org.eclipse.osbp.vaaclipse.presentation/src/org/eclipse/osbp/vaaclipse/presentation/utils/HierarchyUtils.java

/*******************************************************************************
 * Copyright (c) 2012 Rushan R. Gilmullin 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:
 *     Rushan R. Gilmullin - initial API and implementation
 *******************************************************************************/

package org.eclipse.osbp.vaaclipse.presentation.utils;

import org.eclipse.e4.ui.model.application.ui.MElementContainer;
import org.eclipse.e4.ui.model.application.ui.MUIElement;
import org.eclipse.e4.ui.model.application.ui.basic.MPartSashContainer;
import org.eclipse.e4.ui.model.application.ui.basic.MPartStack;

/**
 * @author rushan
 *
 */
public class HierarchyUtils {
	/**
	 * Recursively search in container the top right stack (the stack locatied
	 * in top right corner), i.e. the stack with top right corner is mathced
	 * with top right corner of container (area).
	 * 
	 * @param container
	 *            - input container (area)
	 * @return the top right part stack
	 */
	public static MPartStack findTopLeftFolder(MUIElement container) {
		if (container instanceof MPartStack)
			return (MPartStack) container;
		else if (container instanceof MPartSashContainer) {
			MPartSashContainer sash = (MPartSashContainer) container;

			if (sash.getChildren().isEmpty())
				return null;
			else if (sash.getChildren().size() == 1)
				return findTopLeftFolder((MElementContainer) sash.getChildren()
						.get(0));
			else if (sash.isHorizontal()
					&& sash.getChildren().get(1) instanceof MElementContainer<?>)
				return findTopLeftFolder((MElementContainer) sash.getChildren()
						.get(1));
			else if (!sash.isHorizontal()
					&& sash.getChildren().get(0) instanceof MElementContainer<?>)
				return findTopLeftFolder((MElementContainer) sash.getChildren()
						.get(0));
		}

		return null;
	}
}