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   package nl.tudelft.goal.ut2004.visualizer.timeline.map;
   
   import cz.cuni.amis.pogamut.base3d.worldview.object.Location;
   
   /**
   * FadeLine that is used when there is not fade line.
   * Fadeline is empty and has duration 0.
   * <p>
   * Use this instead of null for non-existent fade line.
   * @author Honza
   */
  public class DefaultFadeLine implements IFadeLine {
  
      @Override
      public Location getPosition(long time) {
          throw new UnsupportedOperationException("No location for time " + time);
      }
  
      @Override
      public long getDuration() {
          return 0;
      }
  }