code: /*
   * 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.
   */
  /*
   * $Id$
   */
  package org.apache.xpath;
  
  import java.util.Vector;
  
  import org.apache.xpath.functions.FuncExtFunction;
  
  /**
   * Interface that XPath objects can call to obtain access to an 
   * ExtensionsTable.
   * 
   */
  public interface ExtensionsProvider
  {
    /**
     * Is the extension function available?
     */
    
    public boolean functionAvailable(String ns, String funcName)
            throws javax.xml.transform.TransformerException;
    
    /**
     * Is the extension element available?
     */
    public boolean elementAvailable(String ns, String elemName)
            throws javax.xml.transform.TransformerException;
     
    /**
     * Execute the extension function.
     */
    public Object extFunction(String ns, String funcName, 
                              Vector argVec, Object methodKey)
              throws javax.xml.transform.TransformerException;
  
    /**
     * Execute the extension function.
     */
    public Object extFunction(FuncExtFunction extFunction, 
                              Vector argVec)
              throws javax.xml.transform.TransformerException;
  }
  