org.apache.drill.metastore.rdbms.transform

Class AbstractTransformer<T>

java.lang.Object

org.apache.drill.metastore.rdbms.transform.AbstractTransformer<T>

Type Parameters:

T - Metastore component metadata type

All Implemented Interfaces:

Transformer<T>

Direct Known Subclasses:

TablesTransformer

public abstract class AbstractTransformer<T>
extends Object
implements Transformer<T>

Abstract implementation of Transformer interface which contains common code for all Metastore component metadata types.

Constructor Summary

Constructors

Constructor and Description
AbstractTransformer()

Method Summary

Modifier and Type	Method and Description
List<RdbmsOperation.Delete>	toDelete(Delete delete) Converts Metastore delete operation holder into list of RDBMS Metastore delete operations.
List<RdbmsOperation.Delete>	toDeleteAll() Creates list of RDBMS Metastore delete operations which will delete all data from corresponding Metastore component tables.
protected RdbmsOperation.Overwrite	toOverwrite(String metadataTypeString, List<T> units)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.drill.metastore.rdbms.transform.Transformer

toMapper, toMappers, toOverwrite

Constructor Detail

AbstractTransformer

public AbstractTransformer()

Method Detail

toDelete

public List<RdbmsOperation.Delete> toDelete(Delete delete)

Description copied from interface: Transformer

Converts Metastore delete operation holder into list of RDBMS Metastore delete operations.

Specified by:

toDelete in interface Transformer<T>

Parameters:

delete - Metastore delete operation holder

Returns:

list of RDBMS Metastore delete operations

toDeleteAll

public List<RdbmsOperation.Delete> toDeleteAll()

Description copied from interface: Transformer

Creates list of RDBMS Metastore delete operations which will delete all data from corresponding Metastore component tables.

Specified by:

toDeleteAll in interface Transformer<T>

Returns:

list of RDBMS Metastore delete operations

toOverwrite

protected RdbmsOperation.Overwrite toOverwrite(String metadataTypeString,
                                               List<T> units)