From bedc502d33e852d2aef5113b26ff3bb4d5b4bf1f Mon Sep 17 00:00:00 2001
From: Sam Harwell <sam@tunnelvisionlabs.com>
Date: Sun, 26 Feb 2012 15:02:14 -0600
Subject: [PATCH] Set the listeners list back to null if all listeners are
 removed from it

---
 runtime/Java/src/org/antlr/v4/runtime/Parser.java | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/runtime/Java/src/org/antlr/v4/runtime/Parser.java b/runtime/Java/src/org/antlr/v4/runtime/Parser.java
index 7fa0cfb6a..b5940bf0a 100644
--- a/runtime/Java/src/org/antlr/v4/runtime/Parser.java
+++ b/runtime/Java/src/org/antlr/v4/runtime/Parser.java
@@ -175,10 +175,17 @@ public abstract class Parser extends Recognizer<Token, ParserATNSimulator<Token>
 
 	public void removeParseListener(ParseListener<Token> l) {
 		if ( l==null ) return;
-		if ( _parseListeners!=null ) _parseListeners.remove(l);
+		if ( _parseListeners!=null ) {
+			_parseListeners.remove(l);
+			if (_parseListeners.isEmpty()) {
+				_parseListeners = null;
+			}
+		}
 	}
 
-	public void removeParseListeners() { if ( _parseListeners!=null ) _parseListeners.clear(); }
+	public void removeParseListeners() {
+		_parseListeners = null;
+	}
 
 	public void triggerEnterRuleEvent() {
 		for (ParseListener<Token> l : _parseListeners) {