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57 lines
1.3 KiB
57 lines
1.3 KiB
/*
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* Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.xml.xpath;
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import java.util.List;
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/**
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* <p><code>XPathFunction</code> provides access to XPath functions.</p>
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*
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* <p>Functions are identified by QName and arity in XPath.</p>
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*
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* @author <a href="mailto:Norman.Walsh@Sun.com">Norman Walsh</a>
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* @author <a href="mailto:Jeff.Suttor@Sun.com">Jeff Suttor</a>
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* @since 1.5
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*/
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public interface XPathFunction {
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/**
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* <p>Evaluate the function with the specified arguments.</p>
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*
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* <p>To the greatest extent possible, side-effects should be avoided in the
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* definition of extension functions. The implementation evaluating an
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* XPath expression is under no obligation to call extension functions in
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* any particular order or any particular number of times.</p>
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*
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* @param args The arguments, <code>null</code> is a valid value.
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*
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* @return The result of evaluating the <code>XPath</code> function as an <code>Object</code>.
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*
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* @throws XPathFunctionException If <code>args</code> cannot be evaluated with this <code>XPath</code> function.
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*/
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public Object evaluate(List args)
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throws XPathFunctionException;
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}
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