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XPathFunctionLibrary
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net.sf.saxon.xpath</FONT>
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Class XPathFunctionLibrary</H2>
<PRE>
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>net.sf.saxon.xpath.XPathFunctionLibrary</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</A>, <A HREF="../../../../net/sf/saxon/functions/FunctionLibrary.html" title="interface in net.sf.saxon.functions">FunctionLibrary</A></DD>
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<DT><PRE>public class <B>XPathFunctionLibrary</B><DT>extends <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../net/sf/saxon/functions/FunctionLibrary.html" title="interface in net.sf.saxon.functions">FunctionLibrary</A></DL>
</PRE>
<P>
The XPathFunctionLibrary is a FunctionLibrary that supports binding of XPath function
calls to instances of the JAXP XPathFunction interface returned by an XPathFunctionResolver.
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html#net.sf.saxon.xpath.XPathFunctionLibrary">Serialized Form</A></DL>
<HR>
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<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathFunctionLibrary.html#XPathFunctionLibrary()">XPathFunctionLibrary</A></B>()</CODE>
<BR>
Construct a XPathFunctionLibrary</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathFunctionLibrary.html#bind(net.sf.saxon.om.StructuredQName, net.sf.saxon.expr.Expression[], net.sf.saxon.expr.StaticContext, net.sf.saxon.expr.Container)">bind</A></B>(<A HREF="../../../../net/sf/saxon/om/StructuredQName.html" title="class in net.sf.saxon.om">StructuredQName</A> functionName,
<A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>[] staticArgs,
<A HREF="../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A> env,
<A HREF="../../../../net/sf/saxon/expr/Container.html" title="interface in net.sf.saxon.expr">Container</A> container)</CODE>
<BR>
Bind a function, given the URI and local parts of the function name,
and the list of expressions supplied as arguments.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/functions/FunctionLibrary.html" title="interface in net.sf.saxon.functions">FunctionLibrary</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathFunctionLibrary.html#copy()">copy</A></B>()</CODE>
<BR>
This method creates a copy of a FunctionLibrary: if the original FunctionLibrary allows
new functions to be added, then additions to this copy will not affect the original, or
vice versa.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/value/SequenceType.html" title="class in net.sf.saxon.value">SequenceType</A>[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathFunctionLibrary.html#getFunctionSignature(net.sf.saxon.om.StructuredQName, int)">getFunctionSignature</A></B>(<A HREF="../../../../net/sf/saxon/om/StructuredQName.html" title="class in net.sf.saxon.om">StructuredQName</A> functionName,
int arity)</CODE>
<BR>
Test whether a function with a given name and arity is available; if so, return its signature.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathFunctionResolver.html?is-external=true" title="class or interface in javax.xml.xpath">XPathFunctionResolver</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathFunctionLibrary.html#getXPathFunctionResolver()">getXPathFunctionResolver</A></B>()</CODE>
<BR>
Get the resolver</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathFunctionLibrary.html#setXPathFunctionResolver(javax.xml.xpath.XPathFunctionResolver)">setXPathFunctionResolver</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathFunctionResolver.html?is-external=true" title="class or interface in javax.xml.xpath">XPathFunctionResolver</A> resolver)</CODE>
<BR>
Set the resolver</TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
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<A NAME="XPathFunctionLibrary()"><!-- --></A><H3>
XPathFunctionLibrary</H3>
<PRE>
public <B>XPathFunctionLibrary</B>()</PRE>
<DL>
<DD>Construct a XPathFunctionLibrary
<P>
</DL>
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<A NAME="setXPathFunctionResolver(javax.xml.xpath.XPathFunctionResolver)"><!-- --></A><H3>
setXPathFunctionResolver</H3>
<PRE>
public void <B>setXPathFunctionResolver</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathFunctionResolver.html?is-external=true" title="class or interface in javax.xml.xpath">XPathFunctionResolver</A> resolver)</PRE>
<DL>
<DD>Set the resolver
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>resolver</CODE> - The XPathFunctionResolver wrapped by this FunctionLibrary</DL>
</DD>
</DL>
<HR>
<A NAME="getXPathFunctionResolver()"><!-- --></A><H3>
getXPathFunctionResolver</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathFunctionResolver.html?is-external=true" title="class or interface in javax.xml.xpath">XPathFunctionResolver</A> <B>getXPathFunctionResolver</B>()</PRE>
<DL>
<DD>Get the resolver
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the XPathFunctionResolver wrapped by this FunctionLibrary</DL>
</DD>
</DL>
<HR>
<A NAME="getFunctionSignature(net.sf.saxon.om.StructuredQName, int)"><!-- --></A><H3>
getFunctionSignature</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/value/SequenceType.html" title="class in net.sf.saxon.value">SequenceType</A>[] <B>getFunctionSignature</B>(<A HREF="../../../../net/sf/saxon/om/StructuredQName.html" title="class in net.sf.saxon.om">StructuredQName</A> functionName,
int arity)</PRE>
<DL>
<DD>Test whether a function with a given name and arity is available; if so, return its signature.
