leapsfacthandle.java

jboss规则引擎

package org.drools.leaps;

/*
 * Copyright 2005 JBoss Inc
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import org.drools.common.DefaultFactHandle;

/**
 * class container for each object asserted / retracted into the system
 * 
 * @author Alexander Bagerman
 * 
 */
public class LeapsFactHandle extends DefaultFactHandle {

    private List activatedTuples = null;

    private List notTuples       = null;

    private List existsTuples    = null;

    public LeapsFactHandle(final long id, final Object object) {
        super( id, object );
    }

    protected void addActivatedTuple( final LeapsTuple tuple ) {
        if (this.activatedTuples == null) {
            this.activatedTuples = new LinkedList( );
        }
        this.activatedTuples.add( tuple );
    }

    protected void addNotTuple( final LeapsTuple tuple, final int index ) {
        if (this.notTuples == null) {
            this.notTuples = new LinkedList( );
        }
        this.notTuples.add( new FactHandleTupleAssembly( tuple, index ) );
    }

    protected void addExistsTuple( final LeapsTuple tuple, final int index ) {
        if (this.existsTuples == null) {
            this.existsTuples = new LinkedList( );
        }
        this.existsTuples.add( new FactHandleTupleAssembly( tuple, index ) );
    }

    protected Iterator getActivatedTuples() {
        if (this.activatedTuples != null) {
            return this.activatedTuples.iterator( );
        }
        return null;
    }

    protected Iterator getNotTupleAssemblies() {
        if (this.notTuples != null) {
            return this.notTuples.iterator( );
        }
        return null;
    }

    protected Iterator getExistsTupleAssemblies() {
        if (this.existsTuples != null) {
            return this.existsTuples.iterator( );
        }
        return null;
    }
}