teichmann@5831: package org.dive4elements.river.artifacts.transitions;
ingo@106: 
ingo@106: import javax.xml.xpath.XPathConstants;
ingo@106: 
ingo@106: import org.apache.log4j.Logger;
ingo@106: 
ingo@106: import org.w3c.dom.Node;
ingo@106: 
teichmann@5831: import org.dive4elements.artifactdatabase.transition.Transition;
ingo@107: 
teichmann@5831: import org.dive4elements.artifacts.common.utils.XMLUtils;
ingo@106: 
ingo@106: 
ingo@106: /**
ingo@106:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@106:  */
ingo@106: public class TransitionFactory {
ingo@106: 
ingo@106:     /** The logger used in this class */
ingo@106:     private static Logger logger = Logger.getLogger(TransitionFactory.class);
ingo@106: 
ingo@106:     /** The XPath to the classname of the transition */
ingo@106:     public static final String XPATH_TRANSITION = "@transition";
ingo@106: 
ingo@106:     /** The XPath to the current state ID */
ingo@106:     public static final String XPATH_CURRENT_STATE = "from/@state";
ingo@106: 
ingo@106:     /** The XPath to the target state ID */
ingo@106:     public static final String XPATH_TARGET_STATE = "to/@state";
ingo@106: 
ingo@106: 
ingo@106:     /**
ingo@106:      * Creates a new Transition based on the configured class provided by
ingo@106:      * <code>transitionConf</code>.
ingo@106:      *
ingo@106:      * @param transitionConf The configuration of the transition.
ingo@106:      *
ingo@106:      * @return a Transition.
ingo@106:      */
ingo@106:     public static Transition createTransition(Node transitionConf) {
ingo@106:         String clazz = (String) XMLUtils.xpath(
ingo@106:             transitionConf, XPATH_TRANSITION, XPathConstants.STRING);
ingo@106: 
ingo@106:         Transition transition = null;
ingo@106: 
ingo@106:         try {
ingo@106:             transition = (Transition) Class.forName(clazz).newInstance();
ingo@106: 
ingo@106:             String from = (String) XMLUtils.xpath(
ingo@106:                 transitionConf, XPATH_CURRENT_STATE, XPathConstants.STRING);
ingo@106:             String to = (String) XMLUtils.xpath(
ingo@106:                 transitionConf, XPATH_TARGET_STATE, XPathConstants.STRING);
ingo@106: 
ingo@354:             transition.init(transitionConf);
ingo@106:             transition.setFrom(from);
ingo@106:             transition.setTo(to);
ingo@106:         }
ingo@106:         catch (InstantiationException ie) {
ingo@106:             logger.error(ie, ie);
ingo@106:         }
ingo@106:         catch (IllegalAccessException iae) {
ingo@106:             logger.error(iae, iae);
ingo@106:         }
ingo@106:         catch (ClassNotFoundException cnfe) {
ingo@106:             logger.error(cnfe, cnfe);
ingo@106:         }
ingo@106: 
ingo@106:         return transition;
ingo@106:     }
ingo@106: }
ingo@106: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :