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/**
 * JOnAS: Java(TM) Open Application Server
 * Copyright (C) 2009 Bull S.A.S.
 * Contact: [email protected]
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *
 * --------------------------------------------------------------------------
 * $Id$
 * --------------------------------------------------------------------------
 */

package org.ow2.jonas.admin.osgi;

import javax.naming.InitialContext;

import org.osgi.framework.BundleContext;

public class OSGiManager {

    // -------------------------------------------------------------------------
    // Variables
    // -------------------------------------------------------------------------

    /**
     * JNDI bundleContext binding
     */
    public static final String BUNDLE_CONTEXT = "java:comp/env/BundleContext";

    /**
     * JNDI Naming context
     */
    private static InitialContext namingContext = null;

    /**
     * Bundle context that will be injected by the container.
     */
    private static BundleContext bundleContext = null;

    // -------------------------------------------------------------------------
    // Constructors
    // -------------------------------------------------------------------------

    /**
     * Build a new OSGi manager
     */
    public OSGiManager() {
    }

    // -------------------------------------------------------------------------
    // Implementation of IOSGiManager
    // -------------------------------------------------------------------------

    /**
     * Get the OSGi bundleContext
     *
     * @return the BundleContext object
     * @throws Exception if it could not be retrieved
     */
    public static BundleContext getBundleContext() throws Exception {
        if (bundleContext == null) {
            try {
                retrieveBundleContext();
            } catch (Exception e) {
                throw (new Exception("Could not retrieve BundleContext", e));
            }
        }
        return bundleContext;
    }

    // -------------------------------------------------------------------------
    // Private methods
    // -------------------------------------------------------------------------

    /**
     * Retrieve OSGi bundle context with a JNDI lookup. FIXME introduces a high
     * coupling with JOnAS
     *
     * @throws Exception if the JNDI lookup failed
     */
    private static void retrieveBundleContext() throws Exception {
        namingContext = new InitialContext();
        try {
            bundleContext = (BundleContext) namingContext.lookup(BUNDLE_CONTEXT);
        } catch (Exception e) {
            throw (new Exception("Could not lookup BundleContext", e));
        }
    }

}