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Android APIs
public final class

IDN

extends Object
java.lang.Object
   ↳ java.net.IDN

Class Overview

Converts internationalized domain names between Unicode and the ASCII Compatible Encoding (ACE) representation.

See RFC 3490 for full details.

Summary

Constants
int ALLOW_UNASSIGNED When set, allows IDN to process unassigned unicode points.
int USE_STD3_ASCII_RULES When set, ASCII strings are checked against RFC 1122 and RFC 1123 .
Public Methods
static String toASCII ( String input)
Equivalent to toASCII(input, 0) .
static String toASCII ( String input, int flags)
Transform a Unicode String to ASCII Compatible Encoding String according to the algorithm defined in RFC 3490 .
static String toUnicode ( String input, int flags)
Translates a string from ASCII Compatible Encoding (ACE) to Unicode according to the algorithm defined in RFC 3490 .
static String toUnicode ( String input)
Equivalent to toUnicode(input, 0) .
[Expand]
Inherited Methods
From class java.lang.Object

Constants

public static final int ALLOW_UNASSIGNED

Added in API level 9

When set, allows IDN to process unassigned unicode points.

Constant Value: 1 (0x00000001)

public static final int USE_STD3_ASCII_RULES

Added in API level 9

When set, ASCII strings are checked against RFC 1122 and RFC 1123 .

Constant Value: 2 (0x00000002)

Public Methods

public static String toASCII ( String input)

Added in API level 9

Equivalent to toASCII(input, 0) .

Parameters
input the Unicode name
Returns
  • the ACE name
Throws
IllegalArgumentException if input does not conform to RFC 3490

public static String toASCII ( String input, int flags)

Added in API level 9

Transform a Unicode String to ASCII Compatible Encoding String according to the algorithm defined in RFC 3490 .

If the transformation fails (because the input is not a valid IDN), an exception will be thrown.

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.

Parameters
input the Unicode name
flags 0, ALLOW_UNASSIGNED , USE_STD3_ASCII_RULES , or ALLOW_UNASSIGNED | USE_STD3_ASCII_RULES
Returns
  • the ACE name
Throws
IllegalArgumentException if input does not conform to RFC 3490

public static String toUnicode ( String input, int flags)

Added in API level 9

Translates a string from ASCII Compatible Encoding (ACE) to Unicode according to the algorithm defined in RFC 3490 .

Unlike toASCII , this transformation cannot fail.

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).

Parameters
input the ACE name
flags 0, ALLOW_UNASSIGNED , USE_STD3_ASCII_RULES , or ALLOW_UNASSIGNED | USE_STD3_ASCII_RULES
Returns
  • the Unicode name

public static String toUnicode ( String input)

Added in API level 9

Equivalent to toUnicode(input, 0) .

Parameters
input the ACE name
Returns
  • the Unicode name