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// Copyright 2011-2012 David A. Greenbaum /*// ww w .java2 s .c o m This file is part of Tip On Discount. Tip On Discount is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Tip On Discount is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Tip On Discount. If not, see <http://www.gnu.org/licenses/>. */ package com.itllp.tipOnDiscount.model; import java.util.HashSet; import com.itllp.tipOnDiscount.model.update.Update; public class DataModelObservable { private HashSet<DataModelObserver> observerSet = new HashSet<DataModelObserver>(); public void addObserver(DataModelObserver o) { observerSet.add(o); } public void deleteObserver(DataModelObserver o) { observerSet.remove(o); } public void notifyObservers(DataModel model, Update item) { for (DataModelObserver observer: observerSet) { observer.update(model, item); } } }