plugins/org.eclipse.app4mc.visualization.ui/src/org/eclipse/app4mc/visualization/ui/handler/AmaltheaModelElementExpression.java

/*********************************************************************************
 * Copyright (c) 2020 Robert Bosch GmbH and others.
 *
 * 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/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Robert Bosch GmbH - initial API and implementation
 ********************************************************************************
 */ 
package org.eclipse.app4mc.visualization.ui.handler;

import javax.inject.Named;

import org.eclipse.app4mc.amalthea.model.AmaltheaPackage;
import org.eclipse.e4.core.di.annotations.Evaluate;
import org.eclipse.e4.core.di.annotations.Optional;
import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.viewers.IStructuredSelection;

/**
 * Imperative expression implementation that checks if the current active selection is an Amalthea model element.
 */
public class AmaltheaModelElementExpression {
	
	@Evaluate
	public boolean evaluate(@Optional @Named(IServiceConstants.ACTIVE_SELECTION) IStructuredSelection selection) {
		if (selection != null && !selection.isEmpty() 
				&& selection.getFirstElement() instanceof EObject
				&& ((EObject)selection.getFirstElement()).eClass().getEPackage().equals(AmaltheaPackage.eINSTANCE)) {
			return true;
		}
		return false;
	}
}