Package stream.nebula.operators

Class WindowOperator

java.lang.Object

stream.nebula.operators.Operator

stream.nebula.operators.KeyedWindowOperator

stream.nebula.operators.WindowOperator

public class WindowOperator
extends KeyedWindowOperator

This class allows the specification of window grouping attributes in the fluid Query API.

It extends the builder pattern of KeyedWindowOperator with the byKey(java.lang.String...) method.

See Also:

KeyedWindowOperator

Field Summary

Fields inherited from class stream.nebula.operators.Operator

childOperator

Constructor Summary

Constructors

Constructor	Description
WindowOperator(@NonNull Operator childOperator, @NonNull WindowDefinition windowDefinition, @NonNull Query query)	Delegates to the KeyedWindowOperator(stream.nebula.operators.Operator, stream.nebula.operators.window.WindowDefinition, stream.nebula.runtime.Query) constructor.

Method Summary

Modifier and Type	Method	Description
KeyedWindowOperator	byKey(@NonNull java.lang.String... keyFields)	Set the stream attribute names on which the window is grouped.

Methods inherited from class stream.nebula.operators.KeyedWindowOperator

apply, getAggregations, getKeyFields, getWindowDefinition, setKeyFields

Methods inherited from class stream.nebula.operators.Operator

getChildOperator

Methods inherited from class java.lang.Object

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

Constructor Detail

WindowOperator

public WindowOperator(@NonNull Operator childOperator,
                      @NonNull WindowDefinition windowDefinition,
                      @NonNull Query query)
               throws java.lang.IllegalArgumentException

Delegates to the KeyedWindowOperator(stream.nebula.operators.Operator, stream.nebula.operators.window.WindowDefinition, stream.nebula.runtime.Query) constructor.

Throws:

java.lang.IllegalArgumentException

Method Detail

byKey

public KeyedWindowOperator byKey(@NonNull java.lang.String... keyFields)
                          throws java.lang.IllegalArgumentException

Set the stream attribute names on which the window is grouped.

Parameters:

keyFields - A variable number of attribute names.

Throws:

java.lang.IllegalArgumentException - If keyFields is null.