Module xl.core

Package de.grogra.xl.util

Class AggregateStateImpl<T>

java.lang.Object

de.grogra.xl.util.AggregateStateImpl<T>

All Implemented Interfaces:

AggregateState, BooleanAggregateState, ByteAggregateState, CharAggregateState, DoubleAggregateState, FloatAggregateState, IntAggregateState, LongAggregateState, ObjectAggregateState<T>, ShortAggregateState

public final class AggregateStateImpl<T>
extends Object
implements BooleanAggregateState, ByteAggregateState, ShortAggregateState, CharAggregateState, IntAggregateState, LongAggregateState, FloatAggregateState, DoubleAggregateState, ObjectAggregateState<T>

Utility class which implements all AggregateState interfaces and provides some general fields for storing state. Instances of this class are pooled so that heap traffic is reduced.

Author:

Ole Kniemeyer

Field Summary

Fields

Modifier and Type	Field	Description
T	aval	This field contains the result if the type is a reference type.
Object	aval1	This field may be used freely by aggregate methods.
Object	aval2	This field may be used freely by aggregate methods.
Object	aval3	This field may be used freely by aggregate methods.
Object	aval4	This field may be used freely by aggregate methods.
double	dval	This field contains the result if the type is double.
double	dval1	This field may be used freely by aggregate methods.
double	dval2	This field may be used freely by aggregate methods.
double	dval3	This field may be used freely by aggregate methods.
double	dval4	This field may be used freely by aggregate methods.
float	fval	This field contains the result if the type is float.
float	fval1	This field may be used freely by aggregate methods.
float	fval2	This field may be used freely by aggregate methods.
float	fval3	This field may be used freely by aggregate methods.
float	fval4	This field may be used freely by aggregate methods.
int	ival	This field contains the result if the type is boolean, byte, short, char, or int.
int	ival1	This field may be used freely by aggregate methods.
int	ival2	This field may be used freely by aggregate methods.
int	ival3	This field may be used freely by aggregate methods.
int	ival4	This field may be used freely by aggregate methods.
long	lval	This field contains the result if the type is long.
long	lval1	This field may be used freely by aggregate methods.
long	lval2	This field may be used freely by aggregate methods.
long	lval3	This field may be used freely by aggregate methods.
long	lval4	This field may be used freely by aggregate methods.

Method Summary

Modifier and Type	Method	Description
static AggregateStateImpl<?>	allocate()
boolean	getBooleanResult()	Returns the result of the aggregation.
byte	getByteResult()	Returns the result of the aggregation.
char	getCharResult()	Returns the result of the aggregation.
double	getDoubleResult()	Returns the result of the aggregation.
float	getFloatResult()	Returns the result of the aggregation.
int	getIntResult()	Returns the result of the aggregation.
long	getLongResult()	Returns the result of the aggregation.
T	getObjectResult()	Returns the result of the aggregation.
short	getShortResult()	Returns the result of the aggregation.
boolean	isFinished()	Returns true to indicate the invoker of the aggregate method that the computation of the aggregate value has been completed by the aggregate method, even if there are values left for aggregation.
void	setFinished()	Sets the finished-flag to true.

Methods inherited from class java.lang.Object

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

Field Details

ival

public int ival

This field contains the result if the type is boolean, byte, short, char, or int.

lval

public long lval

This field contains the result if the type is long.

fval

public float fval

This field contains the result if the type is float.

dval

public double dval

This field contains the result if the type is double.

aval

public T aval

This field contains the result if the type is a reference type.

ival1

public int ival1

This field may be used freely by aggregate methods.

ival2

public int ival2

This field may be used freely by aggregate methods.

ival3

public int ival3

This field may be used freely by aggregate methods.

ival4

public int ival4

This field may be used freely by aggregate methods.

lval1

public long lval1

This field may be used freely by aggregate methods.

lval2

public long lval2

This field may be used freely by aggregate methods.

lval3

public long lval3

This field may be used freely by aggregate methods.

lval4

public long lval4

This field may be used freely by aggregate methods.

