Interface SupportsNamespaces
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- All Known Implementing Classes:
DynamoDbCatalog
,GlueCatalog
,HadoopCatalog
,HiveCatalog
,JdbcCatalog
,NessieCatalog
public interface SupportsNamespaces
Catalog methods for working with namespaces.If an object such as a table, view, or function exists, its parent namespaces must also exist and must be returned by the discovery methods
listNamespaces()
andlistNamespaces(Namespace namespace)
.Catalog implementations are not required to maintain the existence of namespaces independent of objects in a namespace. For example, a function catalog that loads functions using reflection and uses Java packages as namespaces is not required to support the methods to create, alter, or drop a namespace. Implementations are allowed to discover the existence of objects or namespaces without throwing
NoSuchNamespaceException
when no namespace is found.
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Method Summary
All Methods Instance Methods Abstract Methods Default Methods Modifier and Type Method Description default 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.boolean
dropNamespace(Namespace namespace)
Drop a namespace.default 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.Map<java.lang.String,java.lang.String>
loadNamespaceMetadata(Namespace namespace)
Load metadata properties for a namespace.default boolean
namespaceExists(Namespace namespace)
Checks whether the Namespace exists.boolean
removeProperties(Namespace namespace, java.util.Set<java.lang.String> properties)
Remove a set of property keys from a namespace in the catalog.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.
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Method Detail
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createNamespace
default void createNamespace(Namespace namespace)
Create a namespace in the catalog.- Parameters:
namespace
- a namespace.Namespace
.- Throws:
AlreadyExistsException
- If the namespace already existsjava.lang.UnsupportedOperationException
- If create is not a supported operation
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createNamespace
void createNamespace(Namespace namespace, java.util.Map<java.lang.String,java.lang.String> metadata)
Create a namespace in the catalog.- Parameters:
namespace
- a multi-part namespacemetadata
- a string Map of properties for the given namespace- Throws:
AlreadyExistsException
- If the namespace already existsjava.lang.UnsupportedOperationException
- If create is not a supported operation
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listNamespaces
default java.util.List<Namespace> listNamespaces()
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.
- Returns:
- an List of namespace
Namespace
names
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listNamespaces
java.util.List<Namespace> listNamespaces(Namespace namespace) throws NoSuchNamespaceException
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
.- Returns:
- a List of namespace
Namespace
names - Throws:
NoSuchNamespaceException
- If the namespace does not exist (optional)
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loadNamespaceMetadata
java.util.Map<java.lang.String,java.lang.String> loadNamespaceMetadata(Namespace namespace) throws NoSuchNamespaceException
Load metadata properties for a namespace.- Parameters:
namespace
- a namespace.Namespace
- Returns:
- a string map of properties for the given namespace
- Throws:
NoSuchNamespaceException
- If the namespace does not exist (optional)
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dropNamespace
boolean dropNamespace(Namespace namespace) throws NamespaceNotEmptyException
Drop a namespace. If the namespace exists and was dropped, this will return true.- Parameters:
namespace
- a namespace.Namespace
- Returns:
- true if the namespace was dropped, false otherwise.
- Throws:
NamespaceNotEmptyException
- If the namespace is not empty
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setProperties
boolean setProperties(Namespace namespace, java.util.Map<java.lang.String,java.lang.String> properties) throws NoSuchNamespaceException
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.
- Parameters:
namespace
- a namespace.Namespace
properties
- a collection of metadata to apply to the namespace- Throws:
NoSuchNamespaceException
- If the namespace does not exist (optional)java.lang.UnsupportedOperationException
- If namespace properties are not supported
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removeProperties
boolean removeProperties(Namespace namespace, java.util.Set<java.lang.String> properties) throws NoSuchNamespaceException
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.
- Parameters:
namespace
- a namespace.Namespace
properties
- a collection of metadata to apply to the namespace- Throws:
NoSuchNamespaceException
- If the namespace does not exist (optional)java.lang.UnsupportedOperationException
- If namespace properties are not supported
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