[castor-dev] How to specify an array collection in a derived class descriptor

[Doyle, Joