org.apache.drill.exec.vector.accessor.writer

Class AbstractScalarWriterImpl.ScalarObjectWriter

java.lang.Object

org.apache.drill.exec.vector.accessor.writer.AbstractObjectWriter

org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriterImpl.ScalarObjectWriter

All Implemented Interfaces:

ColumnWriter, ObjectWriter

Enclosing class:

AbstractScalarWriterImpl

public static class AbstractScalarWriterImpl.ScalarObjectWriter
extends AbstractObjectWriter

Wraps a scalar writer and its event handler to provide a uniform JSON-like interface for all writer types.

The client sees only the scalar writer API. But, internals need visibility into a rather complex set of events to orchestrate vector events: mostly sent to the writer, but some times sent from the writer, such as vector overflow. Separating the two concepts makes it easier to add type-conversion shims on top of the actual vector writer.

Constructor Summary

Constructors

Constructor and Description
ScalarObjectWriter(AbstractScalarWriterImpl baseWriter)

Method Summary

Modifier and Type	Method and Description
void	dump(HierarchicalFormatter format)
WriterEvents	events() The internal state behind this writer.
ScalarWriter	scalar()
ColumnWriter	writer() Generic version of the above, for dynamic handling of writers.

Methods inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractObjectWriter

array, copy, dict, isProjected, nullable, schema, setNull, setObject, toString, tuple, type, variant

Methods inherited from class java.lang.Object

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

Constructor Detail

ScalarObjectWriter

public ScalarObjectWriter(AbstractScalarWriterImpl baseWriter)

Method Detail

scalar

public ScalarWriter scalar()

Specified by:

scalar in interface ObjectWriter

Overrides:

scalar in class AbstractObjectWriter

writer

public ColumnWriter writer()

Description copied from interface: ObjectWriter

Generic version of the above, for dynamic handling of writers.

Returns:

the generic form of the column writer

events

public WriterEvents events()

Description copied from interface: ObjectWriter

The internal state behind this writer. To be used only by the implementation, not by the client.

Specified by:

events in interface ObjectWriter

Specified by:

events in class AbstractObjectWriter

dump

public void dump(HierarchicalFormatter format)

Specified by:

dump in class AbstractObjectWriter