Re: [gdome]Exception Codes again

[Paolo Casarini <casarini CS UniBO IT>]

On Mon, 7 Jan 2002, Tobias Peters wrote:

> Paolo wrote:
> > suggestions will be appreciated!
> 
> But now I searched and learned that Exception codes in other modules do
> interfere with the Core Exception codes. Sorry, I should have done that
> before I wrote my last mail.
> 
> This constant is not nececcary.
> 
> What about:
> 
> enum Core_Exception{... /* as currently implemented */)
> enum Event_Exception{UNSPECIFIED_EVENT_TYPE_ERR = 0};
> enum XPath_Exception{INVALID_EXPRESSION_ERR = 1,
>                      TYPE_ERR               = 2};
> enum Exception_Type{CORE_EXCEPTION  = 0 << 16,
>                     EVENT_EXCEPTION = 1 << 16,
>                     XPATH_EXCEPTION = 2 << 16};
> enum Exception_Masks{EXCEPTION_TYPE_MASK = 255 << 16,
>                      EXCEPTION_CODE_MASK = 65535};
> 
> then, after a gdome function call
> if (exc != 0) {
>   Gdome_Excpetion exc_type = exc & EXCEPTION_TYPE_MASK;
>   Gdome_Excpetion exc_code = exc & EXCEPTION_CODE_MASK;
>   switch(exc_type){
> 	case ...
>   }
> }
> 
> In some way, this would be compliant to the DOM recommendation, since
> (unsigned short)exc yields the correct exception code (with the IDL
> definition of unsigned short, being 16 bits, of course).
> 
This is, in my opinion, a great solution! I'll implement it this
evening...


Thanx,
   paolo.