plugins/org.eclipse.app4mc.amalthea.model.editor.contribution/src/org/eclipse/app4mc/amalthea/model/editor/contribution/menu/ProcessingServiceExpression.java

/*********************************************************************************
 * Copyright (c) 2021 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.amalthea.model.editor.contribution.menu;

import javax.inject.Named;

import org.eclipse.app4mc.amalthea.model.editor.contribution.registry.ProcessingServiceRegistry;
import org.eclipse.e4.core.di.annotations.Evaluate;
import org.eclipse.e4.core.di.annotations.Optional;
import org.eclipse.e4.core.di.extensions.Service;
import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.jface.viewers.IStructuredSelection;

/**
 * Imperative expression implementation that checks if the current active selection is an Amalthea model element.
 */
@SuppressWarnings("restriction")
public class ProcessingServiceExpression extends AmaltheaModelElementExpression {

	@Evaluate
	public boolean evaluate(
			@Optional @Named(IServiceConstants.ACTIVE_SELECTION) IStructuredSelection selection,
			@Optional @Service ProcessingServiceRegistry registry) {

		if (super.evaluate(selection)) {
			// single element selected
			return !registry.getServices(selection.getFirstElement()).isEmpty();
		}

		return false;
	}

}