org.apache.drill.metastore.rdbms.transform

Class AbstractMetadataMapper<U,R extends org.jooq.Record>

java.lang.Object

org.apache.drill.metastore.rdbms.transform.AbstractMetadataMapper<U,R>

Type Parameters:

U - Metastore component metadata type

R - RDBMS table record type

All Implemented Interfaces:

MetadataMapper<U,R>

Direct Known Subclasses:

TablesMetadataMapper

public abstract class AbstractMetadataMapper<U,R extends org.jooq.Record>
extends Object
implements MetadataMapper<U,R>

Abstract implementation of MetadataMapper interface which contains common code for all Metastore component metadata and RDBMS table types.

Constructor Summary

Constructors

Constructor and Description
AbstractMetadataMapper()

Method Summary

Modifier and Type	Method and Description
protected abstract Map<MetastoreColumn,org.jooq.Field<?>>	fieldMapper()
protected abstract RdbmsFilterExpressionVisitor	filterVisitor()
org.jooq.Condition	toCondition(FilterExpression filter) Converts Metastore filter expression into JOOQ condition instance which will be used as where clause in SQL query.
List<org.jooq.Field<?>>	toFields(List<MetastoreColumn> columns) Matches given list of Metastore columns to the available RDBMS table columns.

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.MetadataMapper

emptyUnit, table, toDeleteConditions, toRecord, toUnit

Constructor Detail

AbstractMetadataMapper

public AbstractMetadataMapper()

Method Detail

toFields

public List<org.jooq.Field<?>> toFields(List<MetastoreColumn> columns)

Description copied from interface: MetadataMapper

Matches given list of Metastore columns to the available RDBMS table columns.

Specified by:

toFields in interface MetadataMapper<U,R extends org.jooq.Record>

Parameters:

columns - list of Metastore columns

Returns:

list of RDBMS table fields

toCondition

public org.jooq.Condition toCondition(FilterExpression filter)

Description copied from interface: MetadataMapper

Converts Metastore filter expression into JOOQ condition instance which will be used as where clause in SQL query.

Specified by:

toCondition in interface MetadataMapper<U,R extends org.jooq.Record>

Parameters:

filter - filter expression

Returns:

JOOQ condition instance

fieldMapper

protected abstract Map<MetastoreColumn,org.jooq.Field<?>> fieldMapper()

Returns:

mapper specific field mapper

filterVisitor

protected abstract RdbmsFilterExpressionVisitor filterVisitor()

Returns:

mapper specific filter visitor