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Java Standard Edition (SE)

EventListenerProxy


compact1, compact2, compact3
java.util

Class EventListenerProxy<T extends EventListener>

  • All Implemented Interfaces:
    EventListener
    Direct Known Subclasses:
    AWTEventListenerProxy, PropertyChangeListenerProxy, VetoableChangeListenerProxy


    public abstract class EventListenerProxy<T extends EventListener>
    extends Object
    implements EventListener
    An abstract wrapper class for an EventListener class which associates a set of additional parameters with the listener. Subclasses must provide the storage and accessor methods for the additional arguments or parameters.

    For example, a bean which supports named properties would have a two argument method signature for adding a PropertyChangeListener for a property:

     public void addPropertyChangeListener(String propertyName,
                                           PropertyChangeListener listener)
     
    If the bean also implemented the zero argument get listener method:
     public PropertyChangeListener[] getPropertyChangeListeners()
     
    then the array may contain inner PropertyChangeListeners which are also PropertyChangeListenerProxy objects.

    If the calling method is interested in retrieving the named property then it would have to test the element to see if it is a proxy class.

    Since:
    1.4
    • Constructor Detail

      • EventListenerProxy

        public EventListenerProxy(T listener)
        Creates a proxy for the specified listener.
        Parameters:
        listener - the listener object
    • Method Detail

      • getListener

        public T getListener()
        Returns the listener associated with the proxy.
        Returns:
        the listener associated with the proxy


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