net.sf.saxon.expr

Class UnionCastableFunction

java.lang.Object

net.sf.saxon.om.AbstractItem

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.expr.UnionConstructorFunction

net.sf.saxon.expr.UnionCastableFunction

All Implemented Interfaces:

Callable, Function, GroundedValue, Item, Sequence

public class UnionCastableFunction
extends UnionConstructorFunction

Function to test castability to a union type

Field Summary

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

allowEmpty, resolver, targetType

Constructor Summary

Constructors

Constructor and Description
UnionCastableFunction(UnionType targetType, NamespaceResolver resolver, boolean allowEmpty) Create a cast expression to a union type

Method Summary

Modifier and Type	Method and Description
BooleanValue	call(XPathContext context, Sequence[] args) Invoke the function
FunctionItemType	getFunctionItemType() Get the item type of the function item
StructuredQName	getFunctionName() Get the name of the function, or null if it is anonymous

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

cast, getArity, getDescription, getNamespaceResolver, getOperandRole, getTargetType, isAllowEmpty

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

atomize, deepEquals, effectiveBooleanValue, export, getAnnotations, getOperandRoles, getStringValue, getStringValueCS, isArray, isMap, isTrustedResultType, makeNewContext, simplify, typeCheck

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

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

Methods inherited from class java.lang.Object

clone, equals, 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

UnionCastableFunction

public UnionCastableFunction(UnionType targetType,
                             NamespaceResolver resolver,
                             boolean allowEmpty)

Create a cast expression to a union type

Parameters:

targetType - the union type that is the result of the cast

resolver - namespace resolver in case the type is namespace-sensitive

allowEmpty - true if an empty sequence may be supplied as input, converting to an empty sequence on output

Method Detail

getFunctionItemType

public FunctionItemType getFunctionItemType()

Get the item type of the function item

Specified by:

getFunctionItemType in interface Function

Overrides:

getFunctionItemType in class UnionConstructorFunction

Returns:

the function item's type

getFunctionName

public StructuredQName getFunctionName()

Get the name of the function, or null if it is anonymous

Specified by:

getFunctionName in interface Function

Overrides:

getFunctionName in class UnionConstructorFunction

Returns:

the function name, or null for an anonymous function

call

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

Invoke the function

Specified by:

call in interface Callable

Specified by:

call in interface Function

Overrides:

call in class UnionConstructorFunction

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