Package net.sf.saxon.instruct
Class SlotManager
- java.lang.Object
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- net.sf.saxon.instruct.SlotManager
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- All Implemented Interfaces:
java.io.Serializable
public class SlotManager extends java.lang.Object implements java.io.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
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Field Summary
Fields Modifier and Type Field Description static SlotManager
EMPTY
An empty SlotManager
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Constructor Summary
Constructors Constructor Description SlotManager()
The constructor should not be called directly.SlotManager(int n)
Create a SlotManager with a given number of slots
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
allocateSlotNumber(StructuredQName qName)
Allocate a slot number for a variableint
getNumberOfVariables()
Get number of variables (size of stack frame)java.util.List
getVariableMap()
Get the variable map (simply a list of variable names as structured QNames).void
setNumberOfVariables(int numberOfVariables)
Set the number of variables
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Field Detail
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EMPTY
public static SlotManager EMPTY
An empty SlotManager
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Constructor Detail
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SlotManager
public SlotManager()
The constructor should not be called directly. A new SlotManager should be obtained using the factory methodConfiguration.makeSlotManager()
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SlotManager
public SlotManager(int n)
Create a SlotManager with a given number of slots
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Method Detail
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getNumberOfVariables
public int getNumberOfVariables()
Get number of variables (size of stack frame)
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setNumberOfVariables
public void setNumberOfVariables(int numberOfVariables)
Set the number of variables- Parameters:
numberOfVariables
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allocateSlotNumber
public int allocateSlotNumber(StructuredQName qName)
Allocate a slot number for a variable
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getVariableMap
public java.util.List getVariableMap()
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.Changed in Saxon 9.0 to return a list of StructuredQName values rather than integers
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