/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.sling.ide.impl.vlt;

import org.apache.sling.ide.eclipse.core.ServiceUtil;
import org.apache.sling.ide.eclipse.core.debug.PluginLoggerRegistrar;
import org.apache.sling.ide.log.Logger;
import org.eclipse.core.runtime.Plugin;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
import org.osgi.util.tracker.ServiceTracker;

/**
 * The activator class controls the plug-in life cycle
 * 
 * <p>
 * Since the WST framework is based on Eclipse extension points, rather than OSGi services, this class provides a static
 * entry point to well-known services.
 * </p>
 */
public class Activator extends Plugin {

    // The plug-in ID
    public static final String PLUGIN_ID = "org.apache.sling.ide.impl-vlt"; //$NON-NLS-1$

	// The shared instance
	private static Activator plugin;

    private ServiceTracker<Logger, Logger> tracer;

    private ServiceRegistration<Logger> tracerRegistration;

	public void start(BundleContext context) throws Exception {
		super.start(context);
		plugin = this;

        tracerRegistration = PluginLoggerRegistrar.register(this);

        tracer = new ServiceTracker<>(context, tracerRegistration.getReference(), null);
        tracer.open();
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext context) throws Exception {

        tracerRegistration.unregister();

        tracer.close();

        plugin = null;
		super.stop(context);
	}

	/**
	 * Returns the shared instance
	 *
	 * @return the shared instance
	 */
	public static Activator getDefault() {
		return plugin;
	}

    public Logger getPluginLogger() {
        return (Logger) ServiceUtil.getNotNull(tracer);
    }
}