class ForeCastMatcher extends GenericMatchEngine {
  @Override
  protected AbstractSimilarityChecker prepareChecker() {
    return new AbstractSimilarityChecker(filter) {

      @Override
      public boolean isSimilar(EObject obj1, final EObject obj2)
          throws FactoryException {
        WorldcupforecastSwitch<Boolean> comparison = new WorldcupforecastSwitch<Boolean>() {

          @Override
          public Boolean caseForecast(Forecast object) {
            return EcoreUtil.equals(object.getMatch(),
                ((Forecast) obj2).getMatch());
          }

          @Override
          public Boolean caseForecastDay(ForecastDay object) {

            return object.getDate().equals(((ForecastDay) obj2).getDate());
          }

          @Override
          public Boolean casePlayer(Player object) {
            return true;
          }
        };
        return comparison.doSwitch(obj1);
      }

      @Override
      public double absoluteMetric(EObject obj1, EObject obj2)
          throws FactoryException {
        if (isSimilar(obj1, obj2)) {
          return 1.0;
        }
        return 0;
      }

      @Override
      public void init(Resource leftResource, Resource rightResource)
          throws FactoryException {

      }

      @Override
      public void init(EObject leftObject, EObject rightObject)
          throws FactoryException {
      }

    };
  }