/***************************************************************************
* Copyright (C) 2012 by H-Store Project *
* Brown University *
* Massachusetts Institute of Technology *
* Yale University *
* *
* http://hstore.cs.brown.edu/ *
* *
* Permission is hereby granted, free of charge, to any person obtaining *
* a copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, sublicense, and/or sell copies of the Software, and to *
* permit persons to whom the Software is furnished to do so, subject to *
* the following conditions: *
* *
* The above copyright notice and this permission notice shall be *
* included in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, *
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
* OTHER DEALINGS IN THE SOFTWARE. *
***************************************************************************/
package edu.brown.utils;
import java.util.Observable;
import java.util.Observer;
/**
* EventObservable
*/
public abstract class EventObserver<T> {
protected class InnerObserver implements Observer {
@SuppressWarnings("unchecked")
@Override
public void update(Observable o, Object arg) {
assert (o instanceof EventObservable<?>.InnerObservable);
EventObserver.this.update(((EventObservable.InnerObservable) o).getEventObservable(), (T) arg);
}
public EventObserver<T> getEventObserver() {
return (EventObserver.this);
}
}
private final InnerObserver observer;
public EventObserver() {
this.observer = new InnerObserver();
}
protected Observer getObserver() {
return (this.observer);
}
public abstract void update(EventObservable<T> o, T arg);
}