CatalogManager (sql 2.71.0 API)

All Known Implementing Classes:

EmptyCatalogManager, InMemoryCatalogManager
```
@Internal
public interface CatalogManager
```
Top-level authority that manages Catalogs. Used inside the root BeamCalciteSchema.
Implementations should have a way of determining which catalog is currently active, and produce it when currentCatalog() is invoked.
When #registerTableProvider(String, TableProvider) is called, the provider should become available for all catalogs.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.util.Collection<Catalog>`	`catalogs()`
`void`	`createCatalog(java.lang.String name, java.lang.String type, java.util.Map<java.lang.String,java.lang.String> properties)`	Creates and stores a catalog of a particular type.
`Catalog`	`currentCatalog()`	Produces the currently active catalog.
`void`	`dropCatalog(java.lang.String name)`	Drops the catalog with this name.
`@Nullable Catalog`	`getCatalog(java.lang.String name)`	Attempts to fetch the catalog with this name.
`void`	`registerTableProvider(TableProvider tableProvider)`	Registers a `TableProvider` and propagates it to all the `Catalog` instances available to this manager.
`java.util.Map<java.lang.String,TableProvider>`	`tableProviders()`	Returns all the `TableProvider`s available to this `CatalogManager`, organized by type.
`void`	`useCatalog(java.lang.String name)`	Switches the active catalog.

- Method Detail
  - createCatalog
```
void createCatalog(java.lang.String name,
                   java.lang.String type,
                   java.util.Map<java.lang.String,java.lang.String> properties)
```
    Creates and stores a catalog of a particular type.
  - useCatalog
```
void useCatalog(java.lang.String name)
```
    Switches the active catalog.
  - currentCatalog
```
Catalog currentCatalog()
```
    Produces the currently active catalog.
  - getCatalog
```
@Nullable Catalog getCatalog(java.lang.String name)
```
    Attempts to fetch the catalog with this name. May produce null if it does not exist.
  - dropCatalog
```
void dropCatalog(java.lang.String name)
```
    Drops the catalog with this name. No-op if the catalog already does not exist.
  - registerTableProvider
```
void registerTableProvider(TableProvider tableProvider)
```
    Registers a TableProvider and propagates it to all the Catalog instances available to this manager.
  - tableProviders
```
java.util.Map<java.lang.String,TableProvider> tableProviders()
```
    Returns all the TableProviders available to this CatalogManager, organized by type.
  - catalogs
```
java.util.Collection<Catalog> catalogs()
```