net.sf.saxon.functions

Class CollectionFn

java.lang.Object

net.sf.saxon.om.AbstractItem

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.CollectionFn

All Implemented Interfaces:

PullEvent, Callable, Function, GroundedValue, Item, Sequence

public class CollectionFn
extends SystemFunction
implements Callable

Implement the fn:collection() function. This is responsible for calling the registered CollectionFinder. For the effect of the default system-supplied CollectionURIResolver, see StandardCollectionFinder

Field Summary

Fields

Modifier and Type	Field and Description
static ResourceCollection	EMPTY_COLLECTION An empty collection
static String	EMPTY_COLLECTION_URI URI representing a collection that is always empty, regardless of any collection URI resolver

Constructor Summary

Constructors

Constructor and Description
CollectionFn()

Method Summary

Methods

Modifier and Type	Method and Description
Sequence	call(XPathContext context, Sequence[] arguments) Dynamic call on collection() function
int	getSpecialProperties(Expression[] arguments) Determine the special properties of this function.

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, getStaticBaseUriString, getStreamingAdjunct, importAttributes, makeCall, makeFunction, makeFunctionCall, makeOptimizedFunctionCall, 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

Field Detail

EMPTY_COLLECTION_URI

public static String EMPTY_COLLECTION_URI

URI representing a collection that is always empty, regardless of any collection URI resolver

EMPTY_COLLECTION

public static final ResourceCollection EMPTY_COLLECTION

An empty collection

Constructor Detail

CollectionFn

public CollectionFn()

Method Detail

getSpecialProperties

public int getSpecialProperties(Expression[] arguments)

Description copied from class: SystemFunction

Determine the special properties of this function. The general rule is that a system function call is non-creative if its return type is atomic, or if all its arguments are non-creative. This is overridden for the generate-id() function, which is considered creative if its operand is creative (because the result depends on the identity of the operand)

Overrides:

getSpecialProperties in class SystemFunction

Parameters:

arguments - the actual arguments supplied in a call to the function

call

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

Dynamic call on collection() function

Specified by:

call in interface Callable

Specified by:

call in interface Function

Parameters:

context - the dynamic evaluation context

arguments - the values of the arguments, supplied as Sequences.

Returns:

the sequence of nodes forming the collection

Throws:

XPathException