content: /**
   * Copyright (C) 2010-2016 eBusiness Information, Excilys Group
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not
   * use this file except in compliance with the License. You may obtain a copy of
   * the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed To in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations under
   * the License.
   */
  package org.androidannotations.api.view;
  
  import java.util.LinkedHashSet;
  import java.util.Set;
  
  public class OnViewChangedNotifier {
  
  	private static OnViewChangedNotifier currentNotifier;
  
  	public static OnViewChangedNotifier replaceNotifier(OnViewChangedNotifier notifier) {
  		OnViewChangedNotifier previousNotifier = currentNotifier;
  		currentNotifier = notifier;
  		return previousNotifier;
  	}
  
  	public static void registerOnViewChangedListener(OnViewChangedListener listener) {
  		if (currentNotifier != null) {
  			currentNotifier.listeners.add(listener);
  		}
  	}
  
  	private final Set<OnViewChangedListener> listeners = new LinkedHashSet<>();
  
  	public void notifyViewChanged(HasViews hasViews) {
  		for (OnViewChangedListener listener : listeners) {
  			listener.onViewChanged(hasViews);
  		}
  	}
  
  }
  