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   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 1999-2004 The Apache Software Foundation.
   *
   * Licensed 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,v 1.1.2.1 2005/08/01 01:30:18 jeffsuttor Exp $
  
  package jaxp.sun.org.apache.xpath.internal.jaxp;
  
  import org.w3c.dom.Node;
  import org.w3c.dom.NamedNodeMap;
  import jaxp.sun.org.apache.xml.internal.utils.PrefixResolver;
  
  import jaxp.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 com.sun.org.apache.xpath.internal.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;
      }
  
  }
  