EventEmitter.java

/**
 * The MIT License
 * Copyright (c) 2014-2016 Ilkka Seppälä
 *
 * 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 OR COPYRIGHT HOLDERS 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 com.iluwatar.event.aggregator;

import java.util.LinkedList;
import java.util.List;

/**
 * 
 * EventEmitter is the base class for event producers that can be observed.
 *
 */
public abstract class EventEmitter {

  private List<EventObserver> observers;

  public EventEmitter() {
    observers = new LinkedList<>();
  }

  public EventEmitter(EventObserver obs) {
    this();
    registerObserver(obs);
  }

  public final void registerObserver(EventObserver obs) {
    observers.add(obs);
  }

  protected void notifyObservers(Event e) {
    for (EventObserver obs : observers) {
      obs.onEvent(e);
    }
  }

  public abstract void timePasses(Weekday day);
}