ingo@100: /*
ingo@100:  * Copyright (c) 2010 by Intevation GmbH
ingo@100:  *
ingo@100:  * This program is free software under the LGPL (>=v2.1)
ingo@100:  * Read the file LGPL.txt coming with the software for details
ingo@100:  * or visit http://www.gnu.org/licenses/ if it does not exist.
ingo@100:  */
ingo@100: 
sascha@69: package de.intevation.artifactdatabase;
sascha@69: 
sascha@93: import de.intevation.artifacts.Service;
sascha@93: import de.intevation.artifacts.ServiceFactory;
sascha@93: 
sascha@93: import org.apache.log4j.Logger;
sascha@93: 
sascha@69: import org.w3c.dom.Document;
sascha@69: import org.w3c.dom.Node;
sascha@69: 
sascha@69: /**
sascha@89:  * Trivial implementation of the ServiceFactory interface.
sascha@89:  * Name and an description are configured by the given Node given to
sascha@89:  * #setup(Document, Node) via the 'name' and 'description' attributes.
sascha@89:  * The name of the class that provides the concrete serice is configured
sascha@89:  * by the 'service' attribute.
sascha@90:  *
sascha@77:  * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
sascha@69:  */
sascha@69: public class DefaultServiceFactory
sascha@69: implements   ServiceFactory
sascha@69: {
sascha@69:     private static Logger logger =
sascha@69:         Logger.getLogger(DefaultServiceFactory.class);
sascha@69: 
sascha@89:     /**
sascha@89:      * XPath to access the name of the service.
sascha@89:      */
sascha@69:     public static final String XPATH_NAME        = "@name";
sascha@89:     /**
sascha@89:      * XPath to access the description of the service.
sascha@89:      */
sascha@69:     public static final String XPATH_DESCRIPTION = "@description";
sascha@89:     /**
sascha@89:      * XPath to access the class name of the service to be build by
sascha@89:      * this factory.
sascha@89:      */
sascha@69:     public static final String XPATH_SERVICE     = "@service";
sascha@69: 
sascha@89:     /**
sascha@89:      * Default description if no description is given in configuration.
sascha@89:      */
sascha@69:     public static final String DEFAULT_DESCRIPTION =
sascha@69:         "No description available";
sascha@69: 
sascha@89:     /**
sascha@89:      * Loaded service class if no class name is given in the configuration.
sascha@89:      */
sascha@69:     public static final String DEFAULT_SERVICE =
sascha@69:         "de.intevation.artifactdatabase.DefaultService";
sascha@69: 
sascha@89:     /**
sascha@89:      * The name of the service factory.
sascha@89:      */
sascha@69:     protected String name;
sascha@69: 
sascha@89:     /**
sascha@89:      * The description of the service factory.
sascha@89:      */
sascha@69:     protected String description;
sascha@69: 
sascha@89:     /**
sascha@89:      * The loaded class used to build the concrete service.
sascha@89:      */
sascha@69:     protected Class  serviceClass;
sascha@69: 
sascha@89:     /**
sascha@89:      * Default constructor.
sascha@89:      */
sascha@69:     public DefaultServiceFactory() {
sascha@69:     }
sascha@69: 
sascha@69:     public String getName() {
sascha@69:         return name;
sascha@69:     }
sascha@69: 
sascha@69:     public String getDescription() {
sascha@69:         return description;
sascha@69:     }
sascha@69: 
sascha@69:     public Service createService(Object globalContext) {
sascha@69:         try {
sascha@69:             Service service = (Service)serviceClass.newInstance();
sascha@69: 
sascha@69:             service.setup(this, globalContext);
sascha@69: 
sascha@69:             return service;
sascha@69:         }
sascha@69:         catch (InstantiationException ie) {
sascha@69:             logger.error(ie.getLocalizedMessage(), ie);
sascha@69:         }
sascha@69:         catch (IllegalAccessException iae) {
sascha@69:             logger.error(iae.getLocalizedMessage(), iae);
sascha@69:         }
sascha@69:         catch (ClassCastException cce) {
sascha@69:             logger.error(cce.getLocalizedMessage(), cce);
sascha@69:         }
sascha@69: 
sascha@69:         return null;
sascha@69:     }
sascha@69: 
sascha@69:     public void setup(Document config, Node factoryNode) {
sascha@69: 
sascha@69:         description = Config.getStringXPath(
sascha@69:             factoryNode, XPATH_DESCRIPTION, DEFAULT_DESCRIPTION);
sascha@69: 
sascha@69:         name = Config.getStringXPath(
sascha@69:             factoryNode, XPATH_NAME, toString());
sascha@69: 
sascha@69:         String service = Config.getStringXPath(
sascha@69:             factoryNode, XPATH_SERVICE, DEFAULT_SERVICE);
sascha@69: 
sascha@69:         try {
sascha@69:             serviceClass = Class.forName(service);
sascha@69:         }
sascha@69:         catch (ClassNotFoundException cnfe) {
sascha@69:             logger.error(cnfe.getLocalizedMessage(), cnfe);
sascha@69:         }
sascha@69: 
sascha@69:         if (serviceClass == null) {
sascha@69:             serviceClass = DefaultService.class;
sascha@69:         }
sascha@69:     }
sascha@69: }
sascha@69: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :