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

Fields

Modifier and Type	Field and Description
protected java.lang.Object	firstValue
protected boolean	isSet

Constructor Summary

Constructors

Constructor and Description
AggregatorFirstEver()

Method Summary

Modifier and Type	Method and Description
static void	applyEnterCodegen(boolean hasFilter, int column, CodegenMethodNode method, ExprForgeCodegenSymbol symbols, ExprForge[] forges, CodegenClassScope classScope)
void	clear() Clear out the collection.
static void	clearCodegen(int column, CodegenMethodNode method)
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.
static void	getValueCodegen(int column, CodegenMethodNode method)
boolean	isSet()
void	leave(java.lang.Object object) Apply the value as leaving aggregation (leaving window).
static void	rowMemberCodegen(int column, CodegenCtor ctor, CodegenMembersColumnized membersColumnized)
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

isSet

protected boolean isSet

firstValue

protected java.lang.Object firstValue

Constructor Detail

AggregatorFirstEver

public AggregatorFirstEver()

Method Detail

rowMemberCodegen

public static void rowMemberCodegen(int column,
                                    CodegenCtor ctor,
                                    CodegenMembersColumnized membersColumnized)

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

applyEnterCodegen

public static void applyEnterCodegen(boolean hasFilter,
                                     int column,
                                     CodegenMethodNode method,
                                     ExprForgeCodegenSymbol symbols,
                                     ExprForge[] forges,
                                     CodegenClassScope classScope)

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

clear

public void clear()

Description copied from interface: AggregationMethod

Clear out the collection.

Specified by:

clear in interface AggregationMethod

clearCodegen

public static void clearCodegen(int column,
                                CodegenMethodNode method)

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

getValueCodegen

public static void getValueCodegen(int column,
                                   CodegenMethodNode method)

isSet

public boolean isSet()

setSet

public void setSet(boolean set)

getFirstValue

public java.lang.Object getFirstValue()

setFirstValue

public void setFirstValue(java.lang.Object firstValue)