Package org.apache.calcite.rel.metadata

Class ProxyingMetadataHandlerProvider

java.lang.Object

org.apache.calcite.rel.metadata.ProxyingMetadataHandlerProvider

All Implemented Interfaces:

MetadataHandlerProvider

public class ProxyingMetadataHandlerProvider
extends Object
implements MetadataHandlerProvider

A MetadataHandlerProvider built on a RelMetadataProvider.

Uses proxies to call the underlying metadata provider.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.calcite.rel.metadata.MetadataHandlerProvider

MetadataHandlerProvider.NoHandler

Constructor Summary

Constructors

Constructor	Description
ProxyingMetadataHandlerProvider(RelMetadataProvider provider)	Create a proxying handler provider.

Method Summary

Modifier and Type	Method	Description
<MH extends MetadataHandler<?>> MH	handler(Class<MH> handlerClass)	Provide a handler for the requested metadata class.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.calcite.rel.metadata.MetadataHandlerProvider

revise

Constructor Details

ProxyingMetadataHandlerProvider

public ProxyingMetadataHandlerProvider(RelMetadataProvider provider)

Create a proxying handler provider.

Parameters:

provider - The provider this will operate against.

Method Details

handler

public <MH extends MetadataHandler<?>> MH handler(Class<MH> handlerClass)

Description copied from interface: MetadataHandlerProvider

Provide a handler for the requested metadata class.

Specified by:

handler in interface MetadataHandlerProvider

Type Parameters:

MH - The metadata type the handler relates to.

Parameters:

handlerClass - The handler interface expected

Returns:

The handler implementation.