001 //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/enterprise/servlet/ServiceLookup.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.enterprise.servlet;
037
038 import java.util.HashMap;
039 import java.util.Iterator;
040 import java.util.Map;
041
042 import org.deegree.enterprise.ServiceException;
043 import org.deegree.framework.log.ILogger;
044 import org.deegree.framework.log.LoggerFactory;
045
046 /**
047 * look up class for deegree service handler. The class is implemented as singleton to ensure that
048 * only one instance and so just ine mapping is valid with a service instance
049 *
050 * @version $Revision: 18195 $
051 * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
052 * @author last edited by: $Author: mschneider $
053 *
054 * @version 1.0. $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18 Jun 2009) $
055 *
056 * @since 2.0
057 */
058 public class ServiceLookup {
059
060 private static final ILogger LOG = LoggerFactory.getLogger( ServiceLookup.class );
061
062 private static ServiceLookup lookup = null;
063
064
065 private static Map<String, Class<?>> services;
066
067 /**
068 * @return static wrapper for a private constructor
069 */
070 public static ServiceLookup getInstance() {
071 if ( lookup == null ) {
072 lookup = new ServiceLookup();
073 }
074 return lookup;
075 }
076
077 private ServiceLookup() {
078 services = new HashMap<String, Class<?>>();
079 }
080
081 /**
082 * Maps a web service to the given class
083 *
084 * @param key
085 * @param clss
086 */
087 public void addService( String key, Class<?> clss ) {
088 services.put( key, clss );
089 }
090
091 /**
092 * @param key
093 * to be removed
094 * @return the handler class to which the key is mapped
095 */
096 public Class<?> removeService( String key ) {
097 return services.remove( key );
098 }
099
100 /**
101 * @param key
102 * the webservice of interest
103 * @return its handler class
104 */
105 public Class<?> getService( String key ) {
106 return services.get( key );
107 }
108
109 /**
110 * @return an iterator over all the webservices names.
111 */
112 public Iterator<String> getIterator() {
113 return services.keySet().iterator();
114 }
115
116 /**
117 * @param serviceName
118 * @param requestIP
119 * @return the Handler of the webservice
120 * @throws ServiceException
121 */
122 public ServiceDispatcher getHandler( String serviceName, String requestIP )
123 throws ServiceException {
124 Class<?> handlerClass = services.get( serviceName );
125
126 if ( handlerClass == null ) {
127 throw new ServiceException( "Unknown service handler for " + "requested service:" //$NON-NLS-1$ //$NON-NLS-2$
128 + serviceName );
129 }
130 ServiceDispatcher handler = null;
131 try {
132 handler = (ServiceDispatcher) handlerClass.newInstance();
133 // Very dirty hack to get the ip to the handler.
134 if ( handler != null ) {
135 if ( "WCTS".equalsIgnoreCase( serviceName ) ) {
136 ( (WCTSHandler) handler ).setIP( requestIP );
137 }
138 }
139 LOG.logDebug( "Dispatching request to handler '" + handlerClass.getName() + "'." ); //$NON-NLS-1$ //$NON-NLS-2$
140 } catch ( Exception e ) {
141 LOG.logError( "Can't initialize OGC service:" + serviceName, e ); //$NON-NLS-1$
142 throw new ServiceException( "Can't initialize OGC service:" + serviceName ); //$NON-NLS-1$
143 }
144 return handler;
145 }
146
147 /**
148 * Clear the map
149 */
150 public void clear() {
151 services.clear();
152 }
153
154 }