[TRINIDAD-2230] adjustments to the UIXComponentBase subscribeToEvent and unsubscribeFromEvent implementation

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.1-core
• Fix Version/s: 2.0.2-core
• Component/s: Components
• Environment: n/a
• Assignee: Unassigned
• Reporter: Gary VanMatre
• Created: 01/Mar/12 22:48
• Updated: 06/Mar/12 03:50
• Resolved: 06/Mar/12 03:50

Description

These new JSF 2 methods on the UIComponent (subscribeToEvent and unsubscribeFromEvent) has a very strange contract. The formal parameter for the listener is of type ComponentSystemEventListener. However, the method to query for the registered listeners getListenersForEventClass returns a list of SystemEventListener. The ComponentSystemEventListener and SystemEventListener do not have a common heritage so the subscribeToEvent and unsubscribeFromEvent creates a wrapper that implements the SystemEventListener.

Since the resultant objects from getListenersForEventClass are a wrapper, there is no way to determine if the original listener added by calling subscribeToEvent is in the list of wrapper objects since the wrapper is a private nested class and doesn't necessary implement the ComponentSystemEventListener interfaces.