Mercurial > dive4elements > river
comparison 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> |
|---|---|
| date | Thu, 03 Feb 2011 10:23:30 +0000 |
| parents | |
| children | a228b39494a9 |
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| 105:beb991dc4827 | 106:5864c41219db |
|---|---|
| 1 package de.intevation.flys.artifacts.transitions; | |
| 2 | |
| 3 import javax.xml.xpath.XPathConstants; | |
| 4 | |
| 5 import org.apache.log4j.Logger; | |
| 6 | |
| 7 import org.w3c.dom.Node; | |
| 8 | |
| 9 import de.intevation.artifacts.common.utils.XMLUtils; | |
| 10 | |
| 11 | |
| 12 /** | |
| 13 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> | |
| 14 */ | |
| 15 public class TransitionFactory { | |
| 16 | |
| 17 /** The logger used in this class */ | |
| 18 private static Logger logger = Logger.getLogger(TransitionFactory.class); | |
| 19 | |
| 20 /** The XPath to the classname of the transition */ | |
| 21 public static final String XPATH_TRANSITION = "@transition"; | |
| 22 | |
| 23 /** The XPath to the current state ID */ | |
| 24 public static final String XPATH_CURRENT_STATE = "from/@state"; | |
| 25 | |
| 26 /** The XPath to the target state ID */ | |
| 27 public static final String XPATH_TARGET_STATE = "to/@state"; | |
| 28 | |
| 29 | |
| 30 /** | |
| 31 * Creates a new Transition based on the configured class provided by | |
| 32 * <code>transitionConf</code>. | |
| 33 * | |
| 34 * @param transitionConf The configuration of the transition. | |
| 35 * | |
| 36 * @return a Transition. | |
| 37 */ | |
| 38 public static Transition createTransition(Node transitionConf) { | |
| 39 String clazz = (String) XMLUtils.xpath( | |
| 40 transitionConf, XPATH_TRANSITION, XPathConstants.STRING); | |
| 41 | |
| 42 Transition transition = null; | |
| 43 | |
| 44 try { | |
| 45 transition = (Transition) Class.forName(clazz).newInstance(); | |
| 46 | |
| 47 String from = (String) XMLUtils.xpath( | |
| 48 transitionConf, XPATH_CURRENT_STATE, XPathConstants.STRING); | |
| 49 String to = (String) XMLUtils.xpath( | |
| 50 transitionConf, XPATH_TARGET_STATE, XPathConstants.STRING); | |
| 51 | |
| 52 transition.setFrom(from); | |
| 53 transition.setTo(to); | |
| 54 } | |
| 55 catch (InstantiationException ie) { | |
| 56 logger.error(ie, ie); | |
| 57 } | |
| 58 catch (IllegalAccessException iae) { | |
| 59 logger.error(iae, iae); | |
| 60 } | |
| 61 catch (ClassNotFoundException cnfe) { | |
| 62 logger.error(cnfe, cnfe); | |
| 63 } | |
| 64 | |
| 65 return transition; | |
| 66 } | |
| 67 } | |
| 68 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |