package org.simantics.district.network.ui.internal;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.util.tracker.ServiceTracker;
import org.simantics.district.network.ui.breakdown.SubgraphProvider;

public class Activator implements BundleActivator {

    public static final String PLUGIN_ID = "org.simantics.district.network.ui";
    private static Activator instance;
    private static BundleContext context;
    private ServiceTracker<SubgraphProvider, SubgraphProvider> subgraphProviderTracker;

    @Override
    public void start(BundleContext context) throws Exception {
        Activator.instance = this;
        Activator.context = context;

        subgraphProviderTracker = new ServiceTracker<>(context, SubgraphProvider.class.getName(), null);
        subgraphProviderTracker.open();
    }

    @Override
    public void stop(BundleContext context) throws Exception {
        subgraphProviderTracker.close();

        Activator.instance = null;
        Activator.context = null;
    }

    public static Activator getInstance() {
        return instance;
    }

    public static BundleContext getContext() {
        return context;
    }

    public SubgraphProvider[] getSubgraphProviders() {
        return subgraphProviderTracker.getServices(new SubgraphProvider[0]);
    }

}