net.sf.saxon.expr

Class QuantifiedExpression

Implemented Interfaces:
Binding, EvaluableItem, InstructionInfoProvider, SequenceIterable, Serializable, SourceLocator

public 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, requiredType, sequence, slotNumber, variableName

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

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD, locationId, staticProperties

Method Summary

int
computeCardinality()
Determine the static cardinality
int
computeSpecialProperties()
Determine the special properties of this expression
Expression
copy()
Copy an expression.
boolean
effectiveBooleanValue(XPathContext context)
Get the result as a boolean
Item
evaluateItem(XPathContext context)
Evaluate the expression to return a singleton value
void
explain(ExpressionPresenter out)
Diagnostic print of expression structure.
ItemType
getItemType(TypeHierarchy th)
Determine the data type of the items returned by the expression
int
getOperator()
Get the operator, either Token.SOME or Token.EVERY
boolean
hasLoopingSubexpression(Expression child)
Given an expression that is an immediate child of this expression, test whether the evaluation of the parent expression causes the child expression to be evaluated repeatedly
Expression
optimize(ExpressionVisitor visitor, ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
void
setOperator(int operator)
Set the operator, either Token.SOME or Token.EVERY
Expression
typeCheck(ExpressionVisitor visitor, ItemType contextItemType)
Type-check the expression

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

addToPathMap, evaluateVariable, extendBindingList, getAction, getLocalSlotNumber, getRequiredSlots, getRequiredType, getSequence, getVariableName, getVariableQName, isAssignable, isGlobal, iterateSubExpressions, promote, promoteWhereClause, refineTypeInformation, replaceSubExpression, setAction, setRequiredType, setSequence, setSlotNumber, setVariableQName, simplify, suppressValidation

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

addToPathMap, adoptChildExpression, checkPermittedContents, computeCardinality, computeDependencies, computeSpecialProperties, computeStaticProperties, copy, display, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, explain, explain, findParentOf, getCardinality, getColumnNumber, getConstructType, getContainer, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getInstructionInfo, getIntrinsicDependencies, getItemType, getLineNumber, getLocationId, getLocationProvider, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, iterate, iterateEvents, iterateSubExpressions, markTailFunctionCalls, optimize, process, promote, replaceSubExpression, resetLocalStaticProperties, setContainer, setFiltered, setFlattened, setLocationId, simplify, staticTypeCheck, suppressValidation, toString, typeCheck, typeError

Method Details

computeCardinality

public int computeCardinality()
Determine the static cardinality
Overrides:
computeCardinality in interface Expression

computeSpecialProperties

public int computeSpecialProperties()
Determine the special properties of this expression
Overrides:
computeSpecialProperties in interface Expression

copy

public Expression copy()
Copy an expression. This makes a deep copy.
Overrides:
copy in interface Expression
Returns:
the copy of the original expression

effectiveBooleanValue

public boolean effectiveBooleanValue(XPathContext context)
            throws XPathException
Get the result as a boolean
Overrides:
effectiveBooleanValue in interface Expression

evaluateItem

public Item evaluateItem(XPathContext context)
            throws XPathException
Evaluate the expression to return a singleton value
Specified by:
evaluateItem in interface EvaluableItem
Overrides:
evaluateItem in interface Expression

explain

public void explain(ExpressionPresenter out)
Diagnostic print of expression structure. The abstract expression tree is written to the supplied output destination.
Overrides:
explain in interface Expression

getItemType

public ItemType getItemType(TypeHierarchy th)
Determine the data type of the items returned by the expression
Overrides:
getItemType in interface Expression
Parameters:
th - the type hierarchy cache
Returns:
Type.BOOLEAN

getOperator

public int getOperator()
Returns:
the operator

hasLoopingSubexpression

public boolean hasLoopingSubexpression(Expression child)
Given an expression that is an immediate child of this expression, test whether the evaluation of the parent expression causes the child expression to be evaluated repeatedly
Overrides:
hasLoopingSubexpression in interface Expression
Parameters:
child - the immediate subexpression
Returns:
true if the child expression is evaluated repeatedly

optimize

public Expression optimize(ExpressionVisitor visitor,
                           ItemType contextItemType)
            throws XPathException
Perform optimisation of an expression and its subexpressions.

This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.

Overrides:
optimize in interface Expression
Parameters:
visitor - an expression visitor
contextItemType - the static type of "." at the point where this expression is invoked. The parameter is set to null if it is known statically that the context item will be undefined. If the type of the context item is not known statically, the argument is set to Type.ITEM_TYPE
Returns:
the original expression, rewritten if appropriate to optimize execution
Throws:
XPathException - if an error is discovered during this phase (typically a type error)

setOperator

public void setOperator(int operator)
Parameters:
operator - the operator

typeCheck

public Expression typeCheck(ExpressionVisitor visitor,
                            ItemType contextItemType)
            throws XPathException
Type-check the expression
Overrides:
typeCheck in interface Expression