svarzee.gps.gpsoauth.Try Maven / Gradle / Ivy

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package svarzee.gps.gpsoauth;

class Try {
  private static final Try FAILURE = new Try();
  private final T value;

  private Try() {
    value = null;
  }

  private Try(T value) {
    if (value == null) throw new IllegalArgumentException();
    this.value = value;
  }

  public boolean isFailure() {
    return this == FAILURE;
  }

  public T get() {
    if (isFailure()) throw new IllegalStateException("Cannot get value from a failure.");
    return value;
  }

  public static  Try of(T value) {
    return new Try<>(value);
  }

  public static  Try failure() {
    @SuppressWarnings("unchecked")
    Try failure = (Try) FAILURE;
    return failure;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }

    if (!(obj instanceof Try)) {
      return false;
    }

    Try aTry = (Try) obj;

    return value != null ? value.equals(aTry.value) : aTry.value == null;

  }

  @Override
  public int hashCode() {
    return value != null ? value.hashCode() : 0;
  }
}