rule.java

著名的开源仿真软件yale

/*
 *  YALE - Yet Another Learning Environment
 *  Copyright (C) 2002, 2003
 *      Simon Fischer, Ralf Klinkenberg, Ingo Mierswa, 
 *          Katharina Morik, Oliver Ritthoff
 *      Artificial Intelligence Unit
 *      Computer Science Department
 *      University of Dortmund
 *      44221 Dortmund,  Germany
 *  email: [e-mail]
 *  web:   http://yale.cs.uni-dortmund.de/
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License as 
 *  published by the Free Software Foundation; either version 2 of the
 *  License, or (at your option) any later version. 
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA.
 */
package edu.udo.cs.yale.operator.learner.decisiontree;

import edu.udo.cs.yale.example.Example;
import edu.udo.cs.yale.example.ExampleSet;
import edu.udo.cs.yale.tools.Ontology;
import edu.udo.cs.yale.tools.LogService;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.ListIterator;

/** A rule with premises and one conclusion. The conclusion or goal can be a classification or another
 *  rule (then the rule is rather a tree).
 *
 *  @author Ingo
 *  @version $Id: Rule.java,v 2.1 2003/04/04 11:59:29 fischer Exp $
 */
public class Rule implements Serializable {

    private Tree goal;
    private Premise premise;

    /** Creates a new Rule with the given premises and conclusion.
     */
    public Rule(Tree goal, Premise premise) {
	this.goal = goal;
	this.premise = premise;
    }

    Tree getGoal() { 
	return goal; 
    }

    Premise getPremise() {
	return premise;
    }

    /** Returns true if all premises are fulfilled.
     */
    boolean isTrue(Example example) {
	if (premise == null) return true;
	return premise.isTrue(example);
    }

    public String toString() {
	return toString("");
    }

    public String toString(String prefix) {
	return prefix + premise.toString() + " --> " + goal.toString(prefix + "   ");
    }
}