tim@335: package de.intevation.gnv.state;
tim@335: 
sascha@779: import de.intevation.gnv.artifacts.GNVArtifactBase;
sascha@779: 
tim@335: import org.apache.log4j.Logger;
sascha@779: 
tim@335: import org.w3c.dom.Node;
tim@335: 
tim@335: /**
ingo@796:  * This factory should be used to create new state objects with help of a
ingo@796:  * configuration segment.
ingo@796:  * 
sascha@780:  * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
sascha@778:  *
tim@335:  */
tim@335: public class StateFactory {
tim@335: 
tim@335:     /**
tim@335:      * the logger, used to log exceptions and additonaly information
tim@335:      */
tim@335:     private static Logger log = Logger.getLogger(GNVArtifactBase.class);
tim@335: 
tim@335:     private static StateFactory instance = null;
tim@335: 
tim@335:     /**
tim@335:      * Constructor
tim@335:      */
tim@335:     public StateFactory() {
tim@335:         super();
tim@335:     }
tim@335: 
ingo@796:     /**
ingo@796:      * Return the instance of this class.
ingo@796:      *
ingo@796:      * @return
ingo@796:      */
tim@335:     public static StateFactory getInstance() {
tim@335:         if (instance == null) {
tim@335:             instance = new StateFactory();
tim@335:         }
tim@335:         return instance;
tim@335:     }
tim@335: 
ingo@796:     /**
ingo@796:      * This method creates a new state with help of the information in <i>
ingo@796:      * configuration</i> and calls its setup method after creation.
ingo@796:      *
ingo@796:      * @param configuration
ingo@796:      * @return the new state.
ingo@796:      */
tim@335:     public State createState(Node configuration) {
tim@335:         log.debug("StateFactory.createState");
tim@335:         State state = null;
tim@335:         try {
tim@335:             String classname = ((org.w3c.dom.Element)configuration).getAttribute("state");
tim@335:             state = (State) (Class.forName(classname).newInstance());
tim@335:             state.setup(configuration);
tim@335:         } catch (InstantiationException e) {
tim@335:             log.error(e, e);
tim@335:         } catch (IllegalAccessException e) {
tim@335:             log.error(e, e);
tim@335:         } catch (ClassNotFoundException e) {
tim@335:             log.error(e, e);
tim@335:         }
tim@335:         return state;
tim@335:     }
tim@335: 
tim@335: }
ingo@796: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :