A data class holding information about an event listener registration.
An instance of this class stores all information required to determine whether a specific event listener is to be invoked for a given event. The class is used internally by {@link EventListenerList}, but is also useful in general when information about event listeners is to be stored.
Implementation note: Instances of this class are immutable and can safely be shared between multiple threads or components.
@version $Id: EventListenerRegistrationData.java 1624601 2014-09-12 18:04:36Z oheger $ @since 2.0 @param < T> the type of events processed by the listener
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