externalcontrol/bundles/org.eclipse.papyrus.moka.externalcontrol/src/org/eclipse/papyrus/moka/externalcontrol/controller/LIFOPushPullStrategy.java

/*****************************************************************************
 * 
 * Copyright (c) 2017 CEA LIST.
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *  CEA LIST Initial API and implementation
 * 
 *****************************************************************************/
package org.eclipse.papyrus.moka.externalcontrol.controller;

import java.util.Iterator;
import java.util.Stack;

import org.eclipse.papyrus.moka.fuml.loci.ISemanticVisitor;

public class LIFOPushPullStrategy implements IControlledVisitorPushPullStrategy {

	private Stack<IExternallyControlledVisitor<? extends ISemanticVisitor>> visitors = new Stack<IExternallyControlledVisitor<? extends ISemanticVisitor>>();
	
	@Override
	public IExternallyControlledVisitor<? extends ISemanticVisitor> pullEnabledVisitor() {
		for (int i = 0; i< visitors.size(); i++){
			IExternallyControlledVisitor<? extends ISemanticVisitor> visitor = visitors.get(i);
			if (visitor.isExecutionAllowed()){
				visitors.remove(i);
				return visitor;
			}
		}
		return null;
	}


	@Override
	public void pushVisitor(IExternallyControlledVisitor<? extends ISemanticVisitor> visitor) {
			visitors.push(visitor);
	}
	
	

}