Package net.sf.saxon.expr

Class ListConstructorFunction

java.lang.Object

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.expr.ListConstructorFunction

All Implemented Interfaces:

Callable, FunctionItem, GroundedValue, Item, Sequence

Direct Known Subclasses:

ListCastableFunction

public class ListConstructorFunction
extends AbstractFunction

A function item representing a constructor function for a list type

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	allowEmpty
protected SimpleType	memberType
protected NamespaceResolver	nsResolver
protected ListType	targetType

Constructor Summary

Constructors

Constructor	Description
ListConstructorFunction(ListType targetType, NamespaceResolver resolver, boolean allowEmpty)	Create the constructor function.

Method Summary

Modifier and Type	Method	Description
AtomicSequence	call(XPathContext context, Sequence[] args)	Invoke the function
int	getArity()	Get the arity of the function
String	getDescription()	Get a description of this function for use in error messages.
FunctionItemType	getFunctionItemType()	Get the item type of the function item
StructuredQName	getFunctionName()	Get the name of the function, or null if it is anonymous
SimpleType	getMemberType()	Get the list item type (member type)
ListType	getTargetType()	Get the list type
boolean	isAllowEmpty()	Ask whether an empty sequence is allowed

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

atomize, deepEqual40, deepEquals, effectiveBooleanValue, export, getAnnotations, getOperandRoles, getUnicodeStringValue, isArray, isMap, isTrustedResultType, makeNewContext, simplify, toShortString, typeCheck

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.FunctionItem

getGenre, isSequenceVariadic

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

asIterable, concatenate, containsNode, materialize

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

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

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

makeRepeatable

Field Details

targetType

protected ListType targetType

nsResolver

protected NamespaceResolver nsResolver

allowEmpty

protected boolean allowEmpty

memberType

protected SimpleType memberType

Constructor Details

ListConstructorFunction

public ListConstructorFunction(ListType targetType,
 NamespaceResolver resolver,
 boolean allowEmpty)
                        throws MissingComponentException

Create the constructor function.

Parameters:

targetType - the type to which the function will convert its input

resolver - namespace resolver for use if the target type is namespace-sensitive

allowEmpty - true if the input is allowed to be an empty sequence

Throws:

MissingComponentException - if the target type has not been declared

Method Details

getTargetType

public ListType getTargetType()

Get the list type

Returns:

the last type to which we are casting

getMemberType

public SimpleType getMemberType()

Get the list item type (member type)

Returns:

the item type of the list

isAllowEmpty

public boolean isAllowEmpty()

Ask whether an empty sequence is allowed

Returns:

true if passing an empty sequence is allowed (and returns empty)

getFunctionItemType

public FunctionItemType getFunctionItemType()

Get the item type of the function item

Returns:

the function item's type

getFunctionName

public StructuredQName getFunctionName()

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

Returns:

the function name, or null for an anonymous inline function

getDescription

public String getDescription()

Get a description of this function for use in error messages. For named functions, the description is the function name (as a lexical QName). For others, it might be, for example, "inline function", or "partially-applied ends-with function".

Returns:

a description of the function for use in error messages

getArity

public int getArity()

Get the arity of the function

Returns:

the number of arguments in the function signature

call

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

Invoke the 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