| 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 | } |