This supports the function-available() function in XSLT; it is also used to support
higher-order functions introduced in XQuery 1.1. For this function library the method is never
used and therefore returns null.
<p>This method may be called either at compile time
or at run time. If the function library is to be used only in an XQuery or free-standing XPath
environment, this method may throw an UnsupportedOperationException.</p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/functions/FunctionLibrary.html#getFunctionSignature(net.sf.saxon.om.StructuredQName, int)">getFunctionSignature</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/functions/FunctionLibrary.html" title="interface in net.sf.saxon.functions">FunctionLibrary</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>functionName</CODE> - the qualified name of the function being called<DD><CODE>arity</CODE> - The number of arguments. This is set to -1 in the case of the single-argument
function-available() function; in this case the method should return true if there is some
function of this name available for calling.
<DT><B>Returns:</B><DD>if a function of this name and arity is available for calling, then the type signature of the
function, as an array of sequence types in which the zeroth entry represents the return type; or a zero-length
array if the function exists but the signature is not known; or null if the function does not exist</DL>
</DD>
</DL>
<HR>
<A NAME="bind(net.sf.saxon.om.StructuredQName, net.sf.saxon.expr.Expression[], net.sf.saxon.expr.StaticContext, net.sf.saxon.expr.Container)"><!-- --></A><H3>
bind</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>bind</B>(<A HREF="../../../../net/sf/saxon/om/StructuredQName.html" title="class in net.sf.saxon.om">StructuredQName</A> functionName,
<A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>[] staticArgs,
<A HREF="../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A> env,
<A HREF="../../../../net/sf/saxon/expr/Container.html" title="interface in net.sf.saxon.expr">Container</A> container)
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Bind a function, given the URI and local parts of the function name,
and the list of expressions supplied as arguments. This method is called at compile
time.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/functions/FunctionLibrary.html#bind(net.sf.saxon.om.StructuredQName, net.sf.saxon.expr.Expression[], net.sf.saxon.expr.StaticContext, net.sf.saxon.expr.Container)">bind</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/functions/FunctionLibrary.html" title="interface in net.sf.saxon.functions">FunctionLibrary</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>functionName</CODE> - <DD><CODE>staticArgs</CODE> - The expressions supplied statically in the function call. The intention is
that the static type of the arguments (obtainable via getItemType() and getCardinality() may
be used as part of the binding algorithm.<DD><CODE>env</CODE> - <DD><CODE>container</CODE> -
<DT><B>Returns:</B><DD>An object representing the extension function to be called, if one is found;
null if no extension function was found matching the required name, arity, or signature.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if a function is found with the required name and arity, but
the implementation of the function cannot be loaded or used; or if an error occurs
while searching for the function.</DL>
</DD>
</DL>
<HR>
<A NAME="copy()"><!-- --></A><H3>
copy</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/functions/FunctionLibrary.html" title="interface in net.sf.saxon.functions">FunctionLibrary</A> <B>copy</B>()</PRE>
<DL>
<DD>This method creates a copy of a FunctionLibrary: if the original FunctionLibrary allows
new functions to be added, then additions to this copy will not affect the original, or
vice versa.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/functions/FunctionLibrary.html#copy()">copy</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/functions/FunctionLibrary.html" title="interface in net.sf.saxon.functions">FunctionLibrary</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a copy of this function library. This must be an instance of the original class.</DL>
</DD>
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