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59 lines
1.6 KiB
59 lines
1.6 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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package javax.xml.xpath;
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import javax.xml.namespace.QName;
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/**
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* <p><code>XPathVariableResolver</code> provides access to the set of user defined XPath variables.</p>
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*
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* <p>The <code>XPathVariableResolver</code> and the XPath evaluator must adhere to a contract that
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* cannot be directly enforced by the API. Although variables may be mutable,
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* that is, an application may wish to evaluate the same XPath expression more
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* than once with different variable values, in the course of evaluating any
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* single XPath expression, a variable's value <strong><em>must</em></strong>
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* not change.</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 XPathVariableResolver {
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/**
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* <p>Find a variable in the set of available variables.</p>
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*
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* <p>If <code>variableName</code> is <code>null</code>, then a <code>NullPointerException</code> is thrown.</p>
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*
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* @param variableName The <code>QName</code> of the variable name.
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*
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* @return The variables value, or <code>null</code> if no variable named <code>variableName</code>
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* exists. The value returned must be of a type appropriate for the underlying object model.
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*
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* @throws NullPointerException If <code>variableName</code> is <code>null</code>.
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*/
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public Object resolveVariable(QName variableName);
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}
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