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ForEachGroupFunction
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com.saxonica.functions.extfn</FONT>
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Class ForEachGroupFunction</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 "><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html" title="class in net.sf.saxon.lib">net.sf.saxon.lib.ExtensionFunctionDefinition</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.saxonica.functions.extfn.ForEachGroupFunction</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></DD>
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<DT><PRE>public class <B>ForEachGroupFunction</B><DT>extends <A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html" title="class in net.sf.saxon.lib">ExtensionFunctionDefinition</A></DL>
</PRE>
<P>
This class implements the extension function saxon:for-each-group(). This is a higher order
function that provides grouping capability. Its effect is similar to the XSLT 2.0 for-each-group
instruction, but it works also in XQuery. The first argument is the population to be grouped;
the second argument is a function that calculates the grouping key; the third argument is the action
to be performed on each group: it gets the members of the group as its argument.
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html#com.saxonica.functions.extfn.ForEachGroupFunction">Serialized Form</A></DL>
<HR>
<P>
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<TD><CODE><B><A HREF="../../../../com/saxonica/functions/extfn/ForEachGroupFunction.html#ForEachGroupFunction()">ForEachGroupFunction</A></B>()</CODE>
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<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="../../../../com/saxonica/functions/extfn/ForEachGroupFunction.html#getArgumentTypes()">getArgumentTypes</A></B>()</CODE>
<BR>
Get the required types for the arguments of this function, counting from zero</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/om/StructuredQName.html" title="class in net.sf.saxon.om">StructuredQName</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/functions/extfn/ForEachGroupFunction.html#getFunctionQName()">getFunctionQName</A></B>()</CODE>
<BR>
Get the function name, as a QName</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/functions/extfn/ForEachGroupFunction.html#getMaximumNumberOfArguments()">getMaximumNumberOfArguments</A></B>()</CODE>
<BR>
Get the maximum number of arguments allowed by the function</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/functions/extfn/ForEachGroupFunction.html#getMinimumNumberOfArguments()">getMinimumNumberOfArguments</A></B>()</CODE>
<BR>
Get the minimum number of arguments required by the function</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="../../../../com/saxonica/functions/extfn/ForEachGroupFunction.html#getResultType(net.sf.saxon.value.SequenceType[])">getResultType</A></B>(<A HREF="../../../../net/sf/saxon/value/SequenceType.html" title="class in net.sf.saxon.value">SequenceType</A>[] suppliedArgumentTypes)</CODE>
<BR>
Get the type of the result of the function</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/lib/ExtensionFunctionCall.html" title="class in net.sf.saxon.lib">ExtensionFunctionCall</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/functions/extfn/ForEachGroupFunction.html#makeCallExpression()">makeCallExpression</A></B>()</CODE>
<BR>
Create a call on this function.</TD>
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<TH ALIGN="left"><B>Methods inherited from class net.sf.saxon.lib.<A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html" title="class in net.sf.saxon.lib">ExtensionFunctionDefinition</A></B></TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html#dependsOnFocus()">dependsOnFocus</A>, <A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html#hasSideEffects()">hasSideEffects</A>, <A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html#trustResultType()">trustResultType</A></CODE></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="ForEachGroupFunction()"><!-- --></A><H3>
ForEachGroupFunction</H3>
<PRE>
public <B>ForEachGroupFunction</B>()</PRE>
<DL>
</DL>
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<A NAME="getFunctionQName()"><!-- --></A><H3>
getFunctionQName</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/om/StructuredQName.html" title="class in net.sf.saxon.om">StructuredQName</A> <B>getFunctionQName</B>()</PRE>
<DL>
<DD>Get the function name, as a QName
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html#getFunctionQName()">getFunctionQName</A></CODE> in class <CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html" title="class in net.sf.saxon.lib">ExtensionFunctionDefinition</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the QName of the function</DL>
</DD>
</DL>
<HR>
<A NAME="getMinimumNumberOfArguments()"><!-- --></A><H3>
getMinimumNumberOfArguments</H3>
<PRE>
public int <B>getMinimumNumberOfArguments</B>()</PRE>
<DL>
<DD>Get the minimum number of arguments required by the function
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html#getMinimumNumberOfArguments()">getMinimumNumberOfArguments</A></CODE> in class <CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html" title="class in net.sf.saxon.lib">ExtensionFunctionDefinition</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the minimum number of arguments that must be supplied in a call to this function</DL>
</DD>
</DL>
<HR>
<A NAME="getMaximumNumberOfArguments()"><!-- --></A><H3>
getMaximumNumberOfArguments</H3>
<PRE>
public int <B>getMaximumNumberOfArguments</B>()</PRE>
<DL>
<DD>Get the maximum number of arguments allowed by the function
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html#getMaximumNumberOfArguments()">getMaximumNumberOfArguments</A></CODE> in class <CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html" title="class in net.sf.saxon.lib">ExtensionFunctionDefinition</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the maximum number of arguments that may be supplied in a call to this function</DL>
</DD>
</DL>
<HR>
<A NAME="getArgumentTypes()"><!-- --></A><H3>
getArgumentTypes</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/value/SequenceType.html" title="class in net.sf.saxon.value">SequenceType</A>[] <B>getArgumentTypes</B>()</PRE>
<DL>
<DD>Get the required types for the arguments of this function, counting from zero
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html#getArgumentTypes()">getArgumentTypes</A></CODE> in class <CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html" title="class in net.sf.saxon.lib">ExtensionFunctionDefinition</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the required types of the argument, as defined by the function signature. Normally
this should be an array of size <A HREF="../../../../com/saxonica/functions/extfn/ForEachGroupFunction.html#getMaximumNumberOfArguments()"><CODE>getMaximumNumberOfArguments()</CODE></A>; however for functions
that allow a variable number of arguments, the array can be smaller than this, with the last
entry in the array providing the required type for all the remaining arguments.</DL>
</DD>
</DL>
<HR>
<A NAME="getResultType(net.sf.saxon.value.SequenceType[])"><!-- --></A><H3>
getResultType</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/value/SequenceType.html" title="class in net.sf.saxon.value">SequenceType</A> <B>getResultType</B>(<A HREF="../../../../net/sf/saxon/value/SequenceType.html" title="class in net.sf.saxon.value">SequenceType</A>[] suppliedArgumentTypes)</PRE>
<DL>
<DD>Get the type of the result of the function
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html#getResultType(net.sf.saxon.value.SequenceType[])">getResultType</A></CODE> in class <CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html" title="class in net.sf.saxon.lib">ExtensionFunctionDefinition</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>suppliedArgumentTypes</CODE> - the static types of the arguments to the function.
This is provided so that a more precise result type can be returned in the common
case where the type of the result depends on the type of the first argument. The value
will be null if the function call has no arguments.
<DT><B>Returns:</B><DD>the return type of the function, as defined by its function signature</DL>
</DD>
</DL>
<HR>
<A NAME="makeCallExpression()"><!-- --></A><H3>
makeCallExpression</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionCall.html" title="class in net.sf.saxon.lib">ExtensionFunctionCall</A> <B>makeCallExpression</B>()</PRE>
<DL>
<DD>Create a call on this function. This method is called by the compiler when it identifies
a function call that calls this function.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html#makeCallExpression()">makeCallExpression</A></CODE> in class <CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html" title="class in net.sf.saxon.lib">ExtensionFunctionDefinition</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an expression representing a call of this extension function</DL>
</DD>
</DL>
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