001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements. See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership. The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the  "License");
007     * you may not use this file except in compliance with the License.
008     * You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    /*
019     * $Id: ExtensionsProvider.java 468655 2006-10-28 07:12:06Z minchau $
020     */
021    package org.apache.xpath;
022    
023    import java.util.Vector;
024    
025    import org.apache.xpath.functions.FuncExtFunction;
026    
027    /**
028     * Interface that XPath objects can call to obtain access to an 
029     * ExtensionsTable.
030     * 
031     */
032    public interface ExtensionsProvider
033    {
034      /**
035       * Is the extension function available?
036       */
037      
038      public boolean functionAvailable(String ns, String funcName)
039              throws javax.xml.transform.TransformerException;
040      
041      /**
042       * Is the extension element available?
043       */
044      public boolean elementAvailable(String ns, String elemName)
045              throws javax.xml.transform.TransformerException;
046       
047      /**
048       * Execute the extension function.
049       */
050      public Object extFunction(String ns, String funcName, 
051                                Vector argVec, Object methodKey)
052                throws javax.xml.transform.TransformerException;
053    
054      /**
055       * Execute the extension function.
056       */
057      public Object extFunction(FuncExtFunction extFunction, 
058                                Vector argVec)
059                throws javax.xml.transform.TransformerException;
060    }