fval1

public float fval1

This field may be used freely by aggregate methods.

fval2

public float fval2

This field may be used freely by aggregate methods.

fval3

public float fval3

This field may be used freely by aggregate methods.

fval4

public float fval4

This field may be used freely by aggregate methods.

dval1

public double dval1

This field may be used freely by aggregate methods.

dval2

public double dval2

This field may be used freely by aggregate methods.

dval3

public double dval3

This field may be used freely by aggregate methods.

dval4

public double dval4

This field may be used freely by aggregate methods.

aval1

public Object aval1

This field may be used freely by aggregate methods.

aval2

public Object aval2

This field may be used freely by aggregate methods.

aval3

public Object aval3

This field may be used freely by aggregate methods.

aval4

public Object aval4

This field may be used freely by aggregate methods.

Method Details

allocate

public static AggregateStateImpl<?> allocate()

getBooleanResult

public boolean getBooleanResult()

Description copied from interface: BooleanAggregateState

Returns the result of the aggregation. This is only valid after the aggregate method has been invoked for a last time with its finished argument set to true.

Specified by:

getBooleanResult in interface BooleanAggregateState

Returns:

aggregated value

getByteResult

public byte getByteResult()

Description copied from interface: ByteAggregateState

Returns the result of the aggregation. This is only valid after the aggregate method has been invoked for a last time with its finished argument set to true.

Specified by:

getByteResult in interface ByteAggregateState

Returns:

aggregated value

getShortResult

public short getShortResult()

Description copied from interface: ShortAggregateState

Returns the result of the aggregation. This is only valid after the aggregate method has been invoked for a last time with its finished argument set to true.

Specified by:

getShortResult in interface ShortAggregateState

Returns:

aggregated value

getCharResult

public char getCharResult()

Description copied from interface: CharAggregateState

Returns the result of the aggregation. This is only valid after the aggregate method has been invoked for a last time with its finished argument set to true.

Specified by:

getCharResult in interface CharAggregateState

Returns:

aggregated value

getIntResult

public int getIntResult()

Description copied from interface: IntAggregateState

Returns the result of the aggregation. This is only valid after the aggregate method has been invoked for a last time with its finished argument set to true.

Specified by:

getIntResult in interface IntAggregateState

Returns:

aggregated value

getLongResult

public long getLongResult()

Description copied from interface: LongAggregateState

Returns the result of the aggregation. This is only valid after the aggregate method has been invoked for a last time with its finished argument set to true.

Specified by:

getLongResult in interface LongAggregateState

Returns:

aggregated value

getFloatResult

public float getFloatResult()

Description copied from interface: FloatAggregateState

Returns the result of the aggregation. This is only valid after the aggregate method has been invoked for a last time with its finished argument set to true.

Specified by:

getFloatResult in interface FloatAggregateState

Returns:

aggregated value

getDoubleResult

public double getDoubleResult()

Description copied from interface: DoubleAggregateState

Returns the result of the aggregation. This is only valid after the aggregate method has been invoked for a last time with its finished argument set to true.

Specified by:

getDoubleResult in interface DoubleAggregateState

Returns:

aggregated value

getObjectResult

public T getObjectResult()

Description copied from interface: ObjectAggregateState

Returns the result of the aggregation. This is only valid after the aggregate method has been invoked for a last time with its finished argument set to true.

Specified by:

getObjectResult in interface ObjectAggregateState<T>

Returns:

aggregated value

setFinished

public void setFinished()

Sets the finished-flag to true. Subsequent invocations of isFinished() will return true.

isFinished

public boolean isFinished()

Description copied from interface: AggregateState

Returns true to indicate the invoker of the aggregate method that the computation of the aggregate value has been completed by the aggregate method, even if there are values left for aggregation. E.g., this is the case for a short circuit implementation of the boolean or where the result is known when the first true-value is encountered. The invoker must not invoke the aggregate method again.

Specified by:

isFinished in interface AggregateState

Returns:

true iff the final aggregated value is already known