Package com.saxonica.functions.extfn

Class GroupStarting

java.lang.Object

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

com.saxonica.functions.extfn.GroupStarting

All Implemented Interfaces:

Callable, FunctionItem, GroundedValue, Item, Sequence

public class GroupStarting
extends SystemFunction

This class supports the extension function saxon:group-starting. This takes two arguments: the first is a sequence of items, the second is a function used as a predicate. The function is applied to each item in the sequence: if the effective boolean value of the result is true, the item is called a matching item. The result of the function is a sequence of arrays, where the members of each array are single items, and the flattened sequence of arrays is the same as the input sequence.

If the input sequence is empty, the result sequence is empty.

In all other cases (a) the first item in the result is an array containing those items from the input that precede the first matching item; this array will be empty if the first item in the input is a matching item; (b) every other item in the result is an non-empty array containing a subsequence of the input in which the first member is a matching item and the remaining members are non-matching items.

Constructor Summary

Constructors

Constructor	Description
GroupStarting()

Method Summary

Modifier and Type	Method	Description
Sequence	call(XPathContext context, Sequence[] arguments)	Evaluate this function call at run-time

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

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

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

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

Methods inherited from class java.lang.Object

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

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

getGenre

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

Constructor Detail

GroupStarting

public GroupStarting()

Method Detail

call

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

Evaluate this function call at run-time

Parameters:

context - The XPath dynamic evaluation context

arguments - The values of the arguments to the function call.

Returns:

the results of the function, as a sequence of arrays

Throws:

XPathException - if a dynamic error occurs during evaluation of the function. The Saxon run-time code will add information about the error location.