Package org.antlr.v4.runtime.atn

Class PredictionContextCache

java.lang.Object

org.antlr.v4.runtime.atn.PredictionContextCache

public class PredictionContextCache
extends 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 Map<PredictionContext,PredictionContext>	cache

Constructor Summary

Constructors

Constructor	Description
PredictionContextCache()

Method Summary

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 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()