Contexts (Apache Calcite API)

java.lang.Object
- org.apache.calcite.plan.Contexts

public class Contexts
extends java.lang.Object

Utilities for Context.

Nested Class Summary

Nested Classes
Modifier and Type	Class	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 Description

static Contexts.EmptyContext EMPTY_CONTEXT

Constructor Summary

Constructors
Modifier Constructor Description

private Contexts()

Method Summary

All Methods Static Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`private static void`	`build(java.util.List<Context> list, Context context)`	Recursively populates a list of contexts.
`private static Context`	`chain(java.lang.Iterable<? extends Context> contexts)`
`static Context`	`chain(Context... contexts)`	Returns a context that wraps a list of contexts.
`static Context`	`empty()`	Returns a context that returns null for all inquiries.
`static Context`	`of(java.lang.Object o)`	Returns a context that wraps an object.
`static Context`	`of(java.lang.Object... os)`	Returns a context that wraps an array of objects, ignoring any nulls.
`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(java.lang.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(java.lang.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(java.lang.Iterable<? extends Context> contexts)
```
  - build
```
private static void build(java.util.List<Context> list,
                          Context context)
```
    Recursively populates a list of contexts.