    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_testing/src/org/deegree/framework/jndi/JndiUtils.java $
    002    /*----------------------------------------------------------------------------
    003     This file is part of deegree, http://deegree.org/
    004     Copyright (C) 2001-2009 by:
    005       Department of Geography, University of Bonn
    006     and
    007       lat/lon GmbH
    008
    009     This library is free software; you can redistribute it and/or modify it under
    010     the terms of the GNU Lesser General Public License as published by the Free
    011     Software Foundation; either version 2.1 of the License, or (at your option)
    012     any later version.
    013     This library is distributed in the hope that it will be useful, but WITHOUT
    014     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    015     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
    016     details.
    017     You should have received a copy of the GNU Lesser General Public License
    018     along with this library; if not, write to the Free Software Foundation, Inc.,
    019     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    020
    021     Contact information:
    022
    023     lat/lon GmbH
    024     Aennchenstr. 19, 53177 Bonn
    025     Germany
    026     http://lat-lon.de/
    027
    028     Department of Geography, University of Bonn
    029     Prof. Dr. Klaus Greve
    030     Postfach 1147, 53001 Bonn
    031     Germany
    032     http://www.geographie.uni-bonn.de/deegree/
    033
    034     e-mail: info@deegree.org
    035    ----------------------------------------------------------------------------*/
    036    package org.deegree.framework.jndi;
    037
    038    // J2EE 1.3
    039
    040    import javax.naming.Context;
    041    import javax.naming.InitialContext;
    042    import javax.naming.NamingEnumeration;
    043    import javax.naming.NamingException;
    044    import javax.rmi.PortableRemoteObject;
    045
    046    /**
    047     * Utility class for retrieving home interfaces and environment values.
    048     *
    049     * @author <a href="mailto:tfr@users.sourceforge.net">Torsten Friebe</A>
    050     * @author last edited by: $Author: mschneider $
    051     *
    052     * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $
    053     */
    054    public final class JndiUtils {
    055
    056        /**
    057         * Default constructor is hidden to protect this class from unwanted instantiation.
    058         */
    059        private JndiUtils() {
    060            // nothing to do
    061        }
    062
    063        /**
    064         * Lookup using <b>no</b> caching functionality.
    065         *
    066         * @param name
    067         *            the environment name
    068         * @param classForNarrow
    069         *            the class to narrow
    070         * @return if an entry exists, an instance of the given class with a value retrieved from the JNDI tree otherwise
    071         *         <code>null</code>.
    072         * @throws NamingException
    073         */
    074        public static Object lookup( String name, Class<?> classForNarrow )
    075                                throws NamingException {
    076            return PortableRemoteObject.narrow( JndiUtils.getInitialContext().lookup( name ), classForNarrow );
    077        }
    078
    079        /**
    080         * Lookup at Enterprise Java Beans environment value. For home interfaces use EJBRemoteFactory instead.
    081         *
    082         * @param name
    083         *            the environment name
    084         * @param classForNarrow
    085         *            the class to narrow
    086         * @return if an entry exists, an instance of the given class with a value retrieved from the JNDI tree otherwise
    087         *         <code>null</code>.
    088         * @throws NamingException
    089         *             if the given lookup name is not in the JNDI tree
    090         */
    091        public static Object lookupEnv( String name, Class<?> classForNarrow )
    092                                throws NamingException {
    093            return lookup( "java:/comp/env/" + name, classForNarrow );
    094        }
    095
    096        /**
    097         * Returns a list of naming entries for the given root node.
    098         *
    099         * @param rootNode
    100         * @return list of naming entries
    101         * @throws NamingException
    102         *             when the given root node doesn't exists
    103         */
    104        public static NamingEnumeration<?> getNamingList( String rootNode )
    105                                throws NamingException {
    106            return JndiUtils.getInitialContext().listBindings( rootNode );
    107        }
    108
    109        /**
    110         * Returns the initial context for this application.
    111         *
    112         * @return the inital context for this appication. This depends on the system environment.
    113         *
    114         * @throws NamingException
    115         *             if the context is not available
    116         */
    117        private static Context getInitialContext()
    118                                throws NamingException {
    119            return ( new InitialContext() );
    120        }
    121    }