CreateDynamicInstanceAction.java

/*******************************************************************************
 * Copyright (c) 2013 THALES GLOBAL SERVICES 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:
 *     Obeo - initial API and implementation
 *******************************************************************************/
package org.eclipse.emf.ecoretools.design.ui.action;

import java.util.Collection;
import java.util.Map;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.Path;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.presentation.DynamicModelWizard;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.wizard.WizardDialog;
import org.eclipse.sirius.tools.api.ui.IExternalJavaAction;
import org.eclipse.sirius.viewpoint.DSemanticDecorator;
import org.eclipse.ui.PlatformUI;

/**
 * A dynamic action which can be invoked from the Viewpoint Ecore modeler to
 * create a dynamic instance of an EClass in the model being edited.
 * <p>
 * Most of the code has been takenh from
 * {@link org.eclipse.emf.ecore.action.CreateDynamicInstanceAction} and adapted
 * to be usable in the context of an {@link IExternalJavaAction}.
 * 
 * @author pcdavid
 */
public class CreateDynamicInstanceAction implements IExternalJavaAction {
	private static final URI PLATFORM_RESOURCE = URI.createPlatformResourceURI(
			"/", false);

	/**
	 * The action expects a single EClass as input.
	 */
	public boolean canExecute(Collection<? extends EObject> selections) {
		return getSemanticTarget(selections) != null;
	}

	private EClass getSemanticTarget(Collection<? extends EObject> selections) {
		if (selections == null || selections.size() != 1) {
			return null;
		} else {
			final EObject selection = selections.iterator().next();
			final EObject semanticTarget;
			if (selection instanceof DSemanticDecorator) {
				semanticTarget = ((DSemanticDecorator) selection).getTarget();
			} else {
				semanticTarget = selection;
			}
			if (semanticTarget instanceof EClass) {
				return (EClass) semanticTarget;
			} else {
				return null;
			}
		}
	}

	public void execute(Collection<? extends EObject> selections,
			Map<String, Object> parameters) {
		EClass eClass = getSemanticTarget(selections);
		URI uri = eClass.eResource().getURI();
		IStructuredSelection selection = StructuredSelection.EMPTY;
		if (uri != null && uri.isHierarchical()) {
			if (uri.isRelative()
					|| (uri = uri.deresolve(PLATFORM_RESOURCE)).isRelative()) {
				IFile file = ResourcesPlugin.getWorkspace().getRoot()
						.getFile(new Path(uri.toString()));
				if (file.exists()) {
					selection = new StructuredSelection(file);
				}
			}
		}

		DynamicModelWizard dynamicModelWizard = new DynamicModelWizard(eClass);
		dynamicModelWizard.init(PlatformUI.getWorkbench(), selection);
		dynamicModelWizard.setWindowTitle("Create Dynamic Instance");
		WizardDialog wizardDialog = new WizardDialog(PlatformUI.getWorkbench()
				.getActiveWorkbenchWindow().getShell(), dynamicModelWizard);

		wizardDialog.open();
	}
}