ingo@1127: /*
ingo@1127:  * Copyright (c) 2010 by Intevation GmbH
ingo@1127:  *
ingo@1127:  * This program is free software under the LGPL (>=v2.1)
ingo@1127:  * Read the file LGPL.txt coming with the software for details
ingo@1127:  * or visit http://www.gnu.org/licenses/ if it does not exist.
ingo@1127:  */
ingo@1127: 
ingo@1121: package de.intevation.gnv.geobackend.util;
ingo@1121: 
ingo@1121: import javax.xml.namespace.NamespaceContext;
ingo@1121: import javax.xml.namespace.QName;
ingo@1121: 
ingo@1121: import javax.xml.xpath.XPath;
ingo@1121: import javax.xml.xpath.XPathExpressionException;
ingo@1121: import javax.xml.xpath.XPathFactory;
ingo@1121: 
ingo@1121: import org.apache.log4j.Logger;
ingo@1121: 
ingo@1121: 
ingo@1121: /**
ingo@1121:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@1121:  */
ingo@1121: public final class XMLUtils {
ingo@1121: 
ingo@1121:     private static Logger logger = Logger.getLogger(XMLUtils.class);
ingo@1121: 
ingo@1121: 
ingo@1121:     private XMLUtils() {
ingo@1121:     }
ingo@1121: 
ingo@1121: 
ingo@1121:     public static Object xpath(
ingo@1121:         Object           root,
ingo@1121:         String           query,
ingo@1121:         QName            returnType,
ingo@1121:         NamespaceContext namespaceContext
ingo@1121:     ) {
ingo@1121:         if (root == null) {
ingo@1121:             return null;
ingo@1121:         }
ingo@1121: 
ingo@1121:         try {
ingo@1121:             XPath xpath = newXPath(namespaceContext);
ingo@1121: 
ingo@1121:             if (xpath != null) {
ingo@1121:                 return xpath.evaluate(query, root, returnType);
ingo@1121:             }
ingo@1121:         }
ingo@1121:         catch (XPathExpressionException xpee) {
ingo@1121:             logger.error(xpee.getLocalizedMessage(), xpee);
ingo@1121:         }
ingo@1121: 
ingo@1121:         return null;
ingo@1121:     }
ingo@1121: 
ingo@1121: 
ingo@1121:     public static XPath newXPath(NamespaceContext namespaceContext) {
ingo@1121:         XPathFactory factory = XPathFactory.newInstance();
ingo@1121:         XPath         xpath  = factory.newXPath();
ingo@1121: 
ingo@1121:         if (namespaceContext != null) {
ingo@1121:             xpath.setNamespaceContext(namespaceContext);
ingo@1121:         }
ingo@1121: 
ingo@1121:         return xpath;
ingo@1121:     }
ingo@1121: }
ingo@1121: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :