org.apache.calcite.plan

Class Contexts

java.lang.Object

org.apache.calcite.plan.Contexts

public class Contexts
extends Object

Utilities for Context.

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.calcite.plan.Contexts.EmptyContext	EMPTY_CONTEXT

Method Summary

Methods

Modifier and Type	Method and Description
static Context	chain(Context... contexts) Returns a context that wraps an object.
static Context	empty() Returns a context that returns null for all inquiries.
static Context	of(Object o) Returns a context that wraps an object.
static Context	withConfig(CalciteConnectionConfig config) Deprecated. Use of(java.lang.Object)

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_CONTEXT

public static final org.apache.calcite.plan.Contexts.EmptyContext EMPTY_CONTEXT

Method Detail

withConfig

@Deprecated
public static Context withConfig(CalciteConnectionConfig config)

Deprecated. Use of(java.lang.Object)

Returns a context that contains a CalciteConnectionConfig.

empty

public static Context empty()

Returns a context that returns null for all inquiries.

of

public static Context of(Object o)

Returns a context that wraps an object.

A call to unwrap(C) will return target if it is an instance of C.

chain

public static Context chain(Context... contexts)

Returns a context that wraps an object.

A call to unwrap(C) will return the first object that is an instance of C.

If any of the contexts is a Context, recursively looks in that object. Thus this method can be used to chain contexts.