Get all prefixes defined, up to the root, for a namespace URI. : Namespace « XML « Java Tutorial





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 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
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 * 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
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 * Unless required by applicable law or agreed to in writing,
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 */

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";
  /**
   * Get all prefixes defined, up to the root, for a namespace URI.
   * 
   * @param element
   * @param namespaceUri
   * @param prefixes
   */
  public static void getPrefixesRecursive(Element element, String namespaceUri, List<String> prefixes) {
      getPrefixes(element, namespaceUri, prefixes);
      Node parent = element.getParentNode();
      if (parent instanceof Element) {
          getPrefixesRecursive((Element)parent, namespaceUri, prefixes);
      }
  }
  /**
   * Get all prefixes defined on this element for the specified namespace.
   * 
   * @param element
   * @param namespaceUri
   * @param prefixes
   */
  public static void getPrefixes(Element element, String namespaceUri, List<String> prefixes) {
      NamedNodeMap atts = element.getAttributes();
      for (int i = 0; i < atts.getLength(); i++) {
          Node node = atts.item(i);
          String name = node.getNodeName();
          if (namespaceUri.equals(node.getNodeValue())
              && (name != null && (XMLNAMESPACE.equals(name) || name.startsWith(XMLNAMESPACE + ":")))) {
              prefixes.add(node.getPrefix());
          }
      }
  }
}










33.26.Namespace
33.26.1.Access elements from document with namespaces
33.26.2.Handling namespaces during parsing
33.26.3.Create Namespace
33.26.4.Get Attribute by QName
33.26.5.Set a namespace/prefix on an element if it is not set already.
33.26.6.Get all prefixes defined on this element for the specified namespace.
33.26.7.Get all prefixes defined, up to the root, for a namespace URI.
33.26.8.Creates a QName instance from the given namespace context for the given qualifiedName
33.26.9.Starting from a node, find the namespace declaration for a prefix.
33.26.10.Returns the first element that has the specified local name.
33.26.11.Checks whether the supplied String is an NCName (Namespace Classified Name)
33.26.12.Finds and returns the first child node with the given qualified name.
33.26.13.Finds and returns the last child node with the given qualified name.
33.26.14.Finds and returns the next sibling node with the given qualified name.