BpmnModelViewerSelectionListener.java

/******************************************************************************* 
 * Copyright (c) 2011 Red Hat, Inc. 
 *  All rights reserved. 
 * This program is 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: 
 * Red Hat, Inc. - initial API and implementation 
 ******************************************************************************/
package org.eclipse.bpmn2.modeler.ui.views;

import java.io.IOException;

import org.eclipse.bpmn2.modeler.core.ModelHandler;
import org.eclipse.bpmn2.modeler.core.ModelHandlerLocator;
import org.eclipse.bpmn2.modeler.ui.editor.BPMN2Editor;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.ui.ISelectionListener;
import org.eclipse.ui.IWorkbenchPart;

class BpmnModelViewerSelectionListener implements ISelectionListener {
	private final ViewContentProvider contentProvider;
	private BPMN2Editor editor;
	private final TreeViewer viewer;

	public BpmnModelViewerSelectionListener(TreeViewer viewer) {
		this.viewer = viewer;
		this.contentProvider = (ViewContentProvider) viewer.getContentProvider();
	}

	@Override
	public void selectionChanged(IWorkbenchPart part, ISelection selection) {

		if (part instanceof BPMN2Editor) {
			editor = (BPMN2Editor) part;
			try {
				ModelHandler modelHandler = ModelHandlerLocator.getModelHandler(editor.getDiagramTypeProvider()
						.getDiagram().eResource());
				contentProvider.updateModel(modelHandler);
				viewer.refresh(true);
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		Object[] selected = contentProvider.getSelected(selection);
		if (selected != null) {
			viewer.setSelection(new StructuredSelection(selected), true);
		}
	}
}