How to use

NativeIDN

in

libcore.icu

public static String toUnicode(String s, int flags) {
  try {
    return convert(s, flags, false);
  } catch (IllegalArgumentException ex) {
    // The RI documentation explicitly states that this method can't fail.
    // ICU4C disagrees, as does the RI in practice.
    // The RI just returns the input string if it can't
    return s;
  }
}

private static String convert(String s, int flags, boolean toAscii) {
  if (s == null) {
    throw new NullPointerException("s == null");
  }
  return convertImpl(s, flags, toAscii);
}
private static native String convertImpl(String s, int flags, boolean toAscii);

/**
 * Transform a Unicode String to ASCII Compatible Encoding String according
 * to the algorithm defined in <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
 *
 * <p>If the transformation fails (because the input is not a valid IDN), an
 * exception will be thrown.
 *
 * <p>This method can handle either an individual label or an entire domain name.
 * In the latter case, the separators are: U+002E (full stop), U+3002 (ideographic full stop),
 * U+FF0E (fullwidth full stop), and U+FF61 (halfwidth ideographic full stop).
 * All of these will become U+002E (full stop) in the result.
 *
 * @param input the Unicode name
 * @param flags 0, {@code ALLOW_UNASSIGNED}, {@code USE_STD3_ASCII_RULES},
 *         or {@code ALLOW_UNASSIGNED | USE_STD3_ASCII_RULES}
 * @return the ACE name
 * @throws IllegalArgumentException if {@code input} does not conform to <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>
 */
public static String toASCII(String input, int flags) {
  return NativeIDN.toASCII(input, flags);
}

  /**
   * Equivalent to {@code toUnicode(input, 0)}.
   *
   * @param input the ACE name
   * @return the Unicode name
   */
  public static String toUnicode(String input) {
    return NativeIDN.toUnicode(input, 0);
  }
}

/**
 * Translates a string from ASCII Compatible Encoding (ACE) to Unicode
 * according to the algorithm defined in <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
 *
 * <p>Unlike {@code toASCII}, this transformation cannot fail.
 *
 * <p>This method can handle either an individual label or an entire domain name.
 * In the latter case, the separators are: U+002E (full stop), U+3002 (ideographic full stop),
 * U+FF0E (fullwidth full stop), and U+FF61 (halfwidth ideographic full stop).
 *
 * @param input the ACE name
 * @return the Unicode name
 * @param flags 0, {@code ALLOW_UNASSIGNED}, {@code USE_STD3_ASCII_RULES},
 *         or {@code ALLOW_UNASSIGNED | USE_STD3_ASCII_RULES}
 */
public static String toUnicode(String input, int flags) {
  return NativeIDN.toUnicode(input, flags);
}

public static String toASCII(String s, int flags) {
  return convert(s, flags, true);
}

  /**
   * Equivalent to {@code toUnicode(input, 0)}.
   *
   * @param input the ACE name
   * @return the Unicode name
   */
  public static String toUnicode(String input) {
    return NativeIDN.toUnicode(input, 0);
  }
}

private static String convert(String s, int flags, boolean toAscii) {
  if (s == null) {
    throw new NullPointerException("s == null");
  }
  return convertImpl(s, flags, toAscii);
}
private static native String convertImpl(String s, int flags, boolean toAscii);

/**
 * Transform a Unicode String to ASCII Compatible Encoding String according
 * to the algorithm defined in <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
 *
 * <p>If the transformation fails (because the input is not a valid IDN), an
 * exception will be thrown.
 *
 * <p>This method can handle either an individual label or an entire domain name.
 * In the latter case, the separators are: U+002E (full stop), U+3002 (ideographic full stop),
 * U+FF0E (fullwidth full stop), and U+FF61 (halfwidth ideographic full stop).
 * All of these will become U+002E (full stop) in the result.
 *
 * @param input the Unicode name
 * @param flags 0, {@code ALLOW_UNASSIGNED}, {@code USE_STD3_ASCII_RULES},
 *         or {@code ALLOW_UNASSIGNED | USE_STD3_ASCII_RULES}
 * @return the ACE name
 * @throws IllegalArgumentException if {@code input} does not conform to <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>
 */
public static String toASCII(String input, int flags) {
  return NativeIDN.toASCII(input, flags);
}

public static String toUnicode(String s, int flags) {
  try {
    return convert(s, flags, false);
  } catch (IllegalArgumentException ex) {
    // The RI documentation explicitly states that this method can't fail.
    // ICU4C disagrees, as does the RI in practice.
    // The RI just returns the input string if it can't
    return s;
  }
}

