testinferenceengine9.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.reference;


import org.mandarax.kernel.Fact;
import org.mandarax.kernel.InferenceEngine;
import org.mandarax.kernel.KnowledgeBase;
import org.mandarax.kernel.Query;
import org.mandarax.kernel.Rule;

/**
 * Very simple test to show how to derive from rules having their prerequisites connected by OR.
 * @see org.mandarax.reference.ResolutionInferenceEngine
 * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
 * @version 3.4 <7 March 05>
 * @since 1.3
 */
public class TestInferenceEngine9 extends TestInferenceEngine {

    /**
     * Constructor.
     * @param aKnowledgeBase a new, uninitialized knowledge base that will be used
     * @param anInferenceEngine the inference engine that will be tested
     */
    public TestInferenceEngine9(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 ();

        Fact prereq1 = Person.getFact ("isBrotherOf", "x", "y");
        Fact prereq2 = Person.getFact ("isFatherOf", "x", "y");
        Fact concl   = Person.getFact ("isRelativeOf", "x", "y");
        Rule rule    =
            (new org.mandarax.util.LogicFactorySupport ()).orRule (prereq1,
                prereq2, concl);

        knowledge.add (rule);
        knowledge.add (Person.getFact ("isBrotherOf", "Klaus", "Lutz"));
    }

    /**
     * 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 "Simple derivation using a rule that has prerequisites connected by OR";
    }

    /**
     * Get the name of the person we are looking for.
     * More precisely, this is the name of the person expected to
     * replace the query variable as a result of the query.
     * @return the name of the person
     */
    String getPersonName() {
        return "Lutz";
    }

    /**
     * Get the query.
     * @return a query
     */
    public Query getQuery() {
        return Person.getQuery ("isRelativeOf", "Klaus", QUERY_VARIABLE);
    }
}