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/*
* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD 3-clause license that
* can be found in the LICENSE.txt file in the project root.
*/
package org.antlr.v4.runtime.atn;
public class EmptyPredictionContext extends SingletonPredictionContext {
/**
* Represents {@code $} in local context prediction, which means wildcard.
* {@code *+x = *}.
*/
public static final EmptyPredictionContext Instance = new EmptyPredictionContext();
private EmptyPredictionContext() {
super(null, EMPTY_RETURN_STATE);
}
@Override
public boolean isEmpty() { return true; }
@Override
public int size() {
return 1;
}
@Override
public PredictionContext getParent(int index) {
return null;
}
@Override
public int getReturnState(int index) {
return returnState;
}
@Override
public boolean equals(Object o) {
return this == o;
}
@Override
public String toString() {
return "$";
}
}