| /* |
| * 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. |
| */ |
| |
| package com.sun.org.apache.xml.internal.resolver.helpers; |
| |
| import org.w3c.dom.*; |
| |
| /** |
| * Static Namespace query methods. |
| * |
| * <p>This class defines a set of static methods that can be called |
| * to analyze the namespace properties of DOM nodes.</p> |
| * |
| * @author Norman Walsh |
| * <a href="mailto:Norman.Walsh@Sun.COM">Norman.Walsh@Sun.COM</a> |
| * |
| */ |
| public class Namespaces { |
| /** |
| * Returns the "prefix" part of a QName or the empty string (not |
| * null) if the name has no prefix. |
| * |
| * @param element The QName of an element. |
| * @return The prefix part of the element name. |
| */ |
| public static String getPrefix(Element element) { |
| String name = element.getTagName(); |
| String prefix = ""; |
| |
| final int indexOfColon = name.indexOf(':'); |
| if (indexOfColon > 0) { |
| prefix = name.substring(0, indexOfColon); |
| } |
| |
| return prefix; |
| } |
| |
| /** |
| * Returns the "localname" part of a QName, which is the whole |
| * name if it has no prefix. |
| * |
| * @param element The QName of an element. |
| * @return The local part of a QName. |
| */ |
| public static String getLocalName(Element element) { |
| String name = element.getTagName(); |
| |
| final int indexOfColon = name.indexOf(':'); |
| if (indexOfColon > 0) { |
| name = name.substring(indexOfColon + 1); |
| } |
| |
| return name; |
| } |
| |
| /** |
| * Returns the namespace URI for the specified prefix at the |
| * specified context node. |
| * |
| * @param node The context node. |
| * @param prefix The prefix. |
| * @return The namespace URI associated with the prefix, or |
| * null if no namespace declaration exists for the prefix. |
| */ |
| public static String getNamespaceURI(Node node, String prefix) { |
| if (node == null || node.getNodeType() != Node.ELEMENT_NODE) { |
| return null; |
| } |
| |
| if (prefix.length() == 0) { |
| if (((Element) node).hasAttribute("xmlns")) { |
| return ((Element) node).getAttribute("xmlns"); |
| } |
| } else { |
| String nsattr = "xmlns:" + prefix; |
| if (((Element) node).hasAttribute(nsattr)) { |
| return ((Element) node).getAttribute(nsattr); |
| } |
| } |
| |
| return getNamespaceURI(node.getParentNode(), prefix); |
| } |
| |
| /** |
| * Returns the namespace URI for the namespace to which the |
| * element belongs. |
| * |
| * @param element The element. |
| * @return The namespace URI associated with the namespace of the |
| * element, or null if no namespace declaration exists for it. |
| */ |
| public static String getNamespaceURI(Element element) { |
| String prefix = getPrefix(element); |
| return getNamespaceURI(element, prefix); |
| } |
| } |