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XPathFunctionResolver
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javax.xml.xpath</FONT>
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Interface XPathFunctionResolver</H2>
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<DT>public interface <B>XPathFunctionResolver</B></DL>
<P>
<p><code>XPathFunctionResolver</code> provides access to the set of user defined <code>XPathFunction</code>s.</p>
<p>XPath functions are resolved by name and arity.
The resolver is not needed for XPath built-in functions and the resolver
<strong><em>cannot</em></strong> be used to override those functions.</p>
<p>In particular, the resolver is only called for functions in an another
namespace (functions with an explicit prefix). This means that you cannot
use the <code>XPathFunctionResolver</code> to implement specifications
like <a href="http://www.w3.org/TR/xmldsig-core/">XML-Signature Syntax
and Processing</a> which extend the function library of XPath 1.0 in the
same namespace. This is a consequence of the design of the resolver.</p>
<p>If you wish to implement additional built-in functions, you will have to
extend the underlying implementation directly.</p>
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<DT><B>Since:</B></DT>
<DD>1.5</DD>
<DT><B>See Also:</B><DD><a href="http://www.w3.org/TR/xpath#corelib">XML Path Language (XPath) Version 1.0, Core Function Library</a></DL>
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<CODE> <A HREF="../../../javax/xml/xpath/XPathFunction.html" title="interface in javax.xml.xpath">XPathFunction</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFunctionResolver.html#resolveFunction(javax.xml.namespace.QName, int)">resolveFunction</A></B>(<A HREF="../../../javax/xml/namespace/QName.html" title="class in javax.xml.namespace">QName</A> functionName,
int arity)</CODE>
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Find a function in the set of available functions.</TD>
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<A NAME="resolveFunction(javax.xml.namespace.QName, int)"><!-- --></A><H3>
resolveFunction</H3>
<PRE>
public <A HREF="../../../javax/xml/xpath/XPathFunction.html" title="interface in javax.xml.xpath">XPathFunction</A> <B>resolveFunction</B>(<A HREF="../../../javax/xml/namespace/QName.html" title="class in javax.xml.namespace">QName</A> functionName,
int arity)</PRE>
<DL>
<DD><p>Find a function in the set of available functions.</p>
<p>If <code>functionName</code> or <code>arity</code> is <code>null</code>, then a <code>NullPointerException</code> is thrown.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>functionName</CODE> - The function name.<DD><CODE>arity</CODE> - The number of arguments that the returned function must accept.
<DT><B>Returns:</B><DD>The function or <code>null</code> if no function named <code>functionName</code> with <code>arity</code> arguments exists.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - If <code>functionName</code> or <code>arity</code> is <code>null</code>.</DL>
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