org.eclipse.osbp.vaaclipse.addons.application/src/org/eclipse/osbp/vaaclipse/addons/application/handler/AbstractHandler.java

/**
 * Copyright (c) 2011, 2014 - Lunifera GmbH (Gross Enzersdorf, Austria), Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 * 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: 
 * 		Florian Pirchner - Initial implementation
 */
package org.eclipse.osbp.vaaclipse.addons.application.handler;

import org.eclipse.core.commands.Command;
import org.eclipse.core.commands.ParameterizedCommand;
import org.eclipse.e4.core.contexts.Active;
import org.eclipse.e4.core.contexts.ContextInjectionFactory;
import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.core.di.annotations.CanExecute;
import org.eclipse.e4.ui.model.application.ui.MContext;
import org.eclipse.e4.ui.model.application.ui.basic.MPart;
import org.eclipse.osbp.vaaclipse.addons.common.api.di.EnabledState;

/**
 * The Class AbstractHandler.
 */
public class AbstractHandler {

	/**
	 * Instantiates a new abstract handler.
	 */
	public AbstractHandler() {
		super();
	}

	/**
	 * Creates the callback context.
	 *
	 * @param context
	 *            the context
	 * @param command
	 *            the command
	 * @return the i eclipse context
	 */
	protected IEclipseContext createCallbackContext(MContext context,
			Command command) {
		final IEclipseContext pmContext = context.getContext().createChild();
		pmContext.set("commandId", command.getId());
		return pmContext;
	}
	
	/**
	 * Can execute.
	 *
	 * @param context
	 *            the context
	 * @param part
	 *            the part
	 * @param command
	 *            the command
	 * @return true, if successful
	 */
	@CanExecute
	public boolean canExecute(@Active MContext context, @Active MPart part,
			ParameterizedCommand command) {
		final IEclipseContext pmContext = createCallbackContext(context,
				command.getCommand());
		boolean result = (Boolean) ContextInjectionFactory.invoke(part.getObject(), EnabledState.class,
				pmContext, Boolean.TRUE);
		return result;
	}

}