examples/org.eclipse.graphiti.examples.composite/src/org/eclipse/graphiti/examples/composite/dialog/PreviewDiagramHandler.java

/*********************************************************************
* Copyright (c) 2013, 2019 Felix Velasco.
*
* This program and the accompanying materials are made
* available under the terms of the Eclipse Public License 2.0
* which is available at https://www.eclipse.org/legal/epl-2.0/
*
* Contributors:
*    fvelasco - Initial version
*
* SPDX-License-Identifier: EPL-2.0
**********************************************************************/
package org.eclipse.graphiti.examples.composite.dialog;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.handlers.HandlerUtil;

/**
 * Handler that is registered on the selection of 2 diagram files and opens the
 * dialog that displays these diagrams.
 * 
 * @since 0.10
 */
public class PreviewDiagramHandler extends AbstractHandler implements IHandler {

	public Object execute(ExecutionEvent event) throws ExecutionException {
		IStructuredSelection currentSelection = (IStructuredSelection) HandlerUtil.getCurrentSelection(event);
		Object[] elements = currentSelection.toArray();

		IResource res1 = (IResource) Platform.getAdapterManager().getAdapter(elements[0], IResource.class);
		IResource res2 = (IResource) Platform.getAdapterManager().getAdapter(elements[1], IResource.class);

		if (res1 != null && res2 != null) {

			DoubleDiagramDialog dialog = new DoubleDiagramDialog(
					PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), res1, res2);
			dialog.open();
		}
		return null;
	}
}