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Date: Wed, 23 Nov 2011 15:07:40 +0000 (UTC)
From: "Joerg Schaible (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (LANG-778) Add UUIDUtils.toByteArray and
 UUIDUtils.fromByteArray
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    [ https://issues.apache.org/jira/browse/LANG-778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13155909#comment-13155909 ] 

Joerg Schaible commented on LANG-778:
-------------------------------------

bq: BTW, why did you decide to use high byte first?

This is what I said: The UUID is *defined* as sequence of 16 bytes together with a String representation. There's no endian stuff involved. It's just that the UUID Java implementation provides access to the single bits using two long values, which should be a lot faster than an indirection using String. The Java runtime developers did use big endian as natural choice of the JVM default.

So, the endian problem does not affect the proposed UUIDUtils, but for something like ByteUtils this might be different. One solution is to document that this class expects big endian and that EndianUtils can be used otherwise.
                
> Add UUIDUtils.toByteArray and UUIDUtils.fromByteArray
> -----------------------------------------------------
>
>                 Key: LANG-778
>                 URL: https://issues.apache.org/jira/browse/LANG-778
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.*
>            Reporter: Joerg Schaible
>            Assignee: Joerg Schaible
>            Priority: Minor
>         Attachments: LANG-778.diff
>
>   Original Estimate: 4h
>  Remaining Estimate: 4h
>
> A UUID represents 16 bytes. In some situation (e.g. using DBs that do not have native support for the type UUID) it is necessary to use directly the bytes. The JDK does not support the transformation from UUID to bytes and back, therefore I'd like to add UUIDUtils with the two proposed methods.

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