Mercurial > dive4elements > river
diff flys-artifacts/src/main/java/de/intevation/flys/artifacts/transitions/TransitionFactory.java @ 106:5864c41219db
Initializes a TransitionEngine storing all transitions for each artifact at the application start.
flys-artifacts/trunk@1288 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Thu, 03 Feb 2011 10:23:30 +0000 |
parents | |
children | a228b39494a9 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/transitions/TransitionFactory.java Thu Feb 03 10:23:30 2011 +0000 @@ -0,0 +1,68 @@ +package de.intevation.flys.artifacts.transitions; + +import javax.xml.xpath.XPathConstants; + +import org.apache.log4j.Logger; + +import org.w3c.dom.Node; + +import de.intevation.artifacts.common.utils.XMLUtils; + + +/** + * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> + */ +public class TransitionFactory { + + /** The logger used in this class */ + private static Logger logger = Logger.getLogger(TransitionFactory.class); + + /** The XPath to the classname of the transition */ + public static final String XPATH_TRANSITION = "@transition"; + + /** The XPath to the current state ID */ + public static final String XPATH_CURRENT_STATE = "from/@state"; + + /** The XPath to the target state ID */ + public static final String XPATH_TARGET_STATE = "to/@state"; + + + /** + * Creates a new Transition based on the configured class provided by + * <code>transitionConf</code>. + * + * @param transitionConf The configuration of the transition. + * + * @return a Transition. + */ + public static Transition createTransition(Node transitionConf) { + String clazz = (String) XMLUtils.xpath( + transitionConf, XPATH_TRANSITION, XPathConstants.STRING); + + Transition transition = null; + + try { + transition = (Transition) Class.forName(clazz).newInstance(); + + String from = (String) XMLUtils.xpath( + transitionConf, XPATH_CURRENT_STATE, XPathConstants.STRING); + String to = (String) XMLUtils.xpath( + transitionConf, XPATH_TARGET_STATE, XPathConstants.STRING); + + transition.setFrom(from); + transition.setTo(to); + } + catch (InstantiationException ie) { + logger.error(ie, ie); + } + catch (IllegalAccessException iae) { + logger.error(iae, iae); + } + catch (ClassNotFoundException cnfe) { + logger.error(cnfe, cnfe); + } + + return transition; + } +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :