Class GenerateId_1

java.lang.Object

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.ScalarSystemFunction

net.sf.saxon.functions.GenerateId_1

All Implemented Interfaces:

Callable, FunctionItem, GroundedValue, Item, Sequence

public class GenerateId_1
extends ScalarSystemFunction

This class supports the generate-id() function with one argument

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	GenerateId_1.GenerateIdElaborator

Constructor Summary

Constructors

Constructor	Description
GenerateId_1()

Method Summary

Modifier and Type	Method	Description
AtomicValue	evaluate(Item arg, XPathContext context)	Abstract method that must be supplied in subclasses to perform the evaluation
static StringValue	generateId(NodeInfo node)
Elaborator	getElaborator()	Make an elaborator for this expression
int	getSpecialProperties(Expression[] arguments)	Determine the special properties of this expression.
Sequence	resultWhenEmpty()	Method that may be supplied in subclasses, to indicate the result that is returned when an empty sequence is supplied as the argument value.

Methods inherited from class ScalarSystemFunction

call, makeFunctionCall

Methods inherited from class SystemFunction

dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCardinality, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getStaticBaseUriString, getStreamerName, getUniStringArg, hashCode, importAttributes, isSequenceVariadic, isTrustedResultType, makeCall, makeFunction, makeFunction40, makeOptimizedFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, toShortString, toString, typeCheckCaller

Methods inherited from class AbstractFunction

atomize, deepEqual40, deepEquals, effectiveBooleanValue, getAnnotations, getUnicodeStringValue, isArray, isMap, makeNewContext, simplify, typeCheck

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface FunctionItem

getGenre

Methods inherited from interface GroundedValue

asIterable, concatenate, containsNode, materialize

Methods inherited from interface Item

getLength, getStringValue, head, isStreamed, itemAt, iterate, reduce, subsequence

Methods inherited from interface Sequence

makeRepeatable

Constructor Details

GenerateId_1

public GenerateId_1()

Method Details

getSpecialProperties

public int getSpecialProperties(Expression[] arguments)

Determine the special properties of this expression. The generate-id() function is a special case: it is considered creative if its operand is creative, so that generate-id(f()) is not taken out of a loop

Overrides:

getSpecialProperties in class SystemFunction

Parameters:

arguments - the expressions supplied as arguments in the function call

Returns:

the properties

resultWhenEmpty

public Sequence resultWhenEmpty()

Description copied from class: ScalarSystemFunction

Method that may be supplied in subclasses, to indicate the result that is returned when an empty sequence is supplied as the argument value. The default is to return the empty sequence

Overrides:

resultWhenEmpty in class ScalarSystemFunction

Returns:

the result of evaluation when the supplied argument is an empty sequence

evaluate

public AtomicValue evaluate(Item arg,
 XPathContext context)
                     throws XPathException

Description copied from class: ScalarSystemFunction

Abstract method that must be supplied in subclasses to perform the evaluation

Specified by:

evaluate in class ScalarSystemFunction

Parameters:

arg - the supplied argument

context - the dynamic context

Returns:

the result of the evaluation

Throws:

XPathException - if a dynamic error occurs

generateId

public static StringValue generateId(NodeInfo node)

getElaborator

public Elaborator getElaborator()

Make an elaborator for this expression

Overrides:

getElaborator in class SystemFunction

Returns:

a suitable elaborator