NodeView.java

package ch.hsr.ifs.pasta;

import java.util.Dictionary;
import java.util.Hashtable;

import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.part.ViewPart;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventConstants;
import org.osgi.service.event.EventHandler;

import ch.hsr.ifs.pasta.events.PastaEventConstants;

public class NodeView extends ViewPart {

	@Override
	public void createPartControl(final Composite parent) {
		final NodeWidget nodeWidget = new NodeWidget(parent);
		registerEventHandler(PastaEventConstants.ASTNODE, new EventHandler() {

			@Override
			public void handleEvent(final Event event) {
				final IASTNode astNode = (IASTNode) event.getProperty(PastaEventConstants.ASTNODE);
				if (astNode != null) {
					nodeWidget.displayNode(astNode);
				}
			}
		});
	}

	@Override
	public void setFocus() {
	}

	private void registerEventHandler(final String topic, final EventHandler handler) {
		final BundleContext ctx = FrameworkUtil.getBundle(ASTView.class).getBundleContext();
		final Dictionary<String, String> props = new Hashtable<>();
		props.put(EventConstants.EVENT_TOPIC, topic);
		ctx.registerService(EventHandler.class.getName(), handler, props);
	}
}