| /* |
| * 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. |
| */ |
| // $Id: JAXPPrefixResolver.java 468655 2006-10-28 07:12:06Z minchau $ |
| |
| package org.apache.xpath.jaxp; |
| |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NamedNodeMap; |
| import org.apache.xml.utils.PrefixResolver; |
| |
| import javax.xml.namespace.NamespaceContext; |
| |
| /** |
| * <meta name="usage" content="general"/> |
| * This class implements a Default PrefixResolver which |
| * can be used to perform prefix-to-namespace lookup |
| * for the XPath object. |
| * This class delegates the resolution to the passed NamespaceContext |
| */ |
| public class JAXPPrefixResolver implements PrefixResolver |
| { |
| |
| private NamespaceContext namespaceContext; |
| |
| |
| public JAXPPrefixResolver ( NamespaceContext nsContext ) { |
| this.namespaceContext = nsContext; |
| } |
| |
| |
| public String getNamespaceForPrefix( String prefix ) { |
| return namespaceContext.getNamespaceURI( prefix ); |
| } |
| |
| /** |
| * Return the base identifier. |
| * |
| * @return null |
| */ |
| public String getBaseIdentifier() { |
| return null; |
| } |
| |
| /** |
| * @see PrefixResolver#handlesNullPrefixes() |
| */ |
| public boolean handlesNullPrefixes() { |
| return false; |
| } |
| |
| |
| /** |
| * The URI for the XML namespace. |
| * (Duplicate of that found in org.apache.xpath.XPathContext). |
| */ |
| |
| public static final String S_XMLNAMESPACEURI = |
| "http://www.w3.org/XML/1998/namespace"; |
| |
| |
| /** |
| * Given a prefix and a Context Node, get the corresponding namespace. |
| * Warning: This will not work correctly if namespaceContext |
| * is an attribute node. |
| * @param prefix Prefix to resolve. |
| * @param namespaceContext Node from which to start searching for a |
| * xmlns attribute that binds a prefix to a namespace. |
| * @return Namespace that prefix resolves to, or null if prefix |
| * is not bound. |
| */ |
| public String getNamespaceForPrefix(String prefix, |
| org.w3c.dom.Node namespaceContext) { |
| Node parent = namespaceContext; |
| String namespace = null; |
| |
| if (prefix.equals("xml")) { |
| namespace = S_XMLNAMESPACEURI; |
| } else { |
| int type; |
| |
| while ((null != parent) && (null == namespace) |
| && (((type = parent.getNodeType()) == Node.ELEMENT_NODE) |
| || (type == Node.ENTITY_REFERENCE_NODE))) { |
| |
| if (type == Node.ELEMENT_NODE) { |
| NamedNodeMap nnm = parent.getAttributes(); |
| |
| for (int i = 0; i < nnm.getLength(); i++) { |
| Node attr = nnm.item(i); |
| String aname = attr.getNodeName(); |
| boolean isPrefix = aname.startsWith("xmlns:"); |
| |
| if (isPrefix || aname.equals("xmlns")) { |
| int index = aname.indexOf(':'); |
| String p =isPrefix ?aname.substring(index + 1) :""; |
| |
| if (p.equals(prefix)) { |
| namespace = attr.getNodeValue(); |
| break; |
| } |
| } |
| } |
| } |
| |
| parent = parent.getParentNode(); |
| } |
| } |
| return namespace; |
| } |
| |
| } |
| |