content: /*
   * Copyright 2013 Hannes Janetzek
   * Copyright 2016 Andrey Novikov
   *
   * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
   *
   * This program is free software: you can redistribute it and/or modify it under the
   * terms of the GNU Lesser General Public License as published by the Free Software
   * Foundation, either version 3 of the License, or (at your option) any later version.
   *
   * This program 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 Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License along with
   * this program. If not, see <http://www.gnu.org/licenses/>.
   */
  package org.oscim.event;
  
  import org.oscim.utils.pool.LList;
  
  /**
   * The Class EventDispatcher.
   * <p/>
   * Events MUST be dispatched from main-loop! To add events from other
   * threads use:
   * Map.post(new Runnable(){ public void run(tell(event,data);)};);
   *
   * @param <T> the event source type
   * @param <E> the event 'data' type
   */
  public abstract class EventDispatcher<E extends EventListener, T> {
  
      /**
       * The list of listeners.
       */
      protected LList<E> mListeners;
  
      /**
       * Bind listener for event notifications.
       */
      public void bind(E listener) {
          if (LList.find(mListeners, listener) != null) {
              return;
          }
          mListeners = LList.push(mListeners, listener);
      }
  
      /**
       * Remove listener.
       */
      public void unbind(E listener) {
          mListeners = LList.remove(mListeners, listener);
      }
  
      /**
       * Tell listeners whats going on.
       *
       * @param event the event
       * @param data  the data
       */
      public abstract void tell(E listener, Event event, T data);
  
      public void fire(Event event, T data) {
          for (LList<E> l = mListeners; l != null; l = l.next) {
              tell(l.data, event, data);
          }
      }
  }
  