Package org.h2.expression.aggregate

Class AggregateDataCollecting

java.lang.Object

org.h2.expression.aggregate.AggregateData

org.h2.expression.aggregate.AggregateDataCollecting

All Implemented Interfaces:

java.lang.Iterable<Value>

final class AggregateDataCollecting
extends AggregateData
implements java.lang.Iterable<Value>

Data stored while calculating an aggregate that needs collecting of all values or a distinct aggregate.

NULL values are not collected. getValue(SessionLocal) method returns null. Use getArray() for instances of this class instead.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	AggregateDataCollecting.NullCollectionMode	NULL values collection mode.

Field Summary

Fields

Modifier and Type	Field	Description
private boolean	distinct
private AggregateDataCollecting.NullCollectionMode	nullCollectionMode
private boolean	orderedWithOrder
private Value	shared
(package private) java.util.Collection<Value>	values

Constructor Summary

Constructors

Constructor	Description
AggregateDataCollecting(boolean distinct, boolean orderedWithOrder, AggregateDataCollecting.NullCollectionMode nullCollectionMode)	Creates new instance of data for collecting aggregates.

Method Summary

Modifier and Type	Method	Description
(package private) void	add(SessionLocal session, Value v)	Add a value to this aggregate.
(package private) Value[]	getArray()	Returns array with values or null.
(package private) int	getCount()	Returns the count of values.
(package private) Value	getSharedArgument()	Returns value of a shared argument.
(package private) Value	getValue(SessionLocal session)	Get the aggregate result.
private boolean	isNull(Value v)
java.util.Iterator<Value>	iterator()
(package private) void	setSharedArgument(Value shared)	Sets value of a shared argument.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

distinct

private final boolean distinct

orderedWithOrder

private final boolean orderedWithOrder

nullCollectionMode

private final AggregateDataCollecting.NullCollectionMode nullCollectionMode

values

java.util.Collection<Value> values

shared

private Value shared

Constructor Detail

AggregateDataCollecting

AggregateDataCollecting(boolean distinct,
                        boolean orderedWithOrder,
                        AggregateDataCollecting.NullCollectionMode nullCollectionMode)

Creates new instance of data for collecting aggregates.

Parameters:

distinct - if distinct is used

orderedWithOrder - if aggregate is an ordered aggregate with ORDER BY clause

nullCollectionMode - NULL values collection mode

Method Detail

add

void add(SessionLocal session,
         Value v)

Description copied from class: AggregateData

Add a value to this aggregate.

Specified by:

add in class AggregateData

Parameters:

session - the session

v - the value

isNull

private boolean isNull(Value v)

getValue

Value getValue(SessionLocal session)

Description copied from class: AggregateData

Get the aggregate result.

Specified by:

getValue in class AggregateData

Parameters:

session - the session

Returns:

the value

getCount

int getCount()

Returns the count of values.

Returns:

the count of values

getArray

Value[] getArray()

Returns array with values or null.

Returns:

array with values or null

iterator

public java.util.Iterator<Value> iterator()

Specified by:

iterator in interface java.lang.Iterable<Value>

setSharedArgument

void setSharedArgument(Value shared)

Sets value of a shared argument.

Parameters:

shared - the shared value

getSharedArgument

Value getSharedArgument()

Returns value of a shared argument.

Returns:

value of a shared argument