From d694fe7d5564792440dcaa9e2d04b275aee7f43d Mon Sep 17 00:00:00 2001
From: Klaus Reimer <k@ailis.de>
Date: Sun, 24 Feb 2013 02:02:06 +0100
Subject: [PATCH] Ignore duplicate listeners.

---
 src/main/java/de/ailis/usb4java/support/EventListenerList.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/main/java/de/ailis/usb4java/support/EventListenerList.java b/src/main/java/de/ailis/usb4java/support/EventListenerList.java
index 352d798..a2e6fb1 100644
--- a/src/main/java/de/ailis/usb4java/support/EventListenerList.java
+++ b/src/main/java/de/ailis/usb4java/support/EventListenerList.java
@@ -31,6 +31,7 @@ public abstract class EventListenerList<T extends EventListener>
      */
     public final void add(final T listener)
     {
+        if (this.listeners.contains(listener)) return;
         this.listeners.add(listener);
     }