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ItemAt
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net.sf.saxon.functions</FONT>
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Class ItemAt</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>net.sf.saxon.functions.ItemAt</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>
</DL>
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<DL>
<DT><PRE>public class <B>ItemAt</B><DT>extends <A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html" title="class in net.sf.saxon.lib">ExtensionFunctionDefinition</A></DL>
</PRE>
<P>
Implements the saxon:item-at() function. This is handled specially because it is generated
by the optimizer.
<p>The function takes two arguments: the first is an arbitrary sequence, the second is optional numeric.
The function returns the same result as let $N := NUMBER return SEQUENCE[$N], including cases where the
numeric argument is not a whole number.</p>
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html#net.sf.saxon.functions.ItemAt">Serialized Form</A></DL>
<HR>
<P>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<B>Constructor Summary</B></FONT></TH>
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<TD><CODE><B><A HREF="../../../../net/sf/saxon/functions/ItemAt.html#ItemAt()">ItemAt</A></B>()</CODE>
<BR>
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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="../../../../net/sf/saxon/functions/ItemAt.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="../../../../net/sf/saxon/functions/ItemAt.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="../../../../net/sf/saxon/functions/ItemAt.html#getMaximumNumberOfArguments()">getMaximumNumberOfArguments</A></B>()</CODE>
<BR>
Get the maximum number of arguments allowed by the function</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="../../../../net/sf/saxon/functions/ItemAt.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="../../../../net/sf/saxon/functions/ItemAt.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>
</TR>
<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="../../../../net/sf/saxon/functions/ItemAt.html#makeCallExpression()">makeCallExpression</A></B>()</CODE>
<BR>
Create a call on this function.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/functions/ItemAt.html#trustResultType()">trustResultType</A></B>()</CODE>
<BR>
Ask whether the result actually returned by the function can be trusted,
or whether it should be checked against the declared type.</TD>
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<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>
</TR>
<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></CODE></TD>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<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="ItemAt()"><!-- --></A><H3>
ItemAt</H3>
<PRE>
public <B>ItemAt</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="../../../../net/sf/saxon/functions/ItemAt.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="trustResultType()"><!-- --></A><H3>
trustResultType</H3>
<PRE>
public boolean <B>trustResultType</B>()</PRE>
<DL>
<DD>Ask whether the result actually returned by the function can be trusted,
or whether it should be checked against the declared type.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/sf/saxon/lib/ExtensionFunctionDefinition.html#trustResultType()">trustResultType</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>true if the function implementation warrants that the value it returns will
be an instance of the declared result type. The default value is false, in which case
the result will be checked at run-time to ensure that it conforms to the declared type.
If the value true is returned, but the function returns a value of the wrong type, the
consequences are unpredictable.</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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