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SlotManager
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net.sf.saxon.expr.instruct</FONT>
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Class SlotManager</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.expr.instruct.SlotManager</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>SlotManager</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="http://download.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</A></DL>
</PRE>
<P>
A SlotManager supports functions, templates, etc: specifically, any executable code that
requires a stack frame containing local variables. In XSLT a SlotManager underpins any
top-level element that can contain local variable declarations,
specifically, a top-level xsl:template, xsl:variable, xsl:param, or xsl:function element
or an xsl:attribute-set element or xsl:key element. In XQuery it underpins functions and
global variables. The purpose of the SlotManager is to allocate slot numbers to variables
in the stack, and to record how many slots are needed. A Debugger may define a subclass
with additional functionality.
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../serialized-form.html#net.sf.saxon.expr.instruct.SlotManager">Serialized Form</A></DL>
<HR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../../../net/sf/saxon/expr/instruct/SlotManager.html" title="class in net.sf.saxon.expr.instruct">SlotManager</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/SlotManager.html#EMPTY">EMPTY</A></B></CODE>
<BR>
An empty SlotManager</TD>
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<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/SlotManager.html#SlotManager()">SlotManager</A></B>()</CODE>
<BR>
The constructor should not be called directly.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/SlotManager.html#SlotManager(int)">SlotManager</A></B>(int n)</CODE>
<BR>
Create a SlotManager with a given number of slots</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/SlotManager.html#allocateSlotNumber(net.sf.saxon.om.StructuredQName)">allocateSlotNumber</A></B>(<A HREF="../../../../../net/sf/saxon/om/StructuredQName.html" title="class in net.sf.saxon.om">StructuredQName</A> qName)</CODE>
<BR>
Allocate a slot number for a variable</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="../../../../../net/sf/saxon/expr/instruct/SlotManager.html#getNumberOfVariables()">getNumberOfVariables</A></B>()</CODE>
<BR>
Get number of variables (size of stack frame)</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/List.html?is-external=true" title="class or interface in java.util">List</A><<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/expr/instruct/SlotManager.html#getVariableMap()">getVariableMap</A></B>()</CODE>
<BR>
Get the variable map (simply a list of variable names as structured QNames).</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/expr/instruct/SlotManager.html#setNumberOfVariables(int)">setNumberOfVariables</A></B>(int numberOfVariables)</CODE>
<BR>
Set the number of variables</TD>
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<A NAME="EMPTY"><!-- --></A><H3>
EMPTY</H3>
<PRE>
public static <A HREF="../../../../../net/sf/saxon/expr/instruct/SlotManager.html" title="class in net.sf.saxon.expr.instruct">SlotManager</A> <B>EMPTY</B></PRE>
<DL>
<DD>An empty SlotManager
<P>
<DL>
</DL>
</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="SlotManager()"><!-- --></A><H3>
SlotManager</H3>
<PRE>
public <B>SlotManager</B>()</PRE>
<DL>
<DD>The constructor should not be called directly. A new SlotManager should be obtained using
the factory method <A HREF="../../../../../net/sf/saxon/Configuration.html#makeSlotManager()"><CODE>Configuration.makeSlotManager()</CODE></A>.
<P>
</DL>
<HR>
<A NAME="SlotManager(int)"><!-- --></A><H3>
SlotManager</H3>
<PRE>
public <B>SlotManager</B>(int n)</PRE>
<DL>
<DD>Create a SlotManager with a given number of slots
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the number of slots</DL>
</DL>
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<A NAME="getNumberOfVariables()"><!-- --></A><H3>
getNumberOfVariables</H3>
<PRE>
public int <B>getNumberOfVariables</B>()</PRE>
<DL>
<DD>Get number of variables (size of stack frame)
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the number of slots for variables</DL>
</DD>
</DL>
<HR>
<A NAME="setNumberOfVariables(int)"><!-- --></A><H3>
setNumberOfVariables</H3>
<PRE>
public void <B>setNumberOfVariables</B>(int numberOfVariables)</PRE>
<DL>
<DD>Set the number of variables
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>numberOfVariables</CODE> - the space to be allocated for variables</DL>
</DD>
</DL>
<HR>
<A NAME="allocateSlotNumber(net.sf.saxon.om.StructuredQName)"><!-- --></A><H3>
allocateSlotNumber</H3>
<PRE>
public int <B>allocateSlotNumber</B>(<A HREF="../../../../../net/sf/saxon/om/StructuredQName.html" title="class in net.sf.saxon.om">StructuredQName</A> qName)</PRE>
<DL>
<DD>Allocate a slot number for a variable
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>qName</CODE> - the name of the variable
<DT><B>Returns:</B><DD>the allocated slot number (the next one available)</DL>
</DD>
</DL>
<HR>
<A NAME="getVariableMap()"><!-- --></A><H3>
getVariableMap</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A><<A HREF="../../../../../net/sf/saxon/om/StructuredQName.html" title="class in net.sf.saxon.om">StructuredQName</A>> <B>getVariableMap</B>()</PRE>
<DL>
<DD>Get the variable map (simply a list of variable names as structured QNames). Note that it
is possible for several variables to have the same name.
<p><b>Changed in Saxon 9.0 to return a list of StructuredQName values rather than integers</b></p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the list of variable names for this stack frame</DL>
</DD>
</DL>
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