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/*
 * 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.tika.config;

import org.apache.tika.detect.Detector;
import org.apache.tika.parser.Parser;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;

/**
 * Bundle activator that adjust the class loading mechanism of the
 * {@link ServiceLoader} class to work correctly in an OSGi environment.
 * 
 * Note that you should not access this class directly.
 * Instead the OSGi environment (if present) will automatically invoke the
 * methods of this class based on the Bundle-Activator setting in the bundle
 * manifest.
 *
 * @since Apache Tika 0.9
 */
public class TikaActivator implements BundleActivator, ServiceTrackerCustomizer {

    private ServiceTracker detectorTracker;

    private ServiceTracker parserTracker;

    private BundleContext bundleContext;
    //-----------------------------------------------------< BundleActivator >

    public void start(final BundleContext context) throws Exception {
        bundleContext = context;

        detectorTracker = new ServiceTracker(context, Detector.class.getName(), this);
        parserTracker = new ServiceTracker(context, Parser.class.getName(), this);

        detectorTracker.open();
        parserTracker.open();
    }

    public void stop(BundleContext context) throws Exception {
        parserTracker.close();
        detectorTracker.close();
    }

    public Object addingService(ServiceReference reference) {
        int rank = 0;
        Object property = reference.getProperty(Constants.SERVICE_RANKING);
        if (property instanceof Integer) {
            rank = (Integer) property;
        }

        Object service = bundleContext.getService(reference);
        ServiceLoader.addService(reference, service, rank);
        return service;
    }

    public void modifiedService(ServiceReference reference, Object service) {
    }

    public void removedService(ServiceReference reference, Object service) {
        ServiceLoader.removeService(reference);
        bundleContext.ungetService(reference);
    }

}