org.apache.iceberg.inmemory

Class InMemoryCatalog

java.lang.Object

org.apache.iceberg.BaseMetastoreCatalog

org.apache.iceberg.inmemory.InMemoryCatalog

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, Catalog, SupportsNamespaces

public class InMemoryCatalog
extends BaseMetastoreCatalog
implements SupportsNamespaces, java.io.Closeable

Catalog implementation that uses in-memory data-structures to store the namespaces and tables. This class doesn't touch external resources and can be utilized to write unit tests without side effects. It uses InMemoryFileIO.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.iceberg.BaseMetastoreCatalog

BaseMetastoreCatalog.BaseMetastoreCatalogTableBuilder

Nested classes/interfaces inherited from interface org.apache.iceberg.catalog.Catalog

Catalog.TableBuilder

Constructor Summary

Constructors

Constructor and Description
InMemoryCatalog()

Method Summary

Modifier and Type	Method and Description
void	close()
void	createNamespace(Namespace namespace) Create a namespace in the catalog.
void	createNamespace(Namespace namespace, java.util.Map<java.lang.String,java.lang.String> metadata) Create a namespace in the catalog.
protected java.lang.String	defaultWarehouseLocation(TableIdentifier tableIdentifier)
boolean	dropNamespace(Namespace namespace) Drop a namespace.
boolean	dropTable(TableIdentifier tableIdentifier, boolean purge) Drop a table; optionally delete data and metadata files.
void	initialize(java.lang.String name, java.util.Map<java.lang.String,java.lang.String> properties) Initialize a catalog given a custom name and a map of catalog properties.
java.util.List<Namespace>	listNamespaces() List top-level namespaces from the catalog.
java.util.List<Namespace>	listNamespaces(Namespace namespace) List namespaces from the namespace.
java.util.List<TableIdentifier>	listTables(Namespace namespace) Return all the identifiers under this namespace.
java.util.Map<java.lang.String,java.lang.String>	loadNamespaceMetadata(Namespace namespace) Load metadata properties for a namespace.
java.lang.String	name() Return the name for this catalog.
boolean	namespaceExists(Namespace namespace) Checks whether the Namespace exists.
protected TableOperations	newTableOps(TableIdentifier tableIdentifier)
boolean	removeProperties(Namespace namespace, java.util.Set<java.lang.String> properties) Remove a set of property keys from a namespace in the catalog.
void	renameTable(TableIdentifier fromTableIdentifier, TableIdentifier toTableIdentifier) Rename a table.
boolean	setProperties(Namespace namespace, java.util.Map<java.lang.String,java.lang.String> properties) Set a collection of properties on a namespace in the catalog.

Methods inherited from class org.apache.iceberg.BaseMetastoreCatalog

buildTable, fullTableName, isValidIdentifier, loadTable, properties, registerTable, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.iceberg.catalog.Catalog

createTable, createTable, createTable, createTable, dropTable, invalidateTable, newCreateTableTransaction, newCreateTableTransaction, newCreateTableTransaction, newCreateTableTransaction, newReplaceTableTransaction, newReplaceTableTransaction, newReplaceTableTransaction, newReplaceTableTransaction, tableExists

Constructor Detail

InMemoryCatalog

public InMemoryCatalog()

Method Detail

name

public java.lang.String name()

Description copied from interface: Catalog

Return the name for this catalog.

Specified by:

name in interface Catalog

Returns:

this catalog's name

initialize

public void initialize(java.lang.String name,
                       java.util.Map<java.lang.String,java.lang.String> properties)

Description copied from interface: Catalog

Initialize a catalog given a custom name and a map of catalog properties.

A custom Catalog implementation must have a no-arg constructor. A compute engine like Spark or Flink will first initialize the catalog without any arguments, and then call this method to complete catalog initialization with properties passed into the engine.

Specified by:

initialize in interface Catalog

Parameters:

name - a custom name for the catalog

properties - catalog properties

newTableOps

protected TableOperations newTableOps(TableIdentifier tableIdentifier)

Specified by:

newTableOps in class BaseMetastoreCatalog

defaultWarehouseLocation

protected java.lang.String defaultWarehouseLocation(TableIdentifier tableIdentifier)

Specified by:

defaultWarehouseLocation in class BaseMetastoreCatalog

dropTable

public boolean dropTable(TableIdentifier tableIdentifier,
                         boolean purge)

Description copied from interface: Catalog

Drop a table; optionally delete data and metadata files.

If purge is set to true the implementation should delete all data and metadata files.

