Package org.apache.druid.catalog

Class NullMetadataCatalog

java.lang.Object

org.apache.druid.catalog.NullMetadataCatalog

All Implemented Interfaces:

MetadataCatalog

public class NullMetadataCatalog
extends Object
implements MetadataCatalog

Field Summary

Fields

Modifier and Type	Field	Description
static final MetadataCatalog	INSTANCE

Constructor Summary

Constructors

Constructor	Description
NullMetadataCatalog()

Method Summary

Modifier and Type	Method	Description
TableMetadata	getTable(TableId tableId)	Resolves a table given a TableId with the schema and table name.
ResolvedTable	resolveTable(TableId tableId)
Set<String>	tableNames(String schemaName)
List<TableMetadata>	tables(String schemaName)	List of tables defined within the given schema.

Methods inherited from class java.lang.Object

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

Field Details

INSTANCE

public static final MetadataCatalog INSTANCE

Constructor Details

NullMetadataCatalog

public NullMetadataCatalog()

Method Details

getTable

@Nullable
public TableMetadata getTable(TableId tableId)

Description copied from interface: MetadataCatalog

Resolves a table given a TableId with the schema and table name. Does not do security checks: the caller is responsible.

Specified by:

getTable in interface MetadataCatalog

Returns:

the table metadata, if any exists, else null if no metadata is available. Note that a datasource can exist without metadata. Views and input sources exist only if their metadata exists. System tables never have metadata.

resolveTable

@Nullable
public ResolvedTable resolveTable(TableId tableId)

Specified by:

resolveTable in interface MetadataCatalog

tables

public List<TableMetadata> tables(String schemaName)

Description copied from interface: MetadataCatalog

List of tables defined within the given schema. Does not filter the tables by permissions: the caller is responsible for that.

Specified by:

tables in interface MetadataCatalog

Returns:

tableNames

public Set<String> tableNames(String schemaName)

Specified by:

tableNames in interface MetadataCatalog