24 | */ |
25 | public abstract class Operator { |
26 | |
27 | /** Text to identify the variable. */ |
28 | private final String name; |
29 | |
30 | /** Argument number for variable. */ |
31 | private final int number; |
32 | |
33 | /** |
34 | * Constructor. |
35 | * |
36 | * @param name Text to identify the operator. |
37 | * @param number Argument number for operator. |
38 | */ |
39 | public Operator(final String name, final int number) { |
40 | this.name = name; |
41 | this.number = number; |
42 | } |
43 | |
44 | /** |
45 | * Get operator name. |
46 | * |
47 | * @return Operator name. |
48 | */ |
49 | public String getName() { |
50 | return name; |
51 | } |
52 | |
53 | /** |
54 | * Get number of arguments this operator has. |
55 | * |
56 | * @return Number of arguments for this operator. |
57 | */ |
58 | public int getArgumentNumber() { |
59 | return number; |
60 | } |
61 | |
62 | public int hashCode() { |
63 | return name.hashCode() ^ number ^ getClass().hashCode(); |
64 | } |
65 | |
66 | public boolean equals(final Object other) { |
67 | if (!(other instanceof Operator)) { |
68 | return false; |
69 | } |
70 | if (!other.getClass().equals(getClass())) { |
71 | return false; |
72 | } |
73 | final Operator var = (Operator) other; |
74 | return number == var.number && EqualsUtility.equals(name, var.name); |
75 | } |
76 | |
77 | public String toString() { |
78 | final StringBuffer buffer = new StringBuffer(); |
79 | buffer.append(name); |
80 | if (number > 0) { |
81 | buffer.append("("); |
82 | for (int i = 0; i < number; i++) { |
83 | if (i > 0) { |
84 | buffer.append(", "); |
85 | } |
86 | buffer.append("*"); |
87 | } |
88 | buffer.append(")"); |
89 | } |
90 | return buffer.toString(); |
91 | } |
92 | |
93 | } |