org.eclipse.fmc.blockdiagram.editor/src/org/eclipse/fmc/blockdiagram/editor/algorithm/comment/CommentAlgorithmFactory.java

/*******************************************************************************
 * <copyright>
 *
 * Copyright (c) 2013, 2013 SAP AG.
 * 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:
 *    SAP AG - initial API, implementation and documentation
 *
 * </copyright>
 *
 *******************************************************************************/
package org.eclipse.fmc.blockdiagram.editor.algorithm.comment;

import org.eclipse.fmc.blockdiagram.editor.model.FMCTypeChecker;
import org.eclipse.fmc.blockdiagram.editor.model.FMCTypeCheckerFactory;
import org.eclipse.graphiti.mm.pictograms.PictogramElement;

/**
 * This factory produces Comment algorithms depending on an already existing
 * comment instance. The factory is responsible for creating the appropriate
 * algorithm. This class is singleton.
 * 
 * @author Heiko Witteborg
 * 
 */
public class CommentAlgorithmFactory {

	private static CommentAlgorithmFactory instance;
	private FMCTypeChecker helper = FMCTypeCheckerFactory.getInstance();

	private BraceAlgorithm brace = null;

	private CommentAlgorithmFactory() {
	}

	/**
	 * Lazy initialization method of this factory.
	 * 
	 * @return The singleton instance of this factory.
	 */
	public static synchronized CommentAlgorithmFactory getInstance() {
		if (instance == null) {
			instance = new CommentAlgorithmFactory();
		}
		return instance;
	}

	/**
	 * Returns the brace algorithm singleton instance.
	 * @return BraceAlgorithm object.
	 */
	public BraceAlgorithm getBrace() {
		if (brace == null) {
			brace = new BraceAlgorithm();
		}
		return brace;
	}

	/**
	 * Returns the appropriate algorithm for the already existing pictogram
	 * element.
	 * 
	 * @param picto
	 *            The pictogram element to find the algorithm for.
	 * @return The appropriate FMCNodeAlgorithm instance.
	 * 
	 */
	public CommentAlgorithm getShape(PictogramElement picto) {
		if (helper.isBrace(picto)) {
			return getBrace();
		}
		return null;
	}
}