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

package javax.xml.xpath;

import javax.xml.namespace.QName;

/**
 * 

XPathVariableResolver provides access to the set of user defined XPath variables.

* *

The XPathVariableResolver and the XPath evaluator must adhere to a contract that * cannot be directly enforced by the API. Although variables may be mutable, * that is, an application may wish to evaluate the same XPath expression more * than once with different variable values, in the course of evaluating any * single XPath expression, a variable's value must be immutable.

* * @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 XPathVariableResolver { /** *

Find a variable in the set of available variables.

* *

If variableName is null, then a NullPointerException is thrown.

* * @param variableName The QName of the variable name. * * @return The variables value, or null if no variable named variableName * exists. The value returned must be of a type appropriate for the underlying object model. * * @throws NullPointerException If variableName is null. */ public Object resolveVariable(QName variableName); }




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