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 Description

GroupAdjacentTester(ForEachGroup expression, XPathContext context)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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()
```