comparatortest2.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 test.org.mandarax.comparators;

import java.util.Comparator;

import org.mandarax.kernel.ClauseSet;
import org.mandarax.util.comparators.DefaultClauseSetComparator;
import org.mandarax.util.comparators.PreferFactsWithLessVariables;
import org.mandarax.util.comparators.PreferRulesWithLessNegatedPrerequisites;
import org.mandarax.util.comparators.PreferRulesWithLessVariablesInPrerequisites;
import org.mandarax.util.comparators.PreferRulesWithMorePrerequisites;

/**
 * Comparator test, see #getComparator for definition of clause order.
 * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
 * @version 3.4 <7 March 05>
 * @since 2.2
 */
public class ComparatorTest2 extends ComparatorTest{
	
    /**
     * Constructor.
     */
    public ComparatorTest2() {
        super ();
    }
	/**
	 * Get the expected order.
	 * @return an array of clause sets
	 */
	protected ClauseSet[] getExpectedOrder() {
	    // F0 - fact with 0 variables
	    // F1 - fact with 1 variable
	    // F2 - fact with 2 variables
		// R0 - 1 prerequisite, 4 variables (occurrences), no negated prerequisite
		// R1 - 2 prerequisites, 6 variables (occurrences), no negated prerequisite
		// R2 - 2 prerequisites, 6 variables (occurrences), 1 prerequisite is negated
		return new ClauseSet[] {F0,F1,F2,R1,R2,R0};
	}
	/**
	 * Get the input order.
	 * @return an array of clause sets
	 */
	protected ClauseSet[] getInputOrder() {
		return new ClauseSet[] {F0,R0,F1,R1,F2,R2};
	}
	
	/**
	 * Get the comparator.
	 * @return a comparator
	 */
	protected Comparator getComparator() {
		DefaultClauseSetComparator comp = new DefaultClauseSetComparator();
		comp.setTopLevelOrder(new String[]{comp.FACTS,comp.SQL_CLAUSE_SETS,comp.OTHERS,comp.RULES});
		comp.setComparators4Facts(new Comparator[]{new PreferFactsWithLessVariables()});
		comp.setComparators4Rules(new Comparator[]{
			new PreferRulesWithMorePrerequisites(),
			new PreferRulesWithLessVariablesInPrerequisites(),
			new PreferRulesWithLessNegatedPrerequisites()
		});
			
		return comp;
	}		
    
}