org.eclipse.gmf.runtime.diagram.ui/src/org/eclipse/gmf/runtime/diagram/ui/DiagramUtil.java

/******************************************************************************
 * Copyright (c) 2004, 2006 IBM Corporation 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:
 *    IBM Corporation - initial API and implementation 
 ****************************************************************************/

package org.eclipse.gmf.runtime.diagram.ui;

import java.util.Iterator;
import java.util.List;

import org.eclipse.gmf.runtime.common.ui.services.editor.EditorService;
import org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditorInput;
import org.eclipse.gmf.runtime.diagram.ui.parts.IDiagramWorkbenchPart;
import org.eclipse.gmf.runtime.notation.Diagram;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;

/**
 * Provides miscellaneous diagram utilities
 * 
 * @author melaasar, mmostafa
 */

public class DiagramUtil {

	/**
	 * Opens an editor for a given diagram
	 * 
	 * @param diagram
	 *            The diagram to be opened
	 */
	public static void openDiagramEditor(Diagram diagram) {
		EditorService.getInstance().openEditor(new DiagramEditorInput(diagram));
	}

	/**
	 * Rerturns an open editor for the given diagram in the given workbench
	 * window if the window is null, the active window in the platform is
	 * considered
	 * 
	 * @param diagram
	 *            The given diagram
	 * @param window
	 *            The given window (or null to mean the active one)
	 * @return An <code>IDiagramWorkbenchPart</code>
	 */
	public static IDiagramWorkbenchPart getOpenedDiagramEditor(Diagram diagram,
			IWorkbenchWindow window) {
		if (null == diagram)
			throw new NullPointerException("Argument 'diagram' is null"); //$NON-NLS-1$
		if (window == null)
			window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();

		List editors = EditorService.getInstance().getRegisteredEditorParts();
		for (Iterator j = editors.iterator(); j.hasNext();) {
			IEditorPart editor = (IEditorPart) j.next();
			if (editor.getEditorSite().getWorkbenchWindow() == window) {
                if (editor instanceof IDiagramWorkbenchPart) {
                    IDiagramWorkbenchPart de = (IDiagramWorkbenchPart) editor;
                    if (de.getDiagram() == diagram)
                        return de;
                }
			}
		}
		return null;
	}

}