defaultknowledgehelper.java

drools 一个开放源码的规则引擎

package org.drools.spi;

/*
 * $Id: DefaultKnowledgeHelper.java,v 1.2 2005/02/02 00:23:22 mproctor Exp $
 *
 * Copyright 2004 (C) The Werken Company. All Rights Reserved.
 *
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided that the
 * following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright statements and
 * notices. Redistributions must also contain a copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name "drools" must not be used to endorse or promote products derived
 * from this Software without prior written permission of The Werken Company.
 * For written permission, please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "drools" nor may
 * "drools" appear in their names without prior written permission of The Werken
 * Company. "drools" is a trademark of The Werken Company.
 *
 * 5. Due credit should be given to The Werken Company. (http://werken.com/)
 *
 * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE WERKEN COMPANY OR ITS CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
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 */

import java.util.List;

import org.drools.FactException;
import org.drools.FactHandle;
import org.drools.rule.Rule;

public class DefaultKnowledgeHelper implements KnowledgeHelper
{
    private final Rule  rule;
    private final Tuple tuple;

    public DefaultKnowledgeHelper( Rule rule,
                            Tuple tuple )
    {
        this.rule = rule;
        this.tuple = tuple;
    }

    public void assertObject(Object object) throws FactException
    {
        this.tuple.getWorkingMemory( ).assertObject( object );
    }

    public void assertObject(Object object,
                             boolean dynamic ) throws FactException
    {
        this.tuple.getWorkingMemory( ).assertObject( object,
                                                     dynamic );
    }

    public void modifyObject(Object object) throws FactException
    {
        FactHandle handle = this.tuple.getFactHandleForObject( object );

        this.tuple.getWorkingMemory( ).modifyObject( handle,
                                                     object );
    }

    public void modifyObject( Object oldObject,
                              Object newObject ) throws FactException
    {
        FactHandle handle = this.tuple.getFactHandleForObject( oldObject );

        this.tuple.getWorkingMemory( ).modifyObject( handle,
                                                     newObject );
    }

    public void retractObject( Object object ) throws FactException
    {
        FactHandle handle = this.tuple.getFactHandleForObject( object );

        this.tuple.getWorkingMemory( ).retractObject( handle );
    }

    public String getRuleName()
    {
        return this.rule.getName( );
    }

    public List getObjects()
    {
        return this.tuple.getWorkingMemory( ).getObjects( );
    }

    public List getObjects( Class objectClass )
    {
        return this.tuple.getWorkingMemory( ).getObjects( objectClass );
    }

    public void clearAgenda()
    {
        this.tuple.getWorkingMemory( ).clearAgenda( );
    }
}