testknowledgebaseevents1.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.Clause;
import org.mandarax.kernel.KnowledgeBaseChangeEvent;

/**
 * Test whether the appropriate events are fired when adding / removing clauses.
 * @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 TestKnowledgeBaseEvents1 extends TestKnowledgeBase {

    /**
     * Constructor.
     * @param aKnowledgeBase a knowledge base
     */
    public TestKnowledgeBaseEvents1(
            org.mandarax.kernel.KnowledgeBase aKnowledgeBase) {
        super (aKnowledgeBase);
    }

    /**
     * Run the test.
     */
    public void testKnowledgeBase() {
        kb.removeAll ();

        Clause c1 = Person.getFact ("isFatherOf", "Jens", "Max");
        Clause c2 = Person.getRule ("isGrandFatherOf", "x", "z",
                                    "isFatherOf", "y", "z", "isFatherOf",
                                    "x", "y");

        // register listener
        EventHandler handler = new EventHandler ();

        kb.addKnowledgeBaseChangeListener (handler);

        // manipulate knowledge
        kb.add (c1);
        kb.add (c2);
        kb.remove (c1);
        kb.removeKnowledgeBaseChangeListener (handler);
        kb.remove (c2);

        // now check the stack of events handled by the listener
        int                      eventsSize = handler.handledEvents.size ();
        KnowledgeBaseChangeEvent e1         =
            (KnowledgeBaseChangeEvent) handler.handledEvents.get (eventsSize
                - 1);
        KnowledgeBaseChangeEvent e2 =
            (KnowledgeBaseChangeEvent) handler.handledEvents.get (eventsSize
                - 2);
        KnowledgeBaseChangeEvent e3 =
            (KnowledgeBaseChangeEvent) handler.handledEvents.get (eventsSize
                - 3);

        // check events
        boolean result = true;

        result = result && (e1.getType () == KnowledgeBaseChangeEvent.CLAUSE_REMOVED)
                 && (e1.getSource () == kb)
                 && (e1.getAffectedClauses ().size () == 1)
                 && e1.getAffectedClauses ().contains (c1);
        result = result && (e2.getType () == KnowledgeBaseChangeEvent.CLAUSE_ADDED)
                 && (e2.getSource () == kb)
                 && (e2.getAffectedClauses ().size () == 1)
                 && e2.getAffectedClauses ().contains (c2);
        result = result && (e3.getType () == KnowledgeBaseChangeEvent.CLAUSE_ADDED)
                 && (e3.getSource () == kb)
                 && (e3.getAffectedClauses ().size () == 1)
                 && e3.getAffectedClauses ().contains (c1);

        assertTrue (result);
    }
}