Mega Code Archive
Starting from a node, find the namespace declaration for a prefix
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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import java.util.List;
import javax.xml.XMLConstants;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
/**
* Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler.
*
* @author Costin Manolache
*/
public class Utils {
private static final String XMLNAMESPACE = "xmlns";
/**
* Starting from a node, find the namespace declaration for a prefix. for a matching namespace
* declaration.
*
* @param node search up from here to search for namespace definitions
* @param searchPrefix the prefix we are searching for
* @return the namespace if found.
*/
public static String getNamespace(Node node, String searchPrefix) {
Element el;
while (!(node instanceof Element)) {
node = node.getParentNode();
}
el = (Element)node;
NamedNodeMap atts = el.getAttributes();
for (int i = 0; i < atts.getLength(); i++) {
Node currentAttribute = atts.item(i);
String currentLocalName = currentAttribute.getLocalName();
String currentPrefix = currentAttribute.getPrefix();
if (searchPrefix.equals(currentLocalName) && XMLNAMESPACE.equals(currentPrefix)) {
return currentAttribute.getNodeValue();
} else if (isEmpty(searchPrefix) && XMLNAMESPACE.equals(currentLocalName)
&& isEmpty(currentPrefix)) {
return currentAttribute.getNodeValue();
}
}
Node parent = el.getParentNode();
if (parent instanceof Element) {
return getNamespace((Element)parent, searchPrefix);
}
return null;
}
public static boolean isEmpty(String str) {
return str == null || str.length() == 0;
}
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