org.apache.drill.metastore.rdbms.transform

Interface Transformer<T>

Type Parameters:

T - Metastore component metadata type

All Known Implementing Classes:

AbstractTransformer, TablesTransformer

public interface Transformer<T>

Provides various methods for RDBMS Metastore data, filters, operations transformation.

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.
MetadataMapper<T,? extends org.jooq.Record>	toMapper(MetadataType metadataType) Returns metadata mappers corresponding to the given metadata type.
Set<MetadataMapper<T,? extends org.jooq.Record>>	toMappers(Set<MetadataType> metadataTypes) Returns set of metadata mappers corresponding to the given metadata types.
List<RdbmsOperation.Overwrite>	toOverwrite(List<T> units) Converts given list of Metastore component metadata units into RDBMS Metastore overwrite operations.

Method Detail

toMappers

Set<MetadataMapper<T,? extends org.jooq.Record>> toMappers(Set<MetadataType> metadataTypes)

Returns set of metadata mappers corresponding to the given metadata types.

Parameters:

metadataTypes - set of metadata types

Returns:

set of metadata mappers

toMapper

MetadataMapper<T,? extends org.jooq.Record> toMapper(MetadataType metadataType)

Returns metadata mappers corresponding to the given metadata type.

Parameters:

metadataType - metadata type

Returns:

metadata mapper

toOverwrite

List<RdbmsOperation.Overwrite> toOverwrite(List<T> units)

Converts given list of Metastore component metadata units into RDBMS Metastore overwrite operations.

Parameters:

units - Metastore metadata units

Returns:

list of RDBMS Metastore overwrite operations

toDelete

List<RdbmsOperation.Delete> toDelete(Delete delete)

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

Parameters:

delete - Metastore delete operation holder

Returns:

list of RDBMS Metastore delete operations

toDeleteAll

List<RdbmsOperation.Delete> toDeleteAll()

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

Returns:

list of RDBMS Metastore delete operations