examples/org.eclipse.ui.examples.contributions/src/org/eclipse/ui/examples/contributions/view/SwapInfoHandler.java

/*******************************************************************************
 * Copyright (c) 2007 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/

package org.eclipse.ui.examples.contributions.view;

import java.util.Iterator;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.examples.contributions.model.Person;
import org.eclipse.ui.handlers.HandlerUtil;

/**
 * Swap 2 elements around in the the view.
 * 
 * @since 3.3
 */
public class SwapInfoHandler extends AbstractHandler {

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands.ExecutionEvent)
	 */
	public Object execute(ExecutionEvent event) throws ExecutionException {
		InfoView view = (InfoView) HandlerUtil.getActivePartChecked(event);
		ISelection sel = HandlerUtil.getCurrentSelection(event);
		if (sel instanceof IStructuredSelection) {
			IStructuredSelection selection = (IStructuredSelection) sel;
			if (selection.size() != 2) {
				return null;
			}
			Iterator i = selection.iterator();
			Person p1 = (Person) i.next();
			Person p2 = (Person) i.next();
			view.swap(p1, p2);
		}
		return null;
	}

}