Package stream.nebula.operators

Class Aggregation

java.lang.Object

stream.nebula.operators.Aggregation

public class Aggregation
extends java.lang.Object

Represents aggregation functions on windows and provides factory methods to create these.

Method Summary

Modifier and Type	Method	Description
Aggregation	as(java.lang.String aggregatedAttribute)
static Aggregation	average(java.lang.String fieldName)	Create a Avg aggregation function.
static Aggregation	count()	Create a Count aggregation function.
java.lang.String	getAggregationFieldName()
java.lang.String	getAggregationFunction()
java.lang.String	getNameOfAggregatedAttribute()
static Aggregation	max(java.lang.String fieldName)	Create a Max aggregation function.
static Aggregation	median(java.lang.String fieldName)	Create a Median aggregation function.
static Aggregation	min(java.lang.String fieldName)	Create a Min aggregation function.
static Aggregation	sum(java.lang.String fieldName)	Create a Sum aggregation function.

Methods inherited from class java.lang.Object

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

Method Detail

sum

public static Aggregation sum(java.lang.String fieldName)

Create a Sum aggregation function.

Parameters:

fieldName - The aggregated field.

Returns:

A Sum aggregation.

Throws:

java.lang.NullPointerException - If fieldName is null.

java.lang.IllegalArgumentException - If fieldName is empty.

average

public static Aggregation average(java.lang.String fieldName)

Create a Avg aggregation function.

Parameters:

fieldName - The aggregated field.

Returns:

A Avg aggregation.

Throws:

java.lang.NullPointerException - If fieldName is null.

java.lang.IllegalArgumentException - If fieldName is empty.

min

public static Aggregation min(java.lang.String fieldName)

Create a Min aggregation function.

Parameters:

fieldName - The aggregated field.

Returns:

A Min aggregation.

Throws:

java.lang.NullPointerException - If fieldName is null.

java.lang.IllegalArgumentException - If fieldName is empty.

max

public static Aggregation max(java.lang.String fieldName)

Create a Max aggregation function.

Parameters:

fieldName - The aggregated field.

Returns:

A Max aggregation.

Throws:

java.lang.NullPointerException - If fieldName is null.

java.lang.IllegalArgumentException - If fieldName is empty.

median

public static Aggregation median(java.lang.String fieldName)

Create a Median aggregation function.

Parameters:

fieldName - The aggregated field.

Returns:

A Median aggregation.

Throws:

java.lang.NullPointerException - If fieldName is null.

java.lang.IllegalArgumentException - If fieldName is empty.

count

public static Aggregation count()

Create a Count aggregation function. Note: Count does not aggregate over an argument.

Returns:

A Count aggregation.

as

public Aggregation as(java.lang.String aggregatedAttribute)

getAggregationFieldName

public java.lang.String getAggregationFieldName()

getAggregationFunction

public java.lang.String getAggregationFunction()

getNameOfAggregatedAttribute

public java.lang.String getNameOfAggregatedAttribute()