net.sf.saxon.instruct
Class SlotManager

java.lang.Object
  net.sf.saxon.instruct.SlotManager

All Implemented Interfaces:

Serializable

public class SlotManager
extends Object
implements Serializable

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.

See Also:

Serialized Form

Constructor Summary

SlotManager()
The constructor should not be called directly.

Method Summary

int	allocateSlotNumber(int fingerprint) Allocate a slot number for a variable
int	getNumberOfVariables() Get number of variables (size of stack frame)
List	getVariableMap() Get the variable map (simply a list of fingerprints of the variable names).
void	setNumberOfVariables(int numberOfVariables) Set the number of variables

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SlotManager

public SlotManager()

The constructor should not be called directly. A new SlotManager should be obtained using the factory method in the Configuration object.

Method Detail

getNumberOfVariables

public int getNumberOfVariables()

Get number of variables (size of stack frame)

setNumberOfVariables

public void setNumberOfVariables(int numberOfVariables)

Set the number of variables

Parameters:

numberOfVariables -

allocateSlotNumber

public int allocateSlotNumber(int fingerprint)

Allocate a slot number for a variable

getVariableMap

public List getVariableMap()

Get the variable map (simply a list of fingerprints of the variable names). Note that it is possible for several variables to have the same name.