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.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static final class	PredictionContextCache.IdentityCommutativePredictionContextOperands
protected static final class	PredictionContextCache.PredictionContextAndInt

Field Summary

Fields

Modifier and Type	Field	Description
private final Map<PredictionContextCache.PredictionContextAndInt,PredictionContext>	childContexts
private final Map<PredictionContext,PredictionContext>	contexts
private final boolean	enableCache
private final Map<PredictionContextCache.IdentityCommutativePredictionContextOperands,PredictionContext>	joinContexts
static final PredictionContextCache	UNCACHED

Constructor Summary

Constructors

Modifier	Constructor	Description
	PredictionContextCache()
private	PredictionContextCache(boolean enableCache)

Method Summary

Modifier and Type	Method	Description
PredictionContext	getAsCached(PredictionContext context)
PredictionContext	getChild(PredictionContext context, int invokingState)
PredictionContext	join(PredictionContext x, PredictionContext y)

Methods inherited from class java.lang.Object

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

Field Details

UNCACHED

public static final PredictionContextCache UNCACHED

contexts

private final Map<PredictionContext,PredictionContext> contexts

childContexts

private final Map<PredictionContextCache.PredictionContextAndInt,PredictionContext> childContexts

joinContexts

private final Map<PredictionContextCache.IdentityCommutativePredictionContextOperands,PredictionContext> joinContexts

enableCache

private final boolean enableCache

Constructor Details

PredictionContextCache

public PredictionContextCache()

PredictionContextCache

private PredictionContextCache(boolean enableCache)

Method Details

getAsCached

public PredictionContext getAsCached(PredictionContext context)

getChild

public PredictionContext getChild(PredictionContext context,
 int invokingState)

join

public PredictionContext join(PredictionContext x,
 PredictionContext y)