Specified by:

dropTable in interface Catalog

Parameters:

tableIdentifier - a table identifier

purge - if true, delete all data and metadata files in the table

Returns:

true if the table was dropped, false if the table did not exist

listTables

public java.util.List<TableIdentifier> listTables(Namespace namespace)

Description copied from interface: Catalog

Return all the identifiers under this namespace.

Specified by:

listTables in interface Catalog

Parameters:

namespace - a namespace

Returns:

a list of identifiers for tables

renameTable

public void renameTable(TableIdentifier fromTableIdentifier,
                        TableIdentifier toTableIdentifier)

Description copied from interface: Catalog

Rename a table.

Specified by:

renameTable in interface Catalog

Parameters:

fromTableIdentifier - identifier of the table to rename

toTableIdentifier - new table name

createNamespace

public void createNamespace(Namespace namespace)

Description copied from interface: SupportsNamespaces

Create a namespace in the catalog.

Specified by:

createNamespace in interface SupportsNamespaces

Parameters:

namespace - a namespace. Namespace.

createNamespace

public void createNamespace(Namespace namespace,
                            java.util.Map<java.lang.String,java.lang.String> metadata)

Description copied from interface: SupportsNamespaces

Create a namespace in the catalog.

Specified by:

createNamespace in interface SupportsNamespaces

Parameters:

namespace - a multi-part namespace

metadata - a string Map of properties for the given namespace

namespaceExists

public boolean namespaceExists(Namespace namespace)

Description copied from interface: SupportsNamespaces

Checks whether the Namespace exists.

Specified by:

namespaceExists in interface SupportsNamespaces

Parameters:

namespace - a namespace. Namespace

Returns:

true if the Namespace exists, false otherwise

dropNamespace

public boolean dropNamespace(Namespace namespace)
                      throws NamespaceNotEmptyException

Description copied from interface: SupportsNamespaces

Drop a namespace. If the namespace exists and was dropped, this will return true.

Specified by:

dropNamespace in interface SupportsNamespaces

Parameters:

namespace - a namespace. Namespace

Returns:

true if the namespace was dropped, false otherwise.

Throws:

NamespaceNotEmptyException - If the namespace is not empty

setProperties

public boolean setProperties(Namespace namespace,
                             java.util.Map<java.lang.String,java.lang.String> properties)
                      throws NoSuchNamespaceException

Description copied from interface: SupportsNamespaces

Set a collection of properties on a namespace in the catalog.

Properties that are not in the given map are not modified or removed by this method.

Specified by:

setProperties in interface SupportsNamespaces

Parameters:

namespace - a namespace. Namespace

properties - a collection of metadata to apply to the namespace

Throws:

NoSuchNamespaceException - If the namespace does not exist (optional)

removeProperties

public boolean removeProperties(Namespace namespace,
                                java.util.Set<java.lang.String> properties)
                         throws NoSuchNamespaceException

Description copied from interface: SupportsNamespaces

Remove a set of property keys from a namespace in the catalog.

Properties that are not in the given set are not modified or removed by this method.

Specified by:

removeProperties in interface SupportsNamespaces

Parameters:

namespace - a namespace. Namespace

properties - a collection of metadata to apply to the namespace

Throws:

NoSuchNamespaceException - If the namespace does not exist (optional)

loadNamespaceMetadata

public java.util.Map<java.lang.String,java.lang.String> loadNamespaceMetadata(Namespace namespace)
                                                                       throws NoSuchNamespaceException

Description copied from interface: SupportsNamespaces

Load metadata properties for a namespace.

Specified by:

loadNamespaceMetadata in interface SupportsNamespaces

Parameters:

namespace - a namespace. Namespace

Returns:

a string map of properties for the given namespace

Throws:

NoSuchNamespaceException - If the namespace does not exist (optional)

listNamespaces

public java.util.List<Namespace> listNamespaces()

Description copied from interface: SupportsNamespaces

List top-level namespaces from the catalog.

If an object such as a table, view, or function exists, its parent namespaces must also exist and must be returned by this discovery method. For example, if table a.b.t exists, this method must return ["a"] in the result array.

Specified by:

listNamespaces in interface SupportsNamespaces

Returns:

an List of namespace Namespace names

listNamespaces

public java.util.List<Namespace> listNamespaces(Namespace namespace)
                                         throws NoSuchNamespaceException

Description copied from interface: SupportsNamespaces

List namespaces from the namespace.

For example, if table a.b.t exists, use 'SELECT NAMESPACE IN a' this method must return Namepace.of("a","b") Namespace.

Specified by:

listNamespaces in interface SupportsNamespaces

Returns:

a List of namespace Namespace names

Throws:

NoSuchNamespaceException - If the namespace does not exist (optional)

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Throws:

java.io.IOException