/***************************************************************************
 * Copyright (c) 2007 Conselleria de Infraestructuras y Transporte,
 * Generalitat de la Comunitat Valenciana . 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: Mario Cervera Ubeda (Prodevelop)
 *
 ******************************************************************************/
package org.eclipse.papyrus.commands.wrappers;

import java.util.ArrayList;
import java.util.Collection;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.emf.common.command.AbstractCommand;
import org.eclipse.gmf.runtime.common.core.command.ICommand;

// TODO: Auto-generated Javadoc
/**
 * A EMF Command that wraps a GMF command. Each method is redirected to the GMF one.
 */
public class GMFtoEMFCommandWrapper extends AbstractCommand {

	/**
	 * 
	 * Wraps the GMF command return value to be returned by this method.
	 * 
	 * @return the possible return value from the GMF command
	 */
	@Override
	public Collection<?> getResult() {

		Collection<Object> result = new ArrayList<Object>();
		if(getGMFReturnValue() != null) {
			result.add(getGMFReturnValue());
		} // else return an empty collection

		return result;
	}

	private Object getGMFReturnValue() {
		if(getGMFCommand().getCommandResult() != null) {
			return getGMFCommand().getCommandResult().getReturnValue();
		}

		return null;
	}

	/**
	 * The wrapped GMF Command. Package-level visibility so that the command stack wrapper can
	 * access the field.
	 */
	private final ICommand gmfCommand;

	/**
	 * Constructor.
	 * 
	 * @param gmfCommand
	 *        the gmf command
	 */
	public GMFtoEMFCommandWrapper(ICommand gmfCommand) {
		super(gmfCommand.getLabel());
		this.gmfCommand = gmfCommand;
	}

	/**
	 * Returns the wrapped GMF command.
	 * 
	 * @return the GMF command
	 */
	// @unused
	public ICommand getGMFCommand() {
		return gmfCommand;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.emf.common.command.AbstractCommand#canExecute()
	 */
	@Override
	public boolean canExecute() {
		return gmfCommand.canExecute();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.emf.common.command.AbstractCommand#dispose()
	 */
	@Override
	public void dispose() {
		gmfCommand.dispose();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.emf.common.command.AbstractCommand#canUndo()
	 */
	@Override
	public boolean canUndo() {
		return gmfCommand.canUndo();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.emf.common.command.Command#execute()
	 */
	public void execute() {
		try {
			gmfCommand.execute(new NullProgressMonitor(), null);
		} catch (ExecutionException e) {
		}

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.emf.common.command.Command#redo()
	 */
	public void redo() {
		try {
			gmfCommand.redo(new NullProgressMonitor(), null);
		} catch (ExecutionException e) {
		}

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.emf.common.command.AbstractCommand#undo()
	 */
	@Override
	public void undo() {
		try {
			gmfCommand.undo(new NullProgressMonitor(), null);
		} catch (ExecutionException e) {
		}

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.emf.common.command.Command#getAffectedObjects()
	 */
	public Collection<?> getAffectedObjects() {
		return gmfCommand.getAffectedFiles();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.emf.common.command.Command#getDescription()
	 */
	public String getDescription() {
		return gmfCommand.getLabel();
	}

}