org.apache.parquet.hadoop.api

Class DelegatingWriteSupport<T>

java.lang.Object

org.apache.parquet.hadoop.api.WriteSupport<T>

org.apache.parquet.hadoop.api.DelegatingWriteSupport<T>

Type Parameters:

T - the Java class of objects written with this WriteSupport

public class DelegatingWriteSupport<T>
extends WriteSupport<T>

Helps composing write supports

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.parquet.hadoop.api.WriteSupport

WriteSupport.FinalizedWriteContext, WriteSupport.WriteContext

Constructor Summary

Constructors

Constructor and Description
DelegatingWriteSupport(WriteSupport<T> delegate)

Method Summary

Modifier and Type	Method and Description
WriteSupport.FinalizedWriteContext	finalizeWrite() called once in the end after the last record was written
String	getName() Called to get a name to identify the WriteSupport object model.
WriteSupport.WriteContext	init(org.apache.hadoop.conf.Configuration configuration) called first in the task
void	prepareForWrite(RecordConsumer recordConsumer) This will be called once per row group
String	toString()
void	write(T record) called once per record

Methods inherited from class java.lang.Object

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

Constructor Detail

DelegatingWriteSupport

public DelegatingWriteSupport(WriteSupport<T> delegate)

Method Detail

init

public WriteSupport.WriteContext init(org.apache.hadoop.conf.Configuration configuration)

Description copied from class: WriteSupport

called first in the task

Specified by:

init in class WriteSupport<T>

Parameters:

configuration - the job's configuration

Returns:

the information needed to write the file

prepareForWrite

public void prepareForWrite(RecordConsumer recordConsumer)

Description copied from class: WriteSupport

This will be called once per row group

Specified by:

prepareForWrite in class WriteSupport<T>

Parameters:

recordConsumer - the recordConsumer to write to

write

public void write(T record)

Description copied from class: WriteSupport

called once per record

Specified by:

write in class WriteSupport<T>

Parameters:

record - one record to write to the previously provided record consumer

getName

public String getName()

Description copied from class: WriteSupport

Called to get a name to identify the WriteSupport object model. If not null, this is added to the file footer metadata.

Defining this method will be required in a future API version.

Overrides:

getName in class WriteSupport<T>

Returns:

a String name for file metadata.

finalizeWrite

public WriteSupport.FinalizedWriteContext finalizeWrite()

Description copied from class: WriteSupport

called once in the end after the last record was written

Overrides:

finalizeWrite in class WriteSupport<T>

Returns:

information to be added in the file

toString

public String toString()

Overrides:

toString in class Object