Re: [castor-user] [XML] Code Generation Creates Lots of Extra Classes

[Keith Visco]

Hi Rick,
Any chance you could make a dummied down version of the DTD available, 
I'd like to look into the problems with the Castor DTD converter.

Thanks,
--Keith
Rick Mangi wrote:
I love solving my own problems, thanks to the folks who offered to help, 
but I figured it out. Here's the deal for anyone else who encounters 
this oddity.

I created my schema by running the dtd through XMLSpy (I couldn't get 
the castor dtd converter to work, it complained about default 
namespaces. I saw a few postings about this but no solutions). Anyway, 
it did a decent job, but created a few odd bits of code... in particular:

   <xs:element name="REAgents">
       <xs:complexType>
           <xs:sequence maxOccurs="unbounded">
               <xs:element ref="REAgent"/>
           </xs:sequence>
       </xs:complexType>
   </xs:element>
This will cause REAgents.java to be created with an ArrayList of 
REAgentsItem objects which contain the REAgent objects.

Not what we want. In order to cause the REAgent objects to stored in the 
collection in REAgents you have to do this (which is what you would do 
by hand...)

   <xs:element name="REAgents">
       <xs:complexType>
           <xs:sequence>
               <xs:element ref="REAgent" maxOccurs="unbounded"/>
           </xs:sequence>
       </xs:complexType>
   </xs:element>
Basically, you have to move the multiplicity to the element, not the 
sequence. This is obvious now that I figured it out. So I've gone 
through the schema generated and fixed a bunch of this (along with some 
other really funky stuff...) and it looks great.

Hope this helps somebody else sometime.
Rick

Rick Mangi wrote:
Hey all, sorry if this is a newbie question. I've been using castor 
for a couple of weeks now and I like it a lot. I'm working with a very 
big XML Schema which I just ran through the code generation engine. 
The goal is to suck XML files in via Castor and then use Hibernate to 
put the data into oracle (ya, I know, but we already use hibernate, 
and it works).

The XML schema I'm using is big, and it generated a few hundred 
classes. That's fine. But what is confusing me is the "Item" classes. 
For example, this snippet:

<xs:element name="RETS">
      <xs:complexType>
          <xs:sequence minOccurs="0" maxOccurs="unbounded">
              <xs:element ref="REData"/>
          </xs:sequence>
      </xs:complexType>
  </xs:element>
  <xs:element name="REData">
      <xs:complexType>
          <xs:sequence>
              <xs:element ref="REProperties" minOccurs="0"/>
              <xs:element ref="REOffices" minOccurs="0"/>
              <xs:element ref="REAgents" minOccurs="0"/>
              <xs:element ref="REOfficeRosters" minOccurs="0"/>
              <xs:element ref="REProspects" minOccurs="0"/>
              <xs:element ref="REActivities" minOccurs="0"/>
              <xs:element ref="REHistories" minOccurs="0"/>
              <xs:element ref="REPublicRecords" minOccurs="0"/>
          </xs:sequence>
      </xs:complexType>
  </xs:element>
Generated (among others) a mapping class RETSItem.java which seems to 
just be a wrapper around the of REData objects. I'm not sure why this 
collection isn't just a part of the RETS.java object. RETS.java is now 
holding a collection of REItems which just has a single private field, 
_REData.

There are literally dozens of these classes generated, and they seem 
to serve no real purpose. I'm sure it makes the code generation 
easier, but its going to make mapping to the database a nightmare.

is there any way to turn off this holder-class generation?
Thanks in advance,
Rick


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