derivation.java

Mandarax是一个规则引擎的纯Java实现。它支持多类型的事实和基于反映的规则

/*
 * Copyright (C) 1999-2004 <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</a>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.mandarax.kernel;


/**
 * Represents a logical derivation.
 * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
 * @version 3.4 <7 March 05>
 * @since 1.0
 */
public class Derivation extends LObject {

    private DerivationNode root;
	private int resultNumber = -1;
    /**
     * Constructor. Pass the root.
     * @param r the root node of the derivation
     * @param resultNumber the result number (in a result set)
     */
    public Derivation(DerivationNode r, int resultNumber) {
        super ();
        root = r;
        this.resultNumber = resultNumber;
    }

    /**
     * Get the root of a derivation.
     * @return the root node of this derivation
     */
    public DerivationNode getRoot() {
        return root;
    }
    /**
     * Get the number of the result in the result set this derivation represents.
     * @return the result number
     */ 
    public int getResultNumber(){
    	return resultNumber;
    }

}