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ExecutableFunctionLibrary
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net.sf.saxon.functions</FONT>
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Class ExecutableFunctionLibrary</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.functions.ExecutableFunctionLibrary</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>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>ExecutableFunctionLibrary</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>
An ExecutableFunctionLibrary is a function library that contains definitions of functions for use at
run-time. Normally functions are bound at compile-time; however there are various situations in which
the information is needed dynamically, for example (a) to support the XSLT function-available() call
(in the pathological case where the argument is not known statically), (b) to allow functions to be
called from saxon:evaluate(), (c) to allow functions to be called from a debugging breakpoint.
The objects actually held in the ExecutableFunctionLibrary are UserFunctionCall objects that have been
prepared at compile time. These are function calls that do full dynamic type checking: that is, they
are prepared on the basis that the static types of the arguments are all "item()*", meaning that full
type checking is needed at run-time.
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html#net.sf.saxon.functions.ExecutableFunctionLibrary">Serialized Form</A></DL>
<HR>
<P>
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<TD><CODE><B><A HREF="../../../../net/sf/saxon/functions/ExecutableFunctionLibrary.html#ExecutableFunctionLibrary(net.sf.saxon.Configuration)">ExecutableFunctionLibrary</A></B>(<A HREF="../../../../net/sf/saxon/Configuration.html" title="class in net.sf.saxon">Configuration</A> config)</CODE>
<BR>
Create the ExecutableFunctionLibrary</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/functions/ExecutableFunctionLibrary.html#addFunction(net.sf.saxon.expr.instruct.UserFunction)">addFunction</A></B>(<A HREF="../../../../net/sf/saxon/expr/instruct/UserFunction.html" title="class in net.sf.saxon.expr.instruct">UserFunction</A> fn)</CODE>
<BR>
Register a function with the function library</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<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/functions/ExecutableFunctionLibrary.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/functions/ExecutableFunctionLibrary.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>
</TR>
<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/functions/ExecutableFunctionLibrary.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>
</TR>
<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/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A><<A HREF="../../../../net/sf/saxon/expr/instruct/UserFunction.html" title="class in net.sf.saxon.expr.instruct">UserFunction</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/functions/ExecutableFunctionLibrary.html#iterateFunctions()">iterateFunctions</A></B>()</CODE>
<BR>
Iterate over all the functions defined in this function library.</TD>
</TR>
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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>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
</TR>
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<P>
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<A NAME="ExecutableFunctionLibrary(net.sf.saxon.Configuration)"><!-- --></A><H3>
ExecutableFunctionLibrary</H3>
<PRE>
public <B>ExecutableFunctionLibrary</B>(<A HREF="../../../../net/sf/saxon/Configuration.html" title="class in net.sf.saxon">Configuration</A> config)</PRE>
<DL>
<DD>Create the ExecutableFunctionLibrary
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>config</CODE> - the Saxon configuration</DL>
</DL>
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<A NAME="addFunction(net.sf.saxon.expr.instruct.UserFunction)"><!-- --></A><H3>
addFunction</H3>
<PRE>
public void <B>addFunction</B>(<A HREF="../../../../net/sf/saxon/expr/instruct/UserFunction.html" title="class in net.sf.saxon.expr.instruct">UserFunction</A> fn)</PRE>
<DL>
<DD>Register a function with the function library
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>fn</CODE> - the function to be registered</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.
<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> - The name of the function to be called<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> - the static evaluation context<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 and arity.
<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; or if this function library "owns" the namespace containing
the function call, but no function was found.</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>
</DL>
<HR>
<A NAME="iterateFunctions()"><!-- --></A><H3>
iterateFunctions</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A><<A HREF="../../../../net/sf/saxon/expr/instruct/UserFunction.html" title="class in net.sf.saxon.expr.instruct">UserFunction</A>> <B>iterateFunctions</B>()</PRE>
<DL>
<DD>Iterate over all the functions defined in this function library. The objects
returned by the iterator are of class <A HREF="../../../../net/sf/saxon/expr/instruct/UserFunction.html" title="class in net.sf.saxon.expr.instruct"><CODE>UserFunction</CODE></A>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an iterator delivering the <A HREF="../../../../net/sf/saxon/expr/instruct/UserFunction.html" title="class in net.sf.saxon.expr.instruct"><CODE>UserFunction</CODE></A> objects representing
the user-defined functions in a stylesheet or query</DL>
</DD>
</DL>
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