content: /**
   * This file is part of Aion-Lightning <aion-lightning.org>.
   *
   *  Aion-Lightning 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.
   *
   *  Aion-Lightning 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 Aion-Lightning.
   *  If not, see <http://www.gnu.org/licenses/>.
   */
  package com.aionemu.gameserver.controllers.movement;
  
  import com.aionemu.gameserver.model.gameobjects.Creature;
  
  import javolution.util.FastMap;
  
  /**
   * @author Rolandas
   */
  public class SeenCreatureList {
  
  	private FastMap<Integer, Creature> seenCreatures;
  
  	public boolean add(Creature creature) {
  		if (seenCreatures == null) {
  			seenCreatures = FastMap.newInstance();
  		}
  		return seenCreatures.putIfAbsent(creature.getObjectId(), creature) == null;
  	}
  
  	public boolean remove(Creature creature) {
  		if (seenCreatures == null) {
  			return false;
  		}
  		return seenCreatures.remove(creature.getObjectId()) != null;
  	}
  
  	public void clear() {
  		if (seenCreatures != null) {
  			seenCreatures.clear();
  		}
  	}
  
  	public boolean contains(Creature creature) {
  		if (seenCreatures == null) {
  			return false;
  		}
  		return seenCreatures.containsKey(creature.getObjectId());
  	}
  }
  