com.espertech.esper.epl.agg.aggregator
Class AggregatorFirstEver

java.lang.Object
  com.espertech.esper.epl.agg.aggregator.AggregatorFirstEver

All Implemented Interfaces:

AggregationMethod

Direct Known Subclasses:

AggregatorFirstEverFilter

public class AggregatorFirstEver
extends java.lang.Object
implements AggregationMethod

Aggregator for the very first value.

Field Summary

protected java.lang.Object	firstValue
protected boolean	isSet
protected java.lang.Class	type

Constructor Summary

AggregatorFirstEver(java.lang.Class type)
Ctor.

Method Summary

void	clear() Clear out the collection.
void	enter(java.lang.Object object) Apply the value as entering aggregation (entering window).
java.lang.Object	getFirstValue()
java.lang.Object	getValue() Returns the current value held.
java.lang.Class	getValueType() Returns the type of the current value.
boolean	isSet()
void	leave(java.lang.Object object) Apply the value as leaving aggregation (leaving window).
void	setFirstValue(java.lang.Object firstValue)
void	setSet(boolean set)

Methods inherited from class java.lang.Object

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

Field Detail

type

protected final java.lang.Class type

isSet

protected boolean isSet

firstValue

protected java.lang.Object firstValue

Constructor Detail

AggregatorFirstEver

public AggregatorFirstEver(java.lang.Class type)

Ctor.

Parameters:

type - type of value returned

Method Detail

clear

public void clear()

Description copied from interface: AggregationMethod

Clear out the collection.

Specified by:

clear in interface AggregationMethod

enter

public void enter(java.lang.Object object)

Description copied from interface: AggregationMethod

Apply the value as entering aggregation (entering window).

The value can be null since 'null' values may be counted as unique separate values.

Specified by:

enter in interface AggregationMethod

Parameters:

object - to add to aggregate

leave

public void leave(java.lang.Object object)

Description copied from interface: AggregationMethod

Apply the value as leaving aggregation (leaving window).

The value can be null since 'null' values may be counted as unique separate values.

Specified by:

leave in interface AggregationMethod

Parameters:

object - to remove from aggregate

getValue

public java.lang.Object getValue()

Description copied from interface: AggregationMethod

Returns the current value held.

Specified by:

getValue in interface AggregationMethod

Returns:

current value

getValueType

public java.lang.Class getValueType()

Description copied from interface: AggregationMethod

Returns the type of the current value.

Specified by:

getValueType in interface AggregationMethod

Returns:

type of values held

isSet

public boolean isSet()

setSet

public void setSet(boolean set)

getFirstValue

public java.lang.Object getFirstValue()

setFirstValue

public void setFirstValue(java.lang.Object firstValue)