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Co-authored-by: Alan Bateman <alan.bateman@oracle.com> Co-authored-by: Alex Buckley <alex.buckley@oracle.com> Co-authored-by: Erik Joelsson <erik.joelsson@oracle.com> Co-authored-by: Jonathan Gibbons <jonathan.gibbons@oracle.com> Co-authored-by: Karen Kinnear <karen.kinnear@oracle.com> Co-authored-by: Magnus Ihse Bursie <magnus.ihse.bursie@oracle.com> Co-authored-by: Mandy Chung <mandy.chung@oracle.com> Co-authored-by: Mark Reinhold <mark.reinhold@oracle.com> Co-authored-by: Paul Sandoz <paul.sandoz@oracle.com> Reviewed-by: alanb, chegar, ihse, mduigou
58 lines
2.6 KiB
Java
58 lines
2.6 KiB
Java
/*
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* Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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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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