testinferenceengine16.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

package test.org.mandarax.reference;

/*
 * 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
 */



import org.mandarax.kernel.ComplexTerm;
import org.mandarax.kernel.ConstantTerm;
import org.mandarax.kernel.InferenceEngine;
import org.mandarax.kernel.InferenceException;
import org.mandarax.kernel.KnowledgeBase;
import org.mandarax.kernel.Query;
import org.mandarax.kernel.ResultSet;
import org.mandarax.kernel.Term;
import org.mandarax.kernel.VariableTerm;
import org.mandarax.lib.math.IntArithmetic;

/**
 * Tests queries returning results still containing variables (in complex terms). 
 * Hint : read the clauses in the test kb as P1 as 'is number' and P2 as 'is even number'.
 * We then query for even numbers and must get: any 2*x as result.
 * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
 * @version 3.4 <7 March 05>
 * @since 1.9.2
 */
public class TestInferenceEngine16 extends TestInferenceEngineUseMath {
	
      
    /**
     * Constructor.
     * @param aKnowledgeBase a new, uninitialized knowledge base that will be used
     * @param anInferenceEngine the inference engine that will be tested
     */
    public TestInferenceEngine16(KnowledgeBase aKnowledgeBase,InferenceEngine anInferenceEngine) {
        super (aKnowledgeBase, anInferenceEngine);
    }

    /**
     * Add facts and rules to the knowledge base.
     * @param knowledge org.mandarax.kernel.KnowledgeBase
     */
    public void feedKnowledgeBase(KnowledgeBase knowledge) {
        knowledge.removeAll ();
        
        // hint : read P1 as 'is number' and P2 as 'is even number'
        knowledge.add(
        	lfs.fact(P1,"x")
        );
        knowledge.add(
        	lfs.rule(
	        	lfs.fact(P1,"x"),
				lfs.fact(P2,lfs.cplx(IntArithmetic.TIMES,new Integer(2),"x"))  
			) 
        );
    }
    
    /**
     * Get the expected number.
     * @return the name of the person
     */
    int getExpectedNumber() {
    	return 42;
    }    

    /**
     * Get a description of this test case.
     * This is used by the <code>org.mandarax.demo</code>
     * package to display the test cases.
     * @return a brief description of the test case
     */
    public String getDescription() {
        return "Testing complex terms in result sets";
    }

    /**
     * Get the query.
     * @return a query
     */
    public Query getQuery() {
        return lfs.query(lfs.fact(P2,QUERY_VARIABLE),"a query");
    }
    
    /**
     * Run the test.
     */
    public void testInferenceEngine() {
        LOG_TEST.info ("Start Testcase " + getClass ().getName () + " , test method: " + "testInferenceEngine()");
		try {
        	ResultSet rs    = ie.query (getQuery(),kb,getCardinalityConstraint(),InferenceEngine.BUBBLE_EXCEPTIONS);
        	boolean result = rs.next();
        	ComplexTerm t = (ComplexTerm)rs.getResult(Integer.class,QUERY_VARIABLE);
        	result = result && t.getFunction().equals(IntArithmetic.TIMES);
        	Term[] terms = t.getTerms();
        	result = result && (terms[0] instanceof ConstantTerm) && (((ConstantTerm)terms[0]).getObject().equals(new Integer(2))); 
        	result = result && (terms[1] instanceof VariableTerm) && (terms[1].getType() == Integer.class);
        	assertTrue(result);
		}
		catch (InferenceException x) {
			assertTrue(false);
		}
        LOG_TEST.info ("Finish Testcase " + getClass ().getName () + " , test method: " + "testInferenceEngine()");
    }


}