/*
 * Copyright 2012 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.storage.core;

import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;

import com.redhat.thermostat.storage.config.StartupConfiguration;

public class StorageProviderUtil {

    // FIXME: This should go away once GuiClientCommand and AgentApplication use
    // DbService via launcher for establishing a connection. I.e. those should just
    // specify isStorageRequired() == true and the launcher handles the rest
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static StorageProvider getStorageProvider(StartupConfiguration config) {
        Bundle bundle = FrameworkUtil.getBundle(StorageProviderUtil.class);
        BundleContext ctxt = bundle.getBundleContext();
        try {
            ServiceReference[] refs = ctxt.getServiceReferences(StorageProvider.class.getName(), null);
            for (int i = 0; i < refs.length; i++) {
                StorageProvider prov = (StorageProvider) ctxt.getService(refs[i]);
                prov.setConfig(config);
                if (prov.canHandleProtocol()) {
                    return prov;
                }
            }
        } catch (InvalidSyntaxException e) {
            // This should not happen since we use a null filter
            throw new AssertionError();
        }
        return null;
    }
}