org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete/src/org/eclipse/viatra2/gtasm/patternmatcher/incremental/rete/misc/Bag.java

/*******************************************************************************
 * Copyright (c) 2004-2008 Gabor Bergmann and Daniel Varro
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Gabor Bergmann - initial API and implementation
 *******************************************************************************/

package org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete.misc;

import java.util.Collection;
import java.util.LinkedList;

import org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete.network.Direction;
import org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete.network.ReteContainer;
import org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete.single.SingleInputNode;
import org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete.tuple.Tuple;


/**
 * @author Gabor Bergmann
 * 
 *         A bag is a container that tuples can be dumped into. Does NOT
 *         propagate updates! Optimized for small contents size OR positive
 *         updates only.
 */
public class Bag extends SingleInputNode {

	public Collection<Tuple> contents;

	public Bag(ReteContainer reteContainer) {
		super(reteContainer);
		contents = new LinkedList<Tuple>();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete.network.Receiver#update(org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete.network.Direction, org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete.tuple.Tuple)
	 */
	public void update(Direction direction, Tuple updateElement) {
		if (direction == Direction.INSERT)
			contents.add(updateElement);
		else
			contents.remove(updateElement);
	}

	public void pullInto(Collection<Tuple> collector) {
		// IGNORE
		throw new UnsupportedOperationException("Bag contents cannot be pulled");
	}

}