org.apache.calcite.plan

Class Contexts

java.lang.Object

org.apache.calcite.plan.Contexts

public class Contexts
extends Object

Utilities for Context.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	Contexts.ChainContext Context that wraps a chain of contexts.
(package private) static class	Contexts.EmptyContext Empty context.
private static class	Contexts.WrapContext Context that wraps an object.

Field Summary

Fields

Modifier and Type	Field and Description
static Contexts.EmptyContext	EMPTY_CONTEXT

Constructor Summary

Constructors

Modifier	Constructor and Description
private	Contexts()

Method Summary

Modifier and Type	Method and Description
private static void	build(List<Context> list, Context context) Recursively populates a list of contexts.
static Context	chain(Context... contexts) Returns a context that wraps a list of contexts.
private static Context	chain(Iterable<? extends Context> contexts)
static Context	empty() Returns a context that returns null for all inquiries.
static Context	of(Object... os) Returns a context that wraps an array of objects, ignoring any nulls.
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 Contexts.EmptyContext EMPTY_CONTEXT

Constructor Detail

Contexts

private Contexts()

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.

of

public static Context of(Object... os)

Returns a context that wraps an array of objects, ignoring any nulls.

chain

public static Context chain(Context... contexts)

Returns a context that wraps a list of contexts.

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.

chain

private static Context chain(Iterable<? extends Context> contexts)

build

private static void build(List<Context> list,
                          Context context)

Recursively populates a list of contexts.