52 lines
2.0 KiB
Java
52 lines
2.0 KiB
Java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// $Id: XPathFunction.java 446598 2006-09-15 12:55:40Z jeremias $
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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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* @version $Revision: 446598 $, $Date: 2006-09-15 05:55:40 -0700 (Fri, 15 Sep 2006) $
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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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