plugins/design/org.eclipse.papyrus.pdp4eng.designer.engine/src/org/eclipse/papyrus/pdp4eng/designer/engine/api/StrategyEngineFactory.java

/**
 *  Copyright (c)2020 CEA LIST, Committer Name, and others.
 * 
 *  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
 *  Gabriel Pedroza (CEA LIST) gabriel.pedroza@cea.fr
 * 
 */
package org.eclipse.papyrus.pdp4eng.designer.engine.api;

import org.eclipse.papyrus.pdp4eng.designer.engine.api.internal.StrategyEngine;

/**
 * Req003.002: the engine shall be a singleton.
 *
 */
public class StrategyEngineFactory {

	 protected IStrategyEngine strategyEngine;
	
	private StrategyEngineFactory() {
		super();
	}
	
	private static StrategyEngineFactory instance=null;

	public static StrategyEngineFactory getInstance() {
		 if( instance==null) {
			 instance= new StrategyEngineFactory();
		 }
		 return instance;
	}
	/** 
	 * 
	 * @return get the current engine
	 */
	public IStrategyEngine getCurrentEngine() {
		if( strategyEngine==null) {
			createEngine();
		}
		return strategyEngine;
	}
	
	/**
	 * create a default engine
	 * if you want to instanciate an new engine, you can inherit and add your own method of engine creation :D
	 */
	public void createEngine() {
		strategyEngine= new StrategyEngine();
	}
}