testinferenceengine5.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.InferenceEngine;
import org.mandarax.kernel.KnowledgeBase;
import org.mandarax.kernel.Query;

/**
 * Combination of sample 1 and 2. The basic structure is taken from 1,
 * but we use functions like in 2.
 * @see test.org.mandarax.reference.TestInferenceEngine1
 * @see test.org.mandarax.reference.TestInferenceEngine2
 * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
 * @version 3.4 <7 March 05>
 * @since 1.1
 */
public class TestInferenceEngine5 extends TestInferenceEngine {

    /**
     * Constructor.
     * @param aKnowledgeBase a new, uninitialized knowledge base that will be used
     * @param anInferenceEngine the inference engine that will be tested
     */
    public TestInferenceEngine5(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 ();

        // the actual inference rules
        knowledge.add (Person.getRule ("isGrandFatherOf", "x", "z",
                                       "isFatherOf", "y", "z", "isFatherOf",
                                       "x", "y"));
        knowledge.add (Person.getRule ("isOncleOf", "x", "z", "isFatherOf",
                                       "y", "z", "isBrotherOf", "x", "y"));
        knowledge.add (Person.getRule ("isOncleOf", "x", "z",
                                       "isGrandFatherOf", "y", "z",
                                       "isBrotherOf", "x", "y"));
        knowledge.add (Person.getRule ("isGrandFatherOf", "z", "x",
                                       "isFatherOf", "y", "x", "isFatherOf",
                                       "z", "y"));

        // rules defining predicates
        knowledge.add (Person.getRule ("isFatherOf", "x", "y", "equals", "x",
                                       "father(y)"));
        knowledge.add (Person.getRule ("isBrotherOf", "x", "y", "equals",
                                       "z", "father(y)", "equals", "z",
                                       "father(x)", "equalsNot", "x", "y"));

        // facts
        knowledge.add (Person.getFact ("equals", "Klaus", "father(Jens)"));
        knowledge.add (Person.getFact ("equals", "Otto", "father(Klaus)"));
        knowledge.add (Person.getFact ("equals", "Otto", "father(Lutz)"));
        knowledge.add (Person.getFact ("equals", "Jens", "father(Max)"));

        // facts just loop and add for all possible combinations either an equal or equals not fact
        String[] names1 = { "Max", "Jens", "Klaus", "Otto", "Lutz" };
        String[] names2 = { "Max", "Jens", "Klaus", "Otto", "Lutz" };
        Person   p1,
                 p2     = null;

        for(int i = 0; i < names1.length; i++) {
            p1 = Person.get (names1[i]);

            for(int j = 0; j < i; j++) {
                p2 = Person.get (names2[j]);

                if(p1.equalsNot (p2)) {
                    knowledge.add (Person.getFact ("equalsNot", names1[i],
                                                   names2[j]));
                }
            }
        }

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

    /**
     * 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 "Combination of sample 1 and 2.\nThe basic structure is taken from 1,\nbut we use functions like in 2.";
    }

    /**
     * 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 ("isOncleOf", QUERY_VARIABLE, "Max");
    }
}