net.sf.saxon.expr

Class IsLastExpression

public final class IsLastExpression extends ComputedExpression

A position() eq last() expression, generated by the optimizer.

Constructor Summary
	IsLastExpression(boolean condition) Construct a condition that tests position() eq last() (if condition is true) or position() ne last() (if condition is false).

Method Summary
int	computeCardinality() Determine the static cardinality
int	computeSpecialProperties() Determine the special properties of this expression
void	display(int level, NamePool pool, PrintStream out) Diagnostic print of expression structure
Item	evaluateItem(XPathContext c)
boolean	getCondition()
int	getIntrinsicDependencies() Get the dependencies of this expression on the context
ItemType	getItemType(TypeHierarchy th) Determine the data type of the expression
Expression	optimize(Optimizer opt, StaticContext env, ItemType contextItemType)
Expression	simplify(StaticContext env)
Expression	typeCheck(StaticContext env, ItemType contextItemType)

Constructor Detail

IsLastExpression

public IsLastExpression(boolean condition)

Construct a condition that tests position() eq last() (if condition is true) or position() ne last() (if condition is false).

Method Detail

computeCardinality

public int computeCardinality()

Determine the static cardinality

computeSpecialProperties

public int computeSpecialProperties()

Determine the special properties of this expression

Returns: NON_CREATIVE.

display

public void display(int level, NamePool pool, PrintStream out)

Diagnostic print of expression structure

evaluateItem

public Item evaluateItem(XPathContext c)

getCondition

public boolean getCondition()

getIntrinsicDependencies

public int getIntrinsicDependencies()

Get the dependencies of this expression on the context

getItemType

public ItemType getItemType(TypeHierarchy th)

Determine the data type of the expression

Parameters: th

Returns: Type.BOOLEAN

optimize

public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType)

simplify

public Expression simplify(StaticContext env)

typeCheck

public Expression typeCheck(StaticContext env, ItemType contextItemType)