net.sf.saxon.expr

Class LocalVariableReference

java.lang.Object

net.sf.saxon.expr.Expression

net.sf.saxon.expr.VariableReference

net.sf.saxon.expr.LocalVariableReference

All Implemented Interfaces:

SourceLocator, BindingReference, IdentityComparable, InstructionInfo

Direct Known Subclasses:

JAXPVariableReference

public class LocalVariableReference
extends VariableReference

Variable reference: a reference to a local variable. This subclass of VariableReference bypasses the Binding object to get the value directly from the relevant slot in the local stackframe.

Field Summary

Fields inherited from class net.sf.saxon.expr.VariableReference

binding, constantValue, staticType

Fields inherited from class net.sf.saxon.expr.Expression

EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD

Constructor Summary

Constructors

Constructor and Description
LocalVariableReference() Create a local variable reference.
LocalVariableReference(LocalBinding binding) Create a LocalVariableReference bound to a given Binding

Method Summary

Methods

Modifier and Type	Method and Description
Expression	copy() Create a clone copy of this VariableReference
Sequence	evaluateVariable(XPathContext c) Return the value of the variable
LocalBinding	getBinding() Get the object bound to the variable
ExpressionCompiler	getExpressionCompiler() Return the compiler of the LocalVariableReference expression
int	getSlotNumber() Get the slot number allocated to this local variable
void	setSlotNumber(int slotNumber) Set the slot number for this local variable, that is, its position in the local stack frame

Methods inherited from class net.sf.saxon.expr.VariableReference

addToPathMap, computeCardinality, computeSpecialProperties, copyFrom, equals, evaluateItem, explain, fixup, getDisplayName, getEQName, getImplementationMethod, getIntegerBounds, getIntrinsicDependencies, getItemType, getStreamingAdjunct, hashCode, isCompatible, isFiltered, isFlattened, isInLoop, iterate, optimize, process, promote, refineVariableType, setFiltered, setFlattened, setStaticType, toShortString, toString, typeCheck

Methods inherited from class net.sf.saxon.expr.Expression

adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, clearStreamabilityData, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getConfiguration, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExpressionName, getHostLanguage, getLineNumber, getLocationId, getObjectName, getPosture, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamability, getSweep, getSystemId, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isIdentical, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterateEvents, makeStreamingAdjunct, markTailFunctionCalls, operandList, operands, replaceOperand, resetLocalStaticProperties, setContainer, setEvaluationMethod, setLocationId, setPostureAndSweep, simplify, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, typeError, unordered

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

LocalVariableReference

public LocalVariableReference()

Create a local variable reference. The binding and slot number will be supplied later

LocalVariableReference

public LocalVariableReference(LocalBinding binding)

Create a LocalVariableReference bound to a given Binding

Parameters:

binding - the binding (that is, the declaration of this local variable)

Method Detail

copy

public Expression copy()

Create a clone copy of this VariableReference

Specified by:

copy in class VariableReference

Returns:

the cloned copy

getBinding

public LocalBinding getBinding()

Description copied from class: VariableReference

Get the object bound to the variable

Overrides:

getBinding in class VariableReference

Returns:

the Binding which declares this variable and associates it with a value

setSlotNumber

public void setSlotNumber(int slotNumber)

Set the slot number for this local variable, that is, its position in the local stack frame

Parameters:

slotNumber - the slot number to be used

getSlotNumber

public int getSlotNumber()

Get the slot number allocated to this local variable

Returns:

the slot number

evaluateVariable

public Sequence evaluateVariable(XPathContext c)
                          throws XPathException

Return the value of the variable

Overrides:

evaluateVariable in class VariableReference

Parameters:

c - the XPath dynamic context

Returns:

the value of the variable

Throws:

XPathException - if any dynamic error occurs while evaluating the variable

getExpressionCompiler

public ExpressionCompiler getExpressionCompiler()

Return the compiler of the LocalVariableReference expression

Overrides:

getExpressionCompiler in class VariableReference

Returns:

the relevant ExpressionCompiler