net.sf.saxon.expr
Class QuantifiedExpression

java.lang.Object
  net.sf.saxon.expr.ComputedExpression
      net.sf.saxon.expr.Assignation
          net.sf.saxon.expr.QuantifiedExpression

All Implemented Interfaces:

Serializable, Binding, Expression

 class QuantifiedExpression
extends Assignation

A QuantifiedExpression tests whether some/all items in a sequence satisfy some condition.

Field Summary

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

action, declaration, sequence, slotNumber, variableName

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

lineNumber, NO_ARGUMENTS, staticProperties

Constructor Summary

QuantifiedExpression()

Method Summary

Expression	analyze(StaticContext env) Type-check the expression
int	computeCardinality() Determine the static cardinality
void	display(int level, NamePool pool) Diagnostic print of expression structure
boolean	effectiveBooleanValue(XPathContext context) Get the result as a boolean
Item	evaluateItem(XPathContext context) Evaluate the expression to return a singleton value
ItemType	getItemType() Determine the data type of the items returned by the expression
SequenceType	getRequiredType() Get data type of the range variable (part of the Binding interface)
void	setOperator(int operator)

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

evaluateVariable, getSubExpressions, getVariableName, promote, setAction, setSequence, setSlotNumber, setVariableDeclaration, simplify

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

computeDependencies, computeSpecialProperties, computeStaticProperties, dynamicError, evaluateAsString, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, iterate, markTailFunctionCalls, setLineNumber, typeError

Methods inherited from class java.lang.Object

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

Constructor Detail

QuantifiedExpression

QuantifiedExpression()

Method Detail

setOperator

public void setOperator(int operator)

computeCardinality

public int computeCardinality()

Determine the static cardinality

Specified by:

computeCardinality in class ComputedExpression

analyze

public Expression analyze(StaticContext env)
                   throws XPathException

Type-check the expression

Parameters:

env - the static context of the expression

Returns:

the original expression, rewritten to perform necessary run-time type checks, and to perform other type-related optimizations

Throws:

XPathException - if an error is discovered during this phase (typically a type error)

evaluateItem

public Item evaluateItem(XPathContext context)
                  throws XPathException

Evaluate the expression to return a singleton value

Specified by:

evaluateItem in interface Expression

Overrides:

evaluateItem in class ComputedExpression

Parameters:

context - The context in which the expression is to be evaluated

Returns:

the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence

Throws:

XPathException - if any dynamic error occurs evaluating the expression

effectiveBooleanValue

public boolean effectiveBooleanValue(XPathContext context)
                              throws XPathException

Get the result as a boolean

Specified by:

effectiveBooleanValue in interface Expression

Overrides:

effectiveBooleanValue in class ComputedExpression

Parameters:

context - The context in which the expression is to be evaluated

Returns:

the effective boolean value

Throws:

XPathException - if any dynamic error occurs evaluating the expression

getItemType

public ItemType getItemType()

Determine the data type of the items returned by the expression

Returns:

Type.BOOLEAN

getRequiredType

public SequenceType getRequiredType()

Get data type of the range variable (part of the Binding interface)

Specified by:

getRequiredType in interface Binding

Overrides:

getRequiredType in class Assignation

display

public void display(int level,
                    NamePool pool)

Diagnostic print of expression structure

Parameters:

level - indentation level for this expression