<Swing Dev> Add Look&Feel support for AIX platform

[Steve Poole]

On Tue, 2011-10-18 at 12:27 +0100, Tom Hawtin wrote:
> On 18/10/2011 11:15, Steve Poole wrote:
> > On Tue, 2011-10-18 at 15:53 +0800, Sean Chou wrote:
> >
> > Hi Sean,   I wonder if the inclusion of AIX in the enum is at the wrong
> > point?    You've added it before UNKNOWN which makes logical sense - but
> > you have changed UNKNOWN's ordinal value so if the enum is
> > serialised/deserialised  then you could in theory break  something
> > relying on UNKNOWN being the 4th entry
> >
> > Its a small point and unlikely to happen I expect but I thought I'd
> > point it out.
> 
> It does change the ordinal but it's not a technically binary 
> compatibility change as defined by the JLS (3rd Ed. 13.4.26). The 
> behavioural change by insertion is less significant as the results from 
> compareTo select the same sort order.
> 
> http://java.sun.com/docs/books/jls/third_edition/html/binaryComp.html#13.4.26
> 
> "13.4.26 Evolution of Enums
> 
> "Adding or reordering constants from an enum type will not break 
> compatibility with pre-existing binaries.
> If a precompiled binary attempts to access an enum constant that no 
> longer exists, the client will fail at runtime with a NoSuchFieldError. 
> Therefore such a change is not recommended for widely distributed enums.
> 
> "In all other respects, the binary compatibility rules for enums are 
> identical to those for classes."
> 
> 
> Java Serialisation serialises enums by name rather than just ordinal.
> 
Thanks for the clarification Tom.

> Tom
>