  /**
   * Equivalent to {@code toUnicode(input, 0)}.
   *
   * @param input the ACE name
   * @return the Unicode name
   */
  public static String toUnicode(String input) {
    return NativeIDN.toUnicode(input, 0);
  }
}

private static String convert(String s, int flags, boolean toAscii) {
  if (s == null) {
    throw new NullPointerException("s == null");
  }
  return convertImpl(s, flags, toAscii);
}
private static native String convertImpl(String s, int flags, boolean toAscii);

/**
 * Transform a Unicode String to ASCII Compatible Encoding String according
 * to the algorithm defined in <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
 *
 * <p>If the transformation fails (because the input is not a valid IDN), an
 * exception will be thrown.
 *
 * <p>This method can handle either an individual label or an entire domain name.
 * In the latter case, the separators are: U+002E (full stop), U+3002 (ideographic full stop),
 * U+FF0E (fullwidth full stop), and U+FF61 (halfwidth ideographic full stop).
 * All of these will become U+002E (full stop) in the result.
 *
 * @param input the Unicode name
 * @param flags 0, {@code ALLOW_UNASSIGNED}, {@code USE_STD3_ASCII_RULES},
 *         or {@code ALLOW_UNASSIGNED | USE_STD3_ASCII_RULES}
 * @return the ACE name
 * @throws IllegalArgumentException if {@code input} does not conform to <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>
 */
public static String toASCII(String input, int flags) {
  return NativeIDN.toASCII(input, flags);
}

public static String toUnicode(String s, int flags) {
  try {
    return convert(s, flags, false);
  } catch (IllegalArgumentException ex) {
    // The RI documentation explicitly states that this method can't fail.
    // ICU4C disagrees, as does the RI in practice.
    // The RI just returns the input string if it can't
    return s;
  }
}

  /**
   * Equivalent to {@code toUnicode(input, 0)}.
   *
   * @param input the ACE name
   * @return the Unicode name
   */
  public static String toUnicode(String input) {
    return NativeIDN.toUnicode(input, 0);
  }
}

private static String convert(String s, int flags, boolean toAscii) {
  if (s == null) {
    throw new NullPointerException("s == null");
  }
  return convertImpl(s, flags, toAscii);
}
private static native String convertImpl(String s, int flags, boolean toAscii);

/**
 * Transform a Unicode String to ASCII Compatible Encoding String according
 * to the algorithm defined in <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
 *
 * <p>If the transformation fails (because the input is not a valid IDN), an
 * exception will be thrown.
 *
 * <p>This method can handle either an individual label or an entire domain name.
 * In the latter case, the separators are: U+002E (full stop), U+3002 (ideographic full stop),
 * U+FF0E (fullwidth full stop), and U+FF61 (halfwidth ideographic full stop).
 * All of these will become U+002E (full stop) in the result.
 *
 * @param input the Unicode name
 * @param flags 0, {@code ALLOW_UNASSIGNED}, {@code USE_STD3_ASCII_RULES},
 *         or {@code ALLOW_UNASSIGNED | USE_STD3_ASCII_RULES}
 * @return the ACE name
 * @throws IllegalArgumentException if {@code input} does not conform to <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>
 */
public static String toASCII(String input, int flags) {
  return NativeIDN.toASCII(input, flags);
}

public static String toASCII(String s, int flags) {
  return convert(s, flags, true);
}

  /**
   * Equivalent to {@code toUnicode(input, 0)}.
   *
   * @param input the ACE name
   * @return the Unicode name
   */
  public static String toUnicode(String input) {
    return NativeIDN.toUnicode(input, 0);
  }
}

private static String convert(String s, int flags, boolean toAscii) {
  if (s == null) {
    throw new NullPointerException("s == null");
  }
  return convertImpl(s, flags, toAscii);
}
private static native String convertImpl(String s, int flags, boolean toAscii);