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 * One subject variable. This class is mainly used in the model area. 22 * For this kernel he normal form of a subject variable is an 23 * {@link org.qedeq.kernel.se.base.list.ElementList} 24 * with an {@link org.qedeq.kernel.se.base.list.Atom} with the name of the subject variable. 25 * 26 * @author Michael Meyling 27 */ 28 public class SubjectVariable { 29 30 /** Text to identify the subject variable. */ 31 private final String name; 32 33 /** 34 * Constructor. 35 * 36 * @param name Show this to represent the subject variable within outputs. 37 */ 38 public SubjectVariable(final String name) { 39 this.name = name; 40 } 41 42 /** 43 * Get subject variable name. 44 * 45 * @return Subject variable name. 46 */ 47 public String getName() { 48 return name; 49 } 50 51 public int hashCode() { 52 return name.hashCode(); 53 } 54 55 public boolean equals(final Object other) { 56 if (!(other instanceof SubjectVariable)) { 57 return false; 58 } 59 final SubjectVariable var = (SubjectVariable) other; 60 return EqualsUtility.equals(name, var.name); 61 } 62 63 public String toString() { 64 return name; 65 } 66 67 }