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UnboundFunctionLibrary
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net.sf.saxon.query</FONT>
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Class UnboundFunctionLibrary</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.query.UnboundFunctionLibrary</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>UnboundFunctionLibrary</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 UnboundFunctionLibrary is not a real function library; rather, it is used to keep track of function calls
that cannot yet be bound to a known declared function, but will have to be bound when all user-declared functions
are available.
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html#net.sf.saxon.query.UnboundFunctionLibrary">Serialized Form</A></DL>
<HR>
<P>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<TD><CODE><B><A HREF="../../../../net/sf/saxon/query/UnboundFunctionLibrary.html#UnboundFunctionLibrary()">UnboundFunctionLibrary</A></B>()</CODE>
<BR>
Create an XQueryFunctionLibrary</TD>
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<B>Method Summary</B></FONT></TH>
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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/query/UnboundFunctionLibrary.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>[] arguments,
<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>
Identify a (namespace-prefixed) function appearing in the expression.</TD>
</TR>
<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/query/UnboundFunctionLibrary.html#bindUnboundFunctionCalls(net.sf.saxon.query.XQueryFunctionBinder, net.sf.saxon.Configuration)">bindUnboundFunctionCalls</A></B>(<A HREF="../../../../net/sf/saxon/query/XQueryFunctionBinder.html" title="interface in net.sf.saxon.query">XQueryFunctionBinder</A> lib,
<A HREF="../../../../net/sf/saxon/Configuration.html" title="class in net.sf.saxon">Configuration</A> config)</CODE>
<BR>
Bind function calls that could not be bound when first encountered.</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/query/UnboundFunctionLibrary.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/query/UnboundFunctionLibrary.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.</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>
</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>
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<A NAME="UnboundFunctionLibrary()"><!-- --></A><H3>
UnboundFunctionLibrary</H3>
<PRE>
public <B>UnboundFunctionLibrary</B>()</PRE>
<DL>
<DD>Create an XQueryFunctionLibrary
<P>
</DL>
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<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. This supports
the function-available() function in XSLT. Since this library is used only in XQuery,
and contains no real functions, we always return false
<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 name of the function required<DD><CODE>arity</CODE> - The number of arguments. This is set to -1 in the case of the single-argument
<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>[] arguments,
<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>Identify a (namespace-prefixed) function appearing in the expression. This
method is called by the XQuery parser to resolve function calls found within
the query.
<p>Note that a function call may appear earlier in the query than the definition
of the function to which it is bound. Unlike XSLT, we cannot search forwards to
find the function definition. Binding of function calls is therefore a two-stage
process; at the time the function call is parsed, we simply register it as
pending; subsequently at the end of query parsing all the pending function
calls are resolved. Another consequence of this is that we cannot tell at the time
a function call is parsed whether it is a call to an internal (XSLT or XQuery)
function or to an extension function written in Java.
<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 QName of the function being called<DD><CODE>arguments</CODE> - The expressions supplied statically in arguments to the function call.
The length of this array represents the arity of the function. The intention is
that the static type of the arguments (obtainable via getItemType() and getCardinality()) may
be used as part of the binding algorithm. In some cases it may be possible for the function
to be pre-evaluated at compile time, for example if these expressions are all constant values.
<p>
The conventions of the XPath language demand that the results of a function depend only on the
values of the expressions supplied as arguments, and not on the form of those expressions. For
example, the result of f(4) is expected to be the same as f(2+2). The actual expression is supplied
here to enable the binding mechanism to select the most efficient possible implementation (including
compile-time pre-evaluation where appropriate).<DD><CODE>env</CODE> - The static context of the function call<DD><CODE>container</CODE> - The container for the newly created Expression
<DT><B>Returns:</B><DD>an Expression representing the function call. This will normally be
a FunctionCall, but it may be rewritten as some other expression.
<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 the function call is invalid, either because it is
an unprefixed call to a non-system function, or because it is calling a system
function that is available in XSLT only. A prefixed function call that cannot
be recognized at this stage is assumed to be a forwards reference, and is bound
later when bindUnboundFunctionCalls() is called.</DL>
</DD>
</DL>
<HR>
<A NAME="bindUnboundFunctionCalls(net.sf.saxon.query.XQueryFunctionBinder, net.sf.saxon.Configuration)"><!-- --></A><H3>
bindUnboundFunctionCalls</H3>
<PRE>
public void <B>bindUnboundFunctionCalls</B>(<A HREF="../../../../net/sf/saxon/query/XQueryFunctionBinder.html" title="interface in net.sf.saxon.query">XQueryFunctionBinder</A> lib,
<A HREF="../../../../net/sf/saxon/Configuration.html" title="class in net.sf.saxon">Configuration</A> config)
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Bind function calls that could not be bound when first encountered. These
will either be forwards references to functions declared later in the query,
or errors. This method is for internal use.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>lib</CODE> - A library containing all the XQuery functions that have been declared;
the method searches this library for this missing function call<DD><CODE>config</CODE> - The Saxon configuration
<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 call refers to a function that has
not been declared</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>
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