Package net.sf.saxon.functions.registry

Class BuiltInFunctionSet.Entry

java.lang.Object

net.sf.saxon.functions.registry.BuiltInFunctionSet.Entry

Enclosing class:

BuiltInFunctionSet

public static class BuiltInFunctionSet.Entry
extends java.lang.Object

An entry in the table describing the properties of a function

Field Summary

Fields

Modifier and Type	Field	Description
SequenceType[]	argumentTypes	An array holding the types of the arguments to the function
int	arity	The arity of the function
int	cardinality	The cardinality of the result of the function
java.lang.Class	implementationClass	The class containing the implementation of this function (always a subclass of SystemFunction)
ItemType	itemType	The item type of the result of the function
StructuredQName	name	The name of the function as a QName
OptionsParameter	optionDetails	For options parameters, details of the accepted options, their defaults, and required type
int	properties	Any additional properties.
Sequence[]	resultIfEmpty	An array holding, for each declared argument, the value that is to be returned if an empty sequence as the value of this argument allows the result to be determined irrespective of the values of the other arguments; null if there is no such calculation possible
OperandUsage[]	usage	The syntactic context of each argument for the purposes of streamability analysis

Constructor Summary

Constructors

Constructor	Description
Entry()

Method Summary

Modifier and Type	Method	Description
BuiltInFunctionSet.Entry	arg(int a, ItemType type, int options, Sequence resultIfEmpty)	Add information to a function entry about the argument types of the function
BuiltInFunctionSet.Entry	optionDetails(OptionsParameter details)	Add details for options parameters (only applies to one argument, the function is expected to know which)

Methods inherited from class java.lang.Object

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

Field Detail

name

public StructuredQName name

The name of the function as a QName

implementationClass

public java.lang.Class implementationClass

The class containing the implementation of this function (always a subclass of SystemFunction)

arity

public int arity

The arity of the function

itemType

public ItemType itemType

The item type of the result of the function

cardinality

public int cardinality

The cardinality of the result of the function

usage

public OperandUsage[] usage

The syntactic context of each argument for the purposes of streamability analysis

argumentTypes

public SequenceType[] argumentTypes

An array holding the types of the arguments to the function

resultIfEmpty

public Sequence[] resultIfEmpty

An array holding, for each declared argument, the value that is to be returned if an empty sequence as the value of this argument allows the result to be determined irrespective of the values of the other arguments; null if there is no such calculation possible

properties

public int properties

Any additional properties. Various bit settings are defined: for example SAME_AS_FIRST_ARGUMENT indicates that the result type is the same as the type of the first argument

optionDetails

public OptionsParameter optionDetails

For options parameters, details of the accepted options, their defaults, and required type

Constructor Detail

Entry

public Entry()

Method Detail

arg

public BuiltInFunctionSet.Entry arg(int a,
                                    ItemType type,
                                    int options,
                                    Sequence resultIfEmpty)

Add information to a function entry about the argument types of the function

Parameters:

a - the position of the argument, counting from zero

type - the item type of the argument

options - the cardinality and usage of the argument

resultIfEmpty - the value returned by the function if an empty sequence appears as the value of this argument, in the case when this result is unaffected by any other arguments. Supply null if this does not apply.

Returns:

this entry (to allow chaining)

optionDetails

public BuiltInFunctionSet.Entry optionDetails(OptionsParameter details)

Add details for options parameters (only applies to one argument, the function is expected to know which)