001 //$HeadURL: svn+ssh://rbezema@svn.wald.intevation.org/deegree/base/branches/2.2_testing/src/org/deegree/io/datastore/DatastoreRegistry.java $
002 /*---------------- FILE HEADER ------------------------------------------
003
004 This file is part of deegree.
005 Copyright (C) 2001-2008 by:
006 EXSE, Department of Geography, University of Bonn
007 http://www.giub.uni-bonn.de/deegree/
008 lat/lon GmbH
009 http://www.lat-lon.de
010
011 This library is free software; you can redistribute it and/or
012 modify it under the terms of the GNU Lesser General Public
013 License as published by the Free Software Foundation; either
014 version 2.1 of the License, or (at your option) any later version.
015
016 This library is distributed in the hope that it will be useful,
017 but WITHOUT ANY WARRANTY; without even the implied warranty of
018 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
019 Lesser General Public License for more details.
020
021 You should have received a copy of the GNU Lesser General Public
022 License along with this library; if not, write to the Free Software
023 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
024
025 Contact:
026
027 Andreas Poth
028 lat/lon GmbH
029 Aennchenstraße 19
030 53177 Bonn
031 Germany
032 E-Mail: poth@lat-lon.de
033
034 Prof. Dr. Klaus Greve
035 Department of Geography
036 University of Bonn
037 Meckenheimer Allee 166
038 53115 Bonn
039 Germany
040 E-Mail: greve@giub.uni-bonn.de
041
042 ---------------------------------------------------------------------------*/
043 package org.deegree.io.datastore;
044
045 import java.util.HashMap;
046 import java.util.Map;
047 import java.util.MissingResourceException;
048 import java.util.ResourceBundle;
049
050 import org.deegree.i18n.Messages;
051
052 /**
053 * Responsible for the lookup of {@link Datastore} instances by their configuration information.
054 * <p>
055 * This is necessary to ensure that application schemas which use the same backend and identical
056 * configuration information are served by the same {@link Datastore} instance.
057 *
058 * @author <a href="mailto:schneider@lat-lon.de">Markus Schneider </a>
059 * @author last edited by: $Author: apoth $
060 *
061 * @version $Revision: 9342 $, $Date: 2007-12-27 13:32:57 +0100 (Do, 27 Dez 2007) $
062 */
063 public class DatastoreRegistry {
064
065 private static final String BUNDLE_NAME = "org.deegree.io.datastore.datastores";
066
067 private static final ResourceBundle RESOURCE_BUNDLE = ResourceBundle.getBundle( BUNDLE_NAME );
068
069 private static Map<DatastoreConfiguration, Datastore> dsMap = new HashMap<DatastoreConfiguration, Datastore>();
070
071 /**
072 * Returns the {@link Class} of a {@link Datastore} identified by the passed name. The mapping
073 * between common names and Datastore classes is stored in the file
074 * <code>org.deegree.io.datastore.datastores.datastore.properties</code>.
075 *
076 * @param commonName
077 * @return Datastore class
078 * @throws IllegalArgumentException
079 */
080 public static Class getDatastoreClass( String commonName )
081 throws IllegalArgumentException {
082 Class datastoreClass = null;
083 String className = null;
084 try {
085 className = RESOURCE_BUNDLE.getString( commonName );
086 datastoreClass = Class.forName( className );
087 } catch ( MissingResourceException e ) {
088 String msg = Messages.getMessage( "DATASTORE_REGISTRY_BACKEND_UNKNOWN", commonName,
089 BUNDLE_NAME );
090 throw new IllegalArgumentException( msg );
091 } catch ( ClassNotFoundException e ) {
092 throw new IllegalArgumentException( "Could not instantiate datastore class '"
093 + className + ": " + e.getMessage() );
094 }
095 return datastoreClass;
096 }
097
098 /**
099 * Returns the {@link Datastore} instance that serves the given {@link DatastoreConfiguration}.
100 *
101 * @param config
102 * @return Datastore instance or null, if no Datastore is registered for this configuration
103 */
104 public static Datastore getDatastore( DatastoreConfiguration config ) {
105 return dsMap.get( config );
106 }
107
108 /**
109 * Registers a new {@link Datastore} instance.
110 *
111 * @param ds
112 * @throws DatastoreException if Datastore for configuration is already registered
113 */
114 public static synchronized void registerDatastore( Datastore ds )
115 throws DatastoreException {
116 if ( dsMap.get( ds.getConfiguration() ) != null ) {
117 String msg = Messages.getMessage( "DATASTORE_REGISTRY_ALREADY_REGISTERED",
118 ds.getConfiguration() );
119 throw new DatastoreException( msg );
120 }
121 dsMap.put( ds.getConfiguration(), ds );
122 }
123
124 /**
125 * Returns the {@link Datastore} instance that serves the given {@link DatastoreConfiguration}
126 * from the registry.
127 *
128 * @param config
129 * @throws DatastoreException if no Datastore for configuration is registered
130 */
131 public static synchronized void deregisterDatastore( DatastoreConfiguration config )
132 throws DatastoreException {
133 if ( dsMap.get( config ) != null ) {
134 String msg = Messages.getMessage( "DATASTORE_REGISTRY_NOT_REGISTERED", config );
135 throw new DatastoreException( msg );
136 }
137 }
138 }