PredictionContextCache

java.lang.Object
- org.antlr.v4.runtime.atn.PredictionContextCache

```
public class PredictionContextCache
extends java.lang.Object
```
Used to cache PredictionContext objects. Its used for the shared context cash associated with contexts in DFA states. This cache can be used for both lexers and parsers.

Field Summary

Fields
Modifier and Type Field Description

protected java.util.Map<PredictionContext,PredictionContext> cache

Constructor Summary

Constructors
Constructor Description

PredictionContextCache()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`PredictionContext`	`add(PredictionContext ctx)`	Add a context to the cache and return it.
`PredictionContext`	`get(PredictionContext ctx)`
`int`	`size()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - cache
```
protected final java.util.Map<PredictionContext,PredictionContext> cache
```
- Constructor Detail
  - PredictionContextCache
```
public PredictionContextCache()
```
- Method Detail
  - add
```
public PredictionContext add(PredictionContext ctx)
```
    Add a context to the cache and return it. If the context already exists, return that one instead and do not add a new context to the cache. Protect shared cache from unsafe thread access.
  - get
```
public PredictionContext get(PredictionContext ctx)
```
  - size
```
public int size()
```