Refactor JDOClassDescriptorFactory to work with new ClassInfo instances (using natures).

Patch contains the JDOClassDescriptorFactory that supports usage of Natures.
At this time is the factory capable to create JDODescriptors for Entity classes. Tests are also included.
There is no need of applying any other patches.

Just a few random observations:

a) you are using Java 5.0 code in at least one place (top of my head).
b) Your usage of natures is in some sense incorrect as you are not checking for the expected nature before actually looking at the *Info element(s).

Before trying to fix this, let me post an updated patch of your code which you can use to make the required changes. In addition, I have used Eclipse to make the code to comply with the CheckStyle rules of the project. As such, I would suggest to use my patch against a clean checkout.

I noted that the JDOClassDescriptorFactory prints DescriptorInstantiationException(..) to the generated JDODescriptors which is nowhere to be found. But the way this exception is initialized made me thinking if we really need it as it only "encapsulates" the message of another exception (e.g. a NoSuchMethodException) (which is - by the way - not a good idea). So we could either dump that exception all together or add the "true" exception by calling initCause(..) on the DescriptorInstantiationException before throwing it. What do you think?

I will commit a trimmed down version of the classes contained in this patch in a few minutes. Basically, here's what I am doing:

a) Commit the complete JDODescriptorJClass.
b) Commit parts of JDODescriptorClassFactory, without any code that creates the field descriptors.
c) Dropped all test cases.

Please SVN update and attach a patch that makes the remainder of the code available. Please do look into the issues mentioend above, especially Java 1.4 compliance and usage of natures.

JDOClassDescriptorFactory massive refactored.
ClassNatureCheck & FieldNatureCheck methods added.
Hope there is no java 1.5 code inside at the moment. If so, pls tell me where.
No other patches are needed to apply this patch, castor needs to be up to date.

Generating of the source for Descriptors with oneToOne relation added.
Unit test also included.
No additional patches needed to aply this one, but be sure you have the actual castor SVN checkout.
Generating oneToMany descriptors will be added later today.

This version of JDOClassDescrptorFactory supports also generating of 1:N Descriptors.
Unit tests included.
Apply the patch on the actual castor checkout.

I forgot, to apply this patch you need the CASTOR-2470

checkFieldInfoNatures method improved to check also JDOOneToOneNature and JDOOneToManyNature.

I attach the JDOClassDescriptorFactory.java in jira because of the problems by applying the latest patch to the ctual version of Cator.

What problems are you having, if I may ask ? And does the latest patch already include 1:M relations ?

JDOClassDescriptorFactory improved to create correct 1:N descriptors.
JDOClassDescriptorFactoryTest fixed.