examples/org.eclipse.graphiti.examples.common/src/org/eclipse/graphiti/examples/common/handler/OpenDiagramEditorFromFileHandler.java

/*********************************************************************
* Copyright (c) 2005, 2019 SAP SE
*
* 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/
*
* Contributors:
*    SAP SE - initial API, implementation and documentation
*
* SPDX-License-Identifier: EPL-2.0
**********************************************************************/
package org.eclipse.graphiti.examples.common.handler;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.emf.common.ui.URIEditorInput;
import org.eclipse.emf.common.util.URI;
import org.eclipse.graphiti.examples.common.Messages;
import org.eclipse.graphiti.ui.editor.DiagramEditor;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.handlers.HandlerUtil;

/**
 * Creates sample data
 */
public final class OpenDiagramEditorFromFileHandler extends AbstractHandler {

	public Object execute(final ExecutionEvent event) throws ExecutionException {

		// Get the current selection
		ISelection selection = HandlerUtil.getCurrentSelection(event);
		if (!(selection instanceof IStructuredSelection)) {
			return null;
		}

		// Operation must be started on IProject node -> cancel if not
		Object first = ((IStructuredSelection) selection).getFirstElement();
		if (!(first instanceof IProject)) {
			return null;
		}

		// Ask for the file to open
		FileDialog dialog = new FileDialog(Display.getCurrent().getActiveShell(), SWT.OPEN);
		dialog.setFilterExtensions(new String[] { "*.diagram", "*.*" }); //$NON-NLS-1$ //$NON-NLS-2$
		dialog.setFilterIndex(0);
		dialog.setText(Messages.OpenDiagramFromFileHandler_DialogTitle);
		String fileName = dialog.open();
		if (fileName == null) {
			// Cancelled
			return null;
		}

		// Create URI and editor input
		URI fileURI = URI.createFileURI(fileName);
		URIEditorInput editorInput = new URIEditorInput(fileURI);

		// Open the editor
		try {
			PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().openEditor(editorInput, DiagramEditor.DIAGRAM_EDITOR_ID);
		} catch (PartInitException e) {
			IStatus status = new Status(IStatus.ERROR, "org.eclipse.graphiti.examples.tutorial", e.getMessage(), e); //$NON-NLS-1$
			ErrorDialog.openError(Display.getCurrent().getActiveShell(), Messages.OpenDiagramFromFileHandler_OpenEditorError,
					e.getMessage(), status);
			return null;
		}

		return null;
	}
}