Package org.apache.druid.segment

Class ObjectColumnSelector<T>

java.lang.Object

org.apache.druid.segment.ObjectColumnSelector<T>

All Implemented Interfaces:

HotLoopCallee, BaseDoubleColumnValueSelector, BaseFloatColumnValueSelector, BaseLongColumnValueSelector, BaseNullableColumnValueSelector, BaseObjectColumnValueSelector<T>, ColumnValueSelector<T>

Direct Known Subclasses:

ObjectAggregateCombiner, SettableObjectColumnValueSelector, ShimObjectColumnValueSelector

public abstract class ObjectColumnSelector<T>
extends Object
implements ColumnValueSelector<T>

Restricts selector usage to only allow BaseObjectColumnValueSelector.getObject(). This class is convenient for implementation of "object-sourcing" ColumnValueSelectors. This class should appear ONLY in "extends" clause or anonymous class creation, but NOT in "user" code, where BaseObjectColumnValueSelector must be used instead.

Field Summary

Fields inherited from interface org.apache.druid.segment.ColumnValueSelector

EMPTY_ARRAY

Constructor Summary

Constructors

Constructor	Description
ObjectColumnSelector()

Method Summary

Modifier and Type	Method	Description
final double	getDouble()
final float	getFloat()
final long	getLong()
final boolean	isNull()	Returns true if the primitive long, double, or float value returned by this selector should be treated as null.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.segment.BaseObjectColumnValueSelector

classOfObject, getObject

Methods inherited from interface org.apache.druid.query.monomorphicprocessing.HotLoopCallee

inspectRuntimeShape

Constructor Details

ObjectColumnSelector

public ObjectColumnSelector()

Method Details

getFloat

public final float getFloat()

Specified by:

getFloat in interface BaseFloatColumnValueSelector

getDouble

public final double getDouble()

Specified by:

getDouble in interface BaseDoubleColumnValueSelector

getLong

public final long getLong()

Specified by:

getLong in interface BaseLongColumnValueSelector

isNull

public final boolean isNull()

Description copied from interface: BaseNullableColumnValueSelector

Returns true if the primitive long, double, or float value returned by this selector should be treated as null. Users of BaseLongColumnValueSelector.getLong(), BaseDoubleColumnValueSelector.getDouble() and BaseFloatColumnValueSelector.getFloat() must check this method first, or else they may improperly use placeholder values returned by the primitive get methods. Users of BaseObjectColumnValueSelector.getObject() should not call this method. Instead, call "getObject" and check if it is null.

Specified by:

isNull in interface BaseNullableColumnValueSelector