Thomas:
Thanks for your reply.
I am already at version 1.17 of
AbstractPersistentField .
I have already tried overriding computeField(), and in
it calling AbstractPersistentField.computeField(); I
catch the MetadateException and then try to replace
the interface Class with an actual implementer Class.
The problem is that the interface Class I need to
replace is not the one I pass in to computeField(),
but the one that is the next level down (in the
recursion chain). This is done in the private
methods, and so I have no way to modify that behavior.
Am I explaining this in such a way as to make the
problem clear? If methods getFieldRecursive() and
getNestedFieldRecursive() were protected, I could
modify them and substitute my implementer Class for
the interface Class when needed...
The actual exception thrown is originally a
NoSuchFieldException thrown from getFieldRecursive().
Gary
--- Thomas Dudziak <[EMAIL PROTECTED]> wrote:
> On Tue, 30 Mar 2004, Gary wrote:
>
> > I am wondering why the methods getFieldRecursive()
> and
> > getNestedFieldRecursive() in class
> > AbstractPersistentField are private. I would like
> to
> > have the ability to override them in a custom
> > persistent field implementation.
> >
> > Here is my dilemma:
> >
> > I have the following classes:
> >
> > package ojb;
> >
> > public interface IParent {
> > IChild getChild();
> > void setChild(IChild child);
> > }
> >
> > package ojb;
> >
> > public interface IChild {
> > String getDescription();
> > void setDescription(String description);
> > }
> >
> > package ojb;
> >
> > public class Parent implements IParent {
> > private IChild child = null;
> >
> > public Parent() {
> > super();
> > }
> >
> > public IChild getChild() {
> > return child;
> > }
> >
> > public void setChild(IChild child) {
> > this.child = child;
> > }
> >
> > }
> >
> > package ojb;
> >
> > public class Child implements IChild {
> > private String description = null;
> >
> > public Child() {
> > super();
> > }
> >
> > public String getDescription() {
> > return description;
> > }
> >
> > public void setDescription(String string) {
> > description = string;
> > }
> >
> > }
> >
> >
> >
> > I have the following OJB metadata.
> > <field-descriptor
> > name="child::description"
> > column="childDescription"
> > jdbc-type="VARCHAR"
> > />
> >
> > I am using a subclass of
> > PersistentFieldIntrospectorImpl. The problem is
> that
> > when it tries to resolve “child::description,” it
> ends
> > up going through the “IChild getChild()” method
> > signature. This causes it to analyze the fields
> of
> > IChild; of course there aren’t any, so it fails
> with a
> > MetadataException.
> >
> > If I could override methods getFieldRecursive()
> and
> > getNestedFieldRecursive(), I could substitute at
> run
> > time a class that implements IChild.
> >
> > Any ideas? I really need to return a reference to
> an
> > interface here, rather than to a concrete class,
> as
> > our design is heavily interface based.
>
> Have you tried the CVS version ? I made some changed
> that may be of
> interest to you:
>
> * methods getFieldRecursive and
> getNestedRecursiveField are static and,
> though still private, you can use them via the
> protected static method
> computeField in AbstractPersistentField
>
> * I fixed getFieldRecursive such that it no longer
> throws an exception
> when given an interface
>
> * support for interfaces in the repository
> descriptor is now much
> better; specifically using
> PersistentFieldIntrospectorImpl
> (bean-access) or PersistentFieldAutoProxyImpl
> (detects access method
> automatically - best for mixing concrete classes and
> interfaces) should
> work much better now
>
> Perhaps you could try the CVS version with the
> unmodified
> PersistentFieldIntrospectorImpl, and if you still
> have problems, then
> please post the stacktrace ?
>
> Tom
>
>
>
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