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UIDUtil

Package | mx.utils
Class | public class UIDUtil
Inheritance | UIDUtil Object

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The UIDUtil class is an all-static class with methods for working with UIDs (unique identifiers) within Flex. You do not create instances of UIDUtil; instead you simply call static methods such as the `UIDUtil.createUID()` method.

Note: If you have a dynamic object that has no [Bindable] properties (which force the object to implement the IUID interface), Flex adds an `mx_internal_uid` property that contains a UID to the object. To avoid having this field in your dynamic object, make it [Bindable], implement the IUID interface in the object class, or set a property with a value.

Public Methods

| Method | Defined By
--- | --- | ---
|  | createUID():String [static] Generates a UID (unique identifier) based on ActionScript's pseudo-random number generator and the current time. | UIDUtil
|  | fromByteArray(ba:ByteArray):String [static] Converts a 128-bit UID encoded as a ByteArray to a String representation. | UIDUtil
|  | getUID(item:Object):String [static] Returns the UID (unique identifier) for the specified object. | UIDUtil
|  | isUID(uid:String):Boolean [static] A utility method to check whether a String value represents a correctly formatted UID value. | UIDUtil
|  | toByteArray(uid:String):ByteArray [static] Converts a UID formatted String to a ByteArray. | UIDUtil

Method Detail

createUID | () | method

`public static function createUID():String`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Generates a UID (unique identifier) based on ActionScript's pseudo-random number generator and the current time.

The UID has the form `"XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"` where X is a hexadecimal digit (0-9, A-F).

This UID will not be truly globally unique; but it is the best we can do without player support for UID generation.

Returns

| `String` — The newly-generated UID.

fromByteArray | () | method |

`public static function fromByteArray(ba:ByteArray):String`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Converts a 128-bit UID encoded as a ByteArray to a String representation. The format matches that generated by createUID. If a suitable ByteArray is not provided, null is returned.

Parameters

| `ba:ByteArray` — ByteArray 16 bytes in length representing a 128-bit UID.

Returns

| `String` — String representation of the UID, or null if an invalid ByteArray is provided.

getUID | () | method |

`public static function getUID(item:Object):String`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Returns the UID (unique identifier) for the specified object. If the specified object doesn't have an UID then the method assigns one to it. If a map is specified this method will use the map to construct the UID. As a special case, if the item passed in is null, this method returns a null UID.

Parameters

| `item:Object` — Object that we need to find the UID for.

Returns

| `String` — The UID that was either found or generated.

isUID | () | method |

`public static function isUID(uid:String):Boolean`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A utility method to check whether a String value represents a correctly formatted UID value. UID values are expected to be in the format generated by createUID(), implying that only capitalized A-F characters in addition to 0-9 digits are supported.

Parameters

| `uid:String` — The value to test whether it is formatted as a UID.

Returns

| `Boolean` — Returns true if the value is formatted as a UID.

toByteArray | () | method |

`public static function toByteArray(uid:String):ByteArray`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Converts a UID formatted String to a ByteArray. The UID must be in the format generated by createUID, otherwise null is returned.

Parameters

| `uid:String` — representing a 128-bit UID

Returns

| `ByteArray` — ByteArray 16 bytes in length representing the 128-bits of the UID or null if the uid could not be converted.

Thu Jan 16 2014, 01:11 PM +08:00