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* Strategy object used to execute event handler method. Will be called
* while looping through all the chained event handler implementations.
* Each EventHandler method call should have a parallel executor object
* @author <a href="mailto:email@example.com">Will Glass-Husain</a>
* @version $Id: EventHandlerMethodExecutor.java 470256 2006-11-02 07:20:36Z wglass $
public interface EventHandlerMethodExecutor
* Execute the event handler method. If Object is not null, do not
* iterate further through the handler chain.
* If appropriate, the returned Object will be the return value.
* @param handler call the appropriate method on this handler
* @exception Exception generic exception potentially thrown by event handlers
public void execute(EventHandler handler) throws Exception;
* Called after execute() to see if iterating should stop. Should
* always return false before method execute() is run.
* @return true if no more event handlers for this method should be called.
public boolean isDone();
* Get return value at end of all the iterations
* @return null if no return value is required
public Object getReturnValue();