Re: [castor-dev] Significance of _has_someFileld in the codegenerated bySource generator

[Kothapalli Choudary]

That answers my question. Thanks very much.   Choudary. >>> [EMAIL PROTECTED] 07/07/03 10:15AM >>> Hi, On Monday, July 7, 2003, at 09:20  AM, Kothapalli Choudary wrote: > True, but my query was when and why do you need to know that? You need to know it if the attribute/element is optional.  If you have  an optional attribute (use="optional" or no use definition) or element  (minOccurs="0") that maps to a primitive type, Castor needs to know  whether a value has been explicitly set for it so that it can produce  correct XML. You also need to know it if a field is required but has no default  value.  If it hasn't been set, using the java default (i.e., 0 or 0.0  or false) could very likely be incorrect.  (And in any case should not  be assumed to be correct by Castor.)  Without the has method, the  generated validation code cannot tell the difference between, for  instance, that an int having been set to 0 and it having not been set  at all.  "Not having been set" is often an error that needs to be  caught. > The same problem will be there for any Java application, but I never  > had to add a special field for each primitive attribute in all my Java  > beans.  Different applications have different requirements.  Any application  should define some way to handle fields that aren't explicitly set.  In  Java, this usually takes the form of a documented default value.  For  Castor, that is not sufficient for the reasons described above. > Is this functionality needed for JDO? The has methods are not needed for JDO, but it will use them if they  are present.  Specifically, it will attempt to store NULL for a field  whose has method returns false. > If that is the case, is there any way of turning this off? If you really object to these methods, you can forestall their creation  by using Object wrappers for primitives instead of primitives.  See  http://castor.exolab.org/sourcegen.html#Maps-java-primitive-types-to- wrapper-object .  (I don't think this should be necessary.  If you  don't like'em, just don't use'em.) HTH, Rhett -- Rhett Sutphin Research Assistant (Software) Coordinated Laboratory for Computational Genomics    and the Center for Macular Degeneration University of Iowa - Iowa City - Iowa - 52246 mailto:[EMAIL PROTECTED] ----------------------------------------------------------- If you wish to unsubscribe from this mailing, send mail to [EMAIL PROTECTED] with a subject of:         unsubscribe castor-dev