Package net.sf.saxon.functions

Class CollatingFunction

java.lang.Object

net.sf.saxon.expr.ComputedExpression

net.sf.saxon.expr.FunctionCall

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.CollatingFunction

All Implemented Interfaces:

Serializable, SourceLocator, Container, Expression, InstructionInfoProvider

Direct Known Subclasses:

Compare, Contains, DeepEqual, DistinctValues, IndexOf, Minimax

public abstract class CollatingFunction
extends SystemFunction

Abstract superclass for all functions that take an optional collation argument

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Comparator	collation

Fields inherited from class net.sf.saxon.functions.SystemFunction

operation

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

argument

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

locationId, staticProperties

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

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD

Constructor Summary

Constructors

Constructor	Description
CollatingFunction()

Method Summary

Modifier and Type	Method	Description
void	checkArguments(StaticContext env)	Method called during static type checking
protected GenericAtomicComparer	getAtomicComparer(int arg, XPathContext context)	Get a GenericAtomicComparer that can be used to compare values
protected Comparator	getCollator(int arg, XPathContext context)	Get a collator suitable for comparing strings.

Methods inherited from class net.sf.saxon.functions.SystemFunction

addContextDocumentArgument, computeCardinality, computeSpecialProperties, display, getDetails, getErrorCodeForTypeErrors, getItemType, getRequiredType, main, makeSystemFunction, setDetails, useContextItemAsDefault

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

checkArgumentCount, getArguments, getDisplayName, getFunctionNameCode, getNumberOfArguments, iterateSubExpressions, optimize, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionNameCode, simplify, simplifyArguments, typeCheck

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

adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, getCardinality, getColumnNumber, getConstructType, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getInstructionInfo, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, iterate, markTailFunctionCalls, process, resetStaticProperties, setLocationId, setParentExpression, setParentExpression, suppressValidation, typeError

Methods inherited from class java.lang.Object

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

Field Details

collation

protected transient Comparator collation

Constructor Details

CollatingFunction

public CollatingFunction()

Method Details

checkArguments

public void checkArguments(StaticContext env)
                    throws XPathException

Description copied from class: SystemFunction

Method called during static type checking

Overrides:

checkArguments in class SystemFunction

Throws:

XPathException

getAtomicComparer

protected GenericAtomicComparer getAtomicComparer(int arg,
 XPathContext context)
                                           throws XPathException

Get a GenericAtomicComparer that can be used to compare values

Parameters:

arg - the position of the argument (starting at 0) containing the collation name. If this argument was not supplied, the default collation is used

context - The dynamic evaluation context.

Throws:

XPathException

getCollator

protected Comparator getCollator(int arg,
 XPathContext context)
                          throws XPathException

Get a collator suitable for comparing strings. Returns the collator specified in the given function argument if present, otherwise returns the default collator.

Parameters:

arg - The argument position (counting from zero) that holds the collation URI if present

context - The dynamic context

Returns:

a Comparator, which will either be a java.text.Collator, or a CodepointCollator

Throws:

XPathException