this.trueValue = trueValue;
      this.toString = toString;
    }

    @Override
    public int compare(Boolean a, Boolean b) {
      int aVal = a ? trueValue : 0;
      int bVal = b ? trueValue : 0;
      return bVal - aVal;
    }

    @Override
    public String toString() {
      return toString;
    }
  }

  /**