    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_testing/src/org/deegree/io/datastore/DatastoreRegistry.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.io.datastore;
    037
    038    import java.util.HashMap;
    039    import java.util.Map;
    040    import java.util.MissingResourceException;
    041    import java.util.ResourceBundle;
    042
    043    import org.deegree.i18n.Messages;
    044
    045    /**
    046     * Responsible for the lookup of {@link Datastore} instances by their configuration information.
    047     * <p>
    048     * This is necessary to ensure that application schemas which use the same backend and identical
    049     * configuration information are served by the same {@link Datastore} instance.
    050     *
    051     * @author <a href="mailto:schneider@lat-lon.de">Markus Schneider </a>
    052     * @author last edited by: $Author: mschneider $
    053     *
    054     * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $
    055     */
    056    public class DatastoreRegistry {
    057
    058        private static final String BUNDLE_NAME = "org.deegree.io.datastore.datastores";
    059
    060        private static final ResourceBundle RESOURCE_BUNDLE = ResourceBundle.getBundle( BUNDLE_NAME );
    061
    062        private static Map<DatastoreConfiguration, Datastore> dsMap = new HashMap<DatastoreConfiguration, Datastore>();
    063
    064        /**
    065         * Returns the {@link Class} of a {@link Datastore} identified by the passed name. The mapping
    066         * between common names and Datastore classes is stored in the file
    067         * <code>org.deegree.io.datastore.datastores.datastore.properties</code>.
    068         *
    069         * @param commonName
    070         * @return Datastore class
    071         * @throws IllegalArgumentException
    072         */
    073        @SuppressWarnings("unchecked")
    074        public static Class<Datastore> getDatastoreClass( String commonName )
    075                                throws IllegalArgumentException {
    076            Class<Datastore> datastoreClass = null;
    077            String className = null;
    078            try {
    079                className = RESOURCE_BUNDLE.getString( commonName );
    080                datastoreClass = (Class<Datastore>) Class.forName( className );
    081            } catch ( MissingResourceException e ) {
    082                String msg = Messages.getMessage( "DATASTORE_REGISTRY_BACKEND_UNKNOWN", commonName, BUNDLE_NAME );
    083                throw new IllegalArgumentException( msg );
    084            } catch ( ClassNotFoundException e ) {
    085                throw new IllegalArgumentException( "Could not instantiate datastore class '" + className + ": "
    086                                                    + e.getMessage() );
    087            }
    088            return datastoreClass;
    089        }
    090
    091        /**
    092         * Returns the {@link Datastore} instance that serves the given {@link DatastoreConfiguration}.
    093         *
    094         * @param config
    095         * @return Datastore instance or null, if no Datastore is registered for this configuration
    096         */
    097        public static Datastore getDatastore( DatastoreConfiguration config ) {
    098            return dsMap.get( config );
    099        }
    100
    101        /**
    102         * Registers a new {@link Datastore} instance.
    103         *
    104         * @param ds
    105         * @throws DatastoreException
    106         *             if Datastore for configuration is already registered
    107         */
    108        public static synchronized void registerDatastore( Datastore ds )
    109                                throws DatastoreException {
    110            if ( dsMap.get( ds.getConfiguration() ) != null ) {
    111                String msg = Messages.getMessage( "DATASTORE_REGISTRY_ALREADY_REGISTERED", ds.getConfiguration() );
    112                throw new DatastoreException( msg );
    113            }
    114            dsMap.put( ds.getConfiguration(), ds );
    115        }
    116
    117        /**
    118         * Returns the {@link Datastore} instance that serves the given {@link DatastoreConfiguration}
    119         * from the registry.
    120         *
    121         * @param config
    122         * @throws DatastoreException
    123         *             if no Datastore for configuration is registered
    124         */
    125        public static synchronized void deregisterDatastore( DatastoreConfiguration config )
    126                                throws DatastoreException {
    127            if ( dsMap.get( config ) != null ) {
    128                String msg = Messages.getMessage( "DATASTORE_REGISTRY_NOT_REGISTERED", config );
    129                throw new DatastoreException( msg );
    130            }
    131        }
    132    }