com.saxonica.ee.stream.adjunct

Class GroupAdjacentTester

java.lang.Object

com.saxonica.ee.stream.adjunct.GroupBoundaryTester

com.saxonica.ee.stream.adjunct.GroupAdjacentTester

public class GroupAdjacentTester
extends GroupBoundaryTester

This class implements GroupingFeed when the group-adjacent option is used. It contains the logic to decide whether an item starts a new group, based on computing the grouping key and comparing it with that of the previous item

Constructor Summary

Constructors

Constructor and Description
GroupAdjacentTester(ForEachGroup expression, XPathContext context)

Method Summary

Modifier and Type	Method and Description
AtomicSequence	getCurrentGroupingKey()
boolean	notifyItem() Signal an item that matches the selection has been found.

Methods inherited from class com.saxonica.ee.stream.adjunct.GroupBoundaryTester

getControllingExpression, getLocalContext, setControllingExpression

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupAdjacentTester

public GroupAdjacentTester(ForEachGroup expression,
                           XPathContext context)

Method Detail

notifyItem

public boolean notifyItem()
                   throws XPathException

Signal an item that matches the selection has been found.

Specified by:

notifyItem in class GroupBoundaryTester

Returns:

true if this item is the start of a new group

Throws:

XPathException - May be raised if a dynamic error occurs

getCurrentGroupingKey

public AtomicSequence getCurrentGroupingKey()