Mercurial > dive4elements > gnv-client
comparison geo-backend/src/main/java/de/intevation/gnv/geobackend/util/XMLUtils.java @ 1121:9d530f913729
Added a helper class to handle xml related stuff.
geo-backend/trunk@1148 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
|---|---|
| date | Thu, 03 Jun 2010 12:35:35 +0000 |
| parents | |
| children | ebeb56428409 |
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| 1120:d387a97807a3 | 1121:9d530f913729 |
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| 1 package de.intevation.gnv.geobackend.util; | |
| 2 | |
| 3 import javax.xml.namespace.NamespaceContext; | |
| 4 import javax.xml.namespace.QName; | |
| 5 | |
| 6 import javax.xml.xpath.XPath; | |
| 7 import javax.xml.xpath.XPathExpressionException; | |
| 8 import javax.xml.xpath.XPathFactory; | |
| 9 | |
| 10 import org.apache.log4j.Logger; | |
| 11 | |
| 12 | |
| 13 /** | |
| 14 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> | |
| 15 */ | |
| 16 public final class XMLUtils { | |
| 17 | |
| 18 private static Logger logger = Logger.getLogger(XMLUtils.class); | |
| 19 | |
| 20 | |
| 21 private XMLUtils() { | |
| 22 } | |
| 23 | |
| 24 | |
| 25 public static Object xpath( | |
| 26 Object root, | |
| 27 String query, | |
| 28 QName returnType, | |
| 29 NamespaceContext namespaceContext | |
| 30 ) { | |
| 31 if (root == null) { | |
| 32 return null; | |
| 33 } | |
| 34 | |
| 35 try { | |
| 36 XPath xpath = newXPath(namespaceContext); | |
| 37 | |
| 38 if (xpath != null) { | |
| 39 return xpath.evaluate(query, root, returnType); | |
| 40 } | |
| 41 } | |
| 42 catch (XPathExpressionException xpee) { | |
| 43 logger.error(xpee.getLocalizedMessage(), xpee); | |
| 44 } | |
| 45 | |
| 46 return null; | |
| 47 } | |
| 48 | |
| 49 | |
| 50 public static XPath newXPath(NamespaceContext namespaceContext) { | |
| 51 XPathFactory factory = XPathFactory.newInstance(); | |
| 52 XPath xpath = factory.newXPath(); | |
| 53 | |
| 54 if (namespaceContext != null) { | |
| 55 xpath.setNamespaceContext(namespaceContext); | |
| 56 } | |
| 57 | |
| 58 return xpath; | |
| 59 } | |
| 60 } | |
| 61 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |