testinferenceengine7.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.ClauseSet;
import org.mandarax.kernel.InferenceEngine;
import org.mandarax.kernel.KnowledgeBase;
import org.mandarax.kernel.Query;

/**
 * Same as FamilySample6, but use a JClauseSet to build the notEquals dynamically
 * Note that this example does not run correctly in an applet environment using
 * the default security settings since the dynamic invokation of a java method
 * leads to a security exception. Since this exception is captured the program continues
 * but the knowledge base does not contain all facts required
 * Run this sample in an application environment!
 * @see test.org.mandarax.reference.TestInferenceEngine6
 * @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 TestInferenceEngine7 extends TestInferenceEngine {

    /**
     * Constructor.
     * @param aKnowledgeBase a new, uninitialized knowledge base that will be used
     * @param anInferenceEngine the inference engine that will be tested
     */
    public TestInferenceEngine7(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
        java.util.Vector names = new java.util.Vector ();

        names.addElement (Person.get ("Max"));
        names.addElement (Person.get ("Jens"));
        names.addElement (Person.get ("Klaus"));
        names.addElement (Person.get ("Otto"));
        names.addElement (Person.get ("Lutz"));

        try {
            ClauseSet cs = new org.mandarax.kernel.meta.EqualsClauseSet (names, true);
            knowledge.add (cs);
        } catch(Throwable t) {
            System.err.println (t.getMessage ());
        }

        // 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() {
        StringBuffer buf = new StringBuffer ();

        buf.append (
            "Same as FamilySample6, but use a JClauseSet to build the notEquals dynamically\n");
        buf.append (
            "Note that this example does not run correctly in an applet environment using\n");
        buf.append (
            "the default security settings since the dynamic invokation of a java method\n");
        buf.append (
            "leads to a security exception. Since this exception is captured the program continues\n");
        buf.append (
            "but the knowledge base does not contain all facts required\n");
        buf.append ("Run this sample in an application environment!\n");

        return new String (buf);
    }

    /**
     * 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");
    }
}