net.sf.saxon.functions

Class CollatingFunctionFree

java.lang.Object

net.sf.saxon.om.AbstractItem

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.CollatingFunctionFree

All Implemented Interfaces:

PullEvent, Callable, Function, GroundedValue, Item, Sequence

public class CollatingFunctionFree
extends SystemFunction

Generic class for all functions that take an optional collation argument, where the collation argument is supplied and has not yet been resolved. The class provides methods that either do early evaluation of the collation argument (converting the function to the corresponding instance of CollatingFunctionFixed, or failing that, the collation argument is evaluated at run-time.

Constructor Summary

Constructors

Constructor and Description
CollatingFunctionFree()

Method Summary

Methods

Modifier and Type	Method and Description
CollatingFunctionFixed	bindCollation(String collationName)
Sequence	call(XPathContext context, Sequence[] args) Invoke the function.
static String	expandCollationURI(String collationName, URI expressionBaseURI) Expand a collation URI, which may be a relative URI reference
StreamingAdjunct	getStreamingAdjunct() Get a class that supports streamed evaluation of this expression
Expression	makeOptimizedFunctionCall(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo, Expression... arguments) Allow the function to create an optimized call based on the values of the actual arguments

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

equals, export, exportAttributes, getArity, getCardinality, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getExpressionCompiler, getFunctionItemType, getFunctionName, getIntegerBounds, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, importAttributes, makeCall, makeFunction, makeFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, typeCheckCaller

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

atomize, deepEquals, effectiveBooleanValue, getStringValue, getStringValueCS, isArray, isMap, optimize, simplify, typeCheck

Methods inherited from class net.sf.saxon.om.AbstractItem

getLength, head, itemAt, iterate, reduce, subsequence

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.om.Function

iterate

Methods inherited from interface net.sf.saxon.om.Item

head

Methods inherited from interface net.sf.saxon.om.GroundedValue

getLength, head, itemAt, reduce, subsequence

Constructor Detail

CollatingFunctionFree

public CollatingFunctionFree()

Method Detail

makeOptimizedFunctionCall

public Expression makeOptimizedFunctionCall(ExpressionVisitor visitor,
                                   ContextItemStaticInfo contextInfo,
                                   Expression... arguments)
                                     throws XPathException

Allow the function to create an optimized call based on the values of the actual arguments

Overrides:

makeOptimizedFunctionCall in class SystemFunction

Parameters:

visitor - the expression visitor

contextInfo - information about the context item

arguments - the supplied arguments to the function call

Returns:

either a function call on this function, or an expression that delivers the same result, or null indicating that no optimization has taken place

Throws:

XPathException - if an error is detected

bindCollation

public CollatingFunctionFixed bindCollation(String collationName)
                                     throws XPathException

Throws:

XPathException

expandCollationURI

public static String expandCollationURI(String collationName,
                        URI expressionBaseURI)
                                 throws XPathException

Expand a collation URI, which may be a relative URI reference

Parameters:

collationName - the collation URI as provided

expressionBaseURI - the base URI against which the collation URI will be resolved if it is relative

Returns:

the resolved (expanded) absolute collation URI

Throws:

XPathException - if the collation URI cannot be resolved

call

public Sequence call(XPathContext context,
            Sequence[] args)
              throws XPathException

Invoke the function. This is done in effect by currying the function: that is, creating a new function in which the collation argument is bound, and then invoking that new function.

Parameters:

context - the XPath dynamic evaluation context

args - the actual arguments to be supplied

Returns:

the result of invoking the function

Throws:

XPathException - if a dynamic error occurs within the function

getStreamingAdjunct

public StreamingAdjunct getStreamingAdjunct()

Description copied from class: SystemFunction

Get a class that supports streamed evaluation of this expression

Overrides:

getStreamingAdjunct in class SystemFunction

Returns:

the relevant StreamingAdjunct, or null if none is available