001 //$HeadURL: svn+ssh://rbezema@svn.wald.intevation.org/deegree/base/branches/2.2_testing/src/org/deegree/enterprise/servlet/ServiceLookup.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 Aennchenstr. 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.enterprise.servlet;
044
045 import java.util.HashMap;
046 import java.util.Iterator;
047 import java.util.Map;
048
049 import org.deegree.enterprise.ServiceException;
050 import org.deegree.framework.log.ILogger;
051 import org.deegree.framework.log.LoggerFactory;
052
053 /**
054 * look up class for deegree service handler. The class is
055 * implemented as singleton to ensure that only one instance and
056 * so just ine mapping is valid with a service instance
057 *
058 * @version $Revision: 9338 $
059 * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
060 * @author last edited by: $Author: apoth $
061 *
062 * @version 1.0. $Revision: 9338 $, $Date: 2007-12-27 13:31:31 +0100 (Do, 27 Dez 2007) $
063 *
064 * @since 2.0
065 */
066 public class ServiceLookup {
067
068 private static final ILogger LOG = LoggerFactory.getLogger( ServiceLookup.class );
069
070 private static ServiceLookup lookup = null;
071
072 private static Map<String, Class> services;
073
074 /**
075 * @return static wrapper for a private constructor
076 */
077 public static ServiceLookup getInstance() {
078 if ( lookup == null ) {
079 lookup = new ServiceLookup();
080 }
081 return lookup;
082 }
083
084 private ServiceLookup() {
085 services = new HashMap<String, Class>();
086 }
087
088 /**
089 * Maps a web service to the given class
090 * @param key
091 * @param clss
092 */
093 public void addService(String key, Class clss) {
094 services.put( key, clss );
095 }
096
097 /**
098 * @param key to be removed
099 * @return the handler class to which the key is mapped
100 */
101 public Class removeService(String key) {
102 return services.remove( key );
103 }
104
105 /**
106 * @param key the webservice of interest
107 * @return its handler class
108 */
109 public Class getService(String key) {
110 return services.get( key );
111 }
112
113 /**
114 * @return an iterator over all the webservices names.
115 */
116 public Iterator getIterator() {
117 return services.keySet().iterator();
118 }
119
120 /**
121 * @param serviceName
122 * @return the Handler of the webservice
123 * @throws ServiceException
124 */
125 public ServiceDispatcher getHandler(String serviceName) throws ServiceException {
126 Class handlerClass = services.get( serviceName );
127
128 if ( handlerClass == null ) {
129 throw new ServiceException( "Unknown service handler for " + "requested service:" //$NON-NLS-1$ //$NON-NLS-2$
130 + serviceName );
131 }
132 ServiceDispatcher handler = null;
133 try {
134 handler = (ServiceDispatcher) handlerClass.newInstance();
135 LOG.logDebug( "Dispatching request to handler '" + handlerClass.getName() + "'." ); //$NON-NLS-1$ //$NON-NLS-2$
136 } catch ( Exception e ) {
137 LOG.logError( "Can't initialize OGC service:" + serviceName, e ); //$NON-NLS-1$
138 throw new ServiceException( "Can't initialize OGC service:" + serviceName ); //$NON-NLS-1$
139 }
140 return handler;
141 }
142
143 /**
144 * Clear the map
145 */
146 public void clear() {
147 services.clear();
148 }
149
150 }