Package io.deephaven.api.agg.spec

Class AggSpecFreeze

java.lang.Object

io.deephaven.api.agg.spec.AggSpecBase

io.deephaven.api.agg.spec.AggSpecEmptyBase

io.deephaven.api.agg.spec.AggSpecFreeze

All Implemented Interfaces:

AggSpec

@Immutable
public abstract class AggSpecFreeze
extends AggSpecEmptyBase

Specifies an aggregation that freezes the first value for each group and ignores subsequent changes. When groups are removed, the corresponding output row is removed. When groups are re-added (on a subsequent update cycle), the newly added value is then frozen.

ImplNote:

Only one row per group is allowed in the output, because the operation has no way to determine which row to freeze otherwise. This is a constraint on the input data.

Nested Class Summary

Nested classes/interfaces inherited from interface io.deephaven.api.agg.spec.AggSpec

AggSpec.Visitor

Constructor Summary

Constructors

Constructor	Description
AggSpecFreeze()

Method Summary

Modifier and Type	Method	Description
final String	description()	Get a simple description for this AggSpec.
static AggSpecFreeze	of()
final <V extends AggSpec.Visitor> V	walk(V visitor)	Glue method to deliver this AggSpec to a AggSpec.Visitor.

Methods inherited from class io.deephaven.api.agg.spec.AggSpecBase

aggregation, aggregation, aggregation

Methods inherited from class java.lang.Object

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

Constructor Details

AggSpecFreeze

public AggSpecFreeze()

Method Details

of

public static AggSpecFreeze of()

description

public final String description()

Description copied from interface: AggSpec

Get a simple description for this AggSpec.

Returns:

The description

walk

public final <V extends AggSpec.Visitor> V walk(V visitor)

Description copied from interface: AggSpec

Glue method to deliver this AggSpec to a AggSpec.Visitor.

Parameters:

visitor - The visitor

Returns:

The visitor