Package org.apache.druid.segment.selector.settable

Class SettableObjectColumnValueSelector<T>

java.lang.Object

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

org.apache.druid.segment.selector.settable.SettableObjectColumnValueSelector<T>

All Implemented Interfaces:

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

public class SettableObjectColumnValueSelector<T>
extends ObjectColumnSelector<T>
implements SettableColumnValueSelector<T>

Field Summary

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

EMPTY_ARRAY

Constructor Summary

Constructors

Constructor	Description
SettableObjectColumnValueSelector()

Method Summary

Modifier and Type	Method	Description
Class<T>	classOfObject()	Most-specific class of object returned by BaseObjectColumnValueSelector.getObject(), if known in advance.
T	getObject()	Returns the currently-selected object.
void	setValueFrom(ColumnValueSelector selector)

Methods inherited from class org.apache.druid.segment.ObjectColumnSelector

getDouble, getFloat, getLong, isNull

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.BaseDoubleColumnValueSelector

getDouble

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

getFloat

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

getLong

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

isNull

Methods inherited from interface org.apache.druid.segment.selector.settable.SettableColumnValueSelector

inspectRuntimeShape

Constructor Detail

SettableObjectColumnValueSelector

public SettableObjectColumnValueSelector()

Method Detail

setValueFrom

public void setValueFrom(ColumnValueSelector selector)

Specified by:

setValueFrom in interface SettableColumnValueSelector<T>

getObject

@Nullable
public T getObject()

Description copied from interface: BaseObjectColumnValueSelector

Returns the currently-selected object. The behavior of this method depends on the type of selector, which can be determined by calling ColumnSelectorFactory.getColumnCapabilities(String) on the same ColumnSelectorFactory that you got this selector from. If the capabilties are nonnull, the selector type is given by TypeSignature.getType(). String selectors, where type is ColumnType.STRING, may return any type of object from this method, especially in cases where the selector is casting objects to string at selection time. Callers are encouraged to avoid the need to deal with various objects by using ColumnSelectorFactory.makeDimensionSelector(org.apache.druid.query.dimension.DimensionSpec) instead. Numeric selectors, where TypeSignature.isNumeric(), may return any type of Number. Callers that wish to deal with more specific types should treat the original ColumnValueSelector as a BaseLongColumnValueSelector, BaseDoubleColumnValueSelector, or BaseFloatColumnValueSelector instead. Array selectors, where TypeSignature.isArray(), must return Object[]. The array may contain null elements, and the array itself may also be null. Selectors of unknown type, where ColumnSelectorFactory.getColumnCapabilities(String) returns null, may return any type of object. Callers must be prepared for a wide variety of possible input objects. This case is common during ingestion, where selectors are built on top of external data.

Specified by:

getObject in interface BaseObjectColumnValueSelector<T>

classOfObject

public Class<T> classOfObject()

Description copied from interface: BaseObjectColumnValueSelector

Most-specific class of object returned by BaseObjectColumnValueSelector.getObject(), if known in advance. This method returns Object when selectors do not know in advance what class of object they may return.

Specified by:

classOfObject in interface BaseObjectColumnValueSelector<T>