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| javax.xml.xpath</FONT>
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| Interface XPathFunctionResolver</H2>
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| <DL>
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| <DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../org/apache/xalan/extensions/XPathFunctionResolverImpl.html">XPathFunctionResolverImpl</A></DD>
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| <DT>public interface <B>XPathFunctionResolver</B></DL>
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| <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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| <DL>
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| <DT><B>Since: </B><DD>1.5</DD>
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| <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">XPathFunction</A></CODE></FONT></TD>
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| <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">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>
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| resolveFunction</H3>
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| <PRE>
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| public <A HREF="../../../javax/xml/xpath/XPathFunction.html">XPathFunction</A> <B>resolveFunction</B>(<A HREF="../../../javax/xml/namespace/QName.html">QName</A> functionName, |
| int arity)</PRE>
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| <DL>
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| <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><DD><DL>
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| <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>java.lang.NullPointerException - If <code>functionName</code> or <code>arity</code> is <code>null</code>.</DL>
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