Interface IHandler

    • Method Detail

      • addHandlerListener

        void addHandlerListener​(IHandlerListener handlerListener)
        Registers an instance of IHandlerListener to listen for changes to properties of this instance.
        Parameters:
        handlerListener - the instance to register. Must not be null. If an attempt is made to register an instance which is already registered with this instance, no operation is performed.
      • dispose

        void dispose()
        Disposes of this handler. This method is run once when the object is no longer referenced. This can be used as an opportunity to unhook listeners from other objects.
      • execute

        Object execute​(ExecutionEvent event)
                throws ExecutionException
        Executes with the map of parameter values by name.
        Parameters:
        event - An event containing all the information about the current state of the application; must not be null.
        Returns:
        the result of the execution. Reserved for future use, must be null.
        Throws:
        ExecutionException - if an exception occurred during execution.
      • isEnabled

        boolean isEnabled()
        Returns whether this handler is capable of executing at this moment in time. If the enabled state is other than true clients should also consider implementing IHandler2 so they can be notified about framework execution contexts.
        Returns:
        true if the command is enabled; false otherwise.
        See Also:
        IHandler2.setEnabled(Object)
      • isHandled

        boolean isHandled()
        Returns whether this handler is really capable of handling delegation. In the case of a handler that is a composition of other handlers, this reply is intended to indicate whether the handler is truly capable of receiving delegated responsibilities at this time.
        Returns:
        true if the handler is handled; false otherwise.
      • removeHandlerListener

        void removeHandlerListener​(IHandlerListener handlerListener)
        Unregisters an instance of IHandlerListener listening for changes to properties of this instance.
        Parameters:
        handlerListener - the instance to unregister. Must not be null. If an attempt is made to unregister an instance which is not already registered with this instance, no operation is performed.