Package stream.nebula.operators.window

Class ThresholdWindow

java.lang.Object

stream.nebula.operators.window.ThresholdWindow

All Implemented Interfaces:

ContentBasedWindowDefinition, WindowDefinition

public class ThresholdWindow
extends java.lang.Object
implements ContentBasedWindowDefinition

A content-based window type. A window starts whenever a tuple arrives that fulfills the specified predicate. Respectively, a window is closed whenever a tuple occurs that does not satisfy the predicate. Additionally, a minCount can be defined to control the minimal window size for computation, e.g., if a minCount of 3 is set, only windows with at least 3 tuples are computed.

Method Summary

Modifier and Type	Method	Description
int	getMinCount()	Access the minimal count required for a window
Expression	getPredicate()	Access the predicate of the threshold window
static ThresholdWindow	of(Expression predicate)	Calls the internal threshold window constructor
static ThresholdWindow	of(Expression predicate, int minCount)	Calls the internal threshold window constructor

Methods inherited from class java.lang.Object

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

Method Detail

of

public static ThresholdWindow of(Expression predicate)

Calls the internal threshold window constructor

Parameters:

predicate - to be met within the window

Returns:

a new threshold window

of

public static ThresholdWindow of(Expression predicate,
                                 int minCount)

Calls the internal threshold window constructor

Parameters:

predicate - to be met within the window

minCount - the minimal number of tuples to occur within one window

Returns:

a new threshold window

getPredicate

public Expression getPredicate()

Access the predicate of the threshold window

Returns:

The predicate

getMinCount

public int getMinCount()

Access the minimal count required for a window

Returns:

The minCount