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 * 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
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 *     http://www.apache.org/licenses/LICENSE-2.0
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// $Id: XPathFunction.java 446598 2006-09-15 12:55:40Z jeremias $

package javax.xml.xpath;

import java.util.List;

/**
 * 

XPathFunction provides access to XPath functions.

* *

Functions are identified by QName and arity in XPath.

* * @author Norman Walsh * @author Jeff Suttor * @version $Revision: 446598 $, $Date: 2006-09-15 08:55:40 -0400 (Fri, 15 Sep 2006) $ * @since 1.5 */ public interface XPathFunction { /** *

Evaluate the function with the specified arguments.

* *

To the greatest extent possible, side-effects should be avoided in the * definition of extension functions. The implementation evaluating an * XPath expression is under no obligation to call extension functions in * any particular order or any particular number of times.

* * @param args The arguments, null is a valid value. * * @return The result of evaluating the XPath function as an Object. * * @throws XPathFunctionException If args cannot be evaluated with this XPath function. */ public Object evaluate(List args) throws XPathFunctionException; }




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