001    /**
002     * Copyright (C) 2007-2011, Jens Lehmann
003     *
004     * This file is part of DL-Learner.
005     *
006     * DL-Learner is free software; you can redistribute it and/or modify
007     * it under the terms of the GNU General Public License as published by
008     * the Free Software Foundation; either version 3 of the License, or
009     * (at your option) any later version.
010     *
011     * DL-Learner is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014     * GNU General Public License for more details.
015     *
016     * You should have received a copy of the GNU General Public License
017     * along with this program.  If not, see <http://www.gnu.org/licenses/>.
018     */
019    
020    package org.dllearner.prolog;
021    
022    /**
023     * 
024     * @author Sebastian Bader
025     * 
026     */
027    public class Variable extends Term {
028            private String name;
029    
030            public Variable(String name) {
031                    this.name = name;
032            }
033    
034            public String getName() {
035                    return name;
036            }
037    
038            public void setName(String name) {
039                    this.name = name;
040            }
041    
042            @Override
043            public boolean isGround() {
044                    return false;
045            }
046    
047            @Override
048            public String toString() {
049                    return "V[" + name + "]";
050            }
051    
052            @Override
053            public String toPLString() {
054                    return name;
055            }
056    
057            @Override
058            public Term getInstance(Variable variable, Term term) {
059                    if (this.equals(variable)) {
060                            return term;
061                    }
062                    return this;
063            }
064    
065            @Override
066            public boolean equals(Object obj) {
067                    if (obj == null)
068                            return false;
069    
070                    Variable v;
071                    try {
072                            v = (Variable) obj;
073                    } catch (ClassCastException cce) {
074                            return false;
075                    }
076    
077                    return name.equals(v.name);
078            }
079    
080            @Override
081            public int hashCode() {
082                    return name.hashCode();
083            }
084    
085            @Override
086            public Object clone() {
087                    return new Variable(name);
088            }
089    }