providers/bundles/org.eclipse.ecf.provider.xmpp.ui/src/org/eclipse/ecf/internal/provider/xmpp/ui/Activator.java

package org.eclipse.ecf.internal.provider.xmpp.ui;

import org.eclipse.ecf.core.IContainerManager;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;
import org.osgi.util.tracker.ServiceTracker;

/**
 * The activator class controls the plug-in life cycle
 */
public class Activator extends AbstractUIPlugin {

	// The plug-in ID
	public static final String PLUGIN_ID = "org.eclipse.ecf.provider.xmpp.ui"; //$NON-NLS-1$

	// The shared instance
	private static Activator plugin;

	private BundleContext context = null;

	private ServiceTracker containerManagerTracker = null;

	/**
	 * The constructor
	 */
	public Activator() {
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext context) throws Exception {
		super.start(context);
		plugin = this;
		this.context = context;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext context) throws Exception {
		if (containerManagerTracker != null) {
			containerManagerTracker.close();
			containerManagerTracker = null;
		}
		plugin = null;
		this.context = null;
		super.stop(context);
	}

	/**
	 * Returns the shared instance
	 * 
	 * @return the shared instance
	 */
	public synchronized static Activator getDefault() {
		if (plugin == null) {
			plugin = new Activator();
		}
		return plugin;
	}

	/**
	 * @return container manager.
	 */
	public IContainerManager getContainerManager() {
		if (containerManagerTracker == null) {
			containerManagerTracker = new ServiceTracker(context, IContainerManager.class.getName(), null);
			containerManagerTracker.open();
		}
		return (IContainerManager) containerManagerTracker.getService();
	}

}