return 0;
    }

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

  private static final class EqualsBasedOnToString {
    private final String s;

    private EqualsBasedOnToString(String s) {
      this.s = s;
    }

    @Override
    public boolean equals(@Nullable Object obj) {
      return obj != null && obj.toString().equals(toString());