[Springframework-developer] purpose of code in Errors.rejectValue ()

[John C. <joh...@sa...>]

Now I know what Rod was complaining about... in regards that the reply goes
back to the user, not the list.. there must be a way to fix that.



> -----Original Message-----
> From: John Cavacas
> Sent: Tuesday, March 04, 2003 12:27 PM
> To: 'Tony Falabella'
> Subject: RE: [Springframework-developer] purpose of code in
> Errors.rejectValue()
> 
> Tony,
> 
> Thanks for the reply.
> 
> That was my guess as well about the code property. But it also leads to
> another question.
> 
> The method signature is also includes the "message" parameter. So that is
> point of having both "code" and "message" if the "code" would contain the
> message? Do I perhaps not understand the intended use?
> 
> In my tests the functionality seems to be working as expected (not
> including the codes as I'm not currently using them). I'm using the
> BindException implementation class to hold the errors for my domain object
> validator.
> 
> My original idea was to use this validator to perform syntactic and
> semantic validation, but I've quickly realized that the only way this
> validator can do that is if it has access to the business object, which in
> my opinion it can't or shouldn't have. It seems that the validator
> interface is really more suited for syntactic validation to occour for
> example before the object is sent to the business method. The only way
> that I can think of making that work is if somehow the validator object
> and the business object had access to the same Errors object. To be more
> specific...
> 
> My validator object can check for example to see if an email address looks
> like it is properly formatted. However I also need to know if this
> particular email message already exists in my database because my business
> rule dictates that there cannot be duplicate email addresses. In order for
> the validator object to know that, it would have to ask the business
> object to perform that look up, which in my opinion doesn't seem right.
> 
> So my current solution is to perform the syntactic validation on the
> validator, pass the domain object (a command) to the business method, and
> let the business method perform the business rules, which in case of
> problems would be expressed as typed exceptions. Does this make sense? Or
> is there a way to actually make the validator perform both functions?
> 
> Thanks,
> John
> 
> 
> 
> > -----Original Message-----
> > From: Tony Falabella [mailto:ton...@ya...]
> > Sent: Monday, March 03, 2003 8:58 PM
> > To: joh...@sa...; springframework-
> dev...@li...
> > Subject: RE: [Springframework-developer] purpose of code in
> > Errors.rejectValue()
> >
> > John,
> >
> > I believe the "code" field refers to an "ErrorCode" that could be used
> > as a string value of an error msg that is associated with that Error.
> > (Similar to a mainframe returning an error code when a bad message is
> > returned to a user, only since it's a string it can actually be a bit
> > descriptive for the user.)  See the javadocs for the
> > com.interface21.core.ErrorCoded interface for a detailed description.
> >
> > I am making some changes to the framework (then will pend review from
> > Rod) to allowing ResourceBundles to be tied into a few things within the
> > framework a little better.
> >
> > Right now, I believe the API to obtaining messages for anything in the
> > framework is limited in 2 ways:
> > 1)  Does not allow parameters to be passed to it.
> > 2)  Some of the APIs do not allow a Locale to be passed into them (the
> > Errors.rejectValue(...) is a good example.
> >
> > My changes should address both these issues.  Also, I am attempting to
> > add a subclass to the NestedException class (that merely calls a helper
> > object) that will allow Exceptions themselves to obtain their messages
> > from a ResourceBundle.  I have this working now for myself, but wish to
> > make a few changes to it to model the behavior of how log4j allows you
> > to point various classes to various files (ie: Exceptions in this
> > package look to this file for their msgs).  I am a few days away from a
> > code review on this.
> >
> > As far as answering your question about examples, I'm sorry but I don't
> > have any examples to give you.
> >
> >
> > -----Original Message-----
> > From: spr...@li...
> > [mailto:spr...@li...] On Behalf
> > Of John Cavacas
> > Sent: Monday, March 03, 2003 4:03 PM
> > To: spr...@li...
> > Subject: [Springframework-developer] purpose of code in
> > Errors.rejectValue()
> >
> > I was wondering if someone, most likelly Rob, could tell me what the
> > purpose of the String code parameter is in Errors.rejectValue(String
> > field,String code,String message) method.
> >
> > And like my previous email "Validation usage examples and questions" i
> > am looking for further clarification and proposed usage of the
> > validation and DataBinding techniques in the framework.
> >
> > Thanks,
> > John
> >
> >
> >
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