01 /* This file is part of the project "Hilbert II" - http://www.qedeq.org
02 *
03 * Copyright 2000-2013, 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.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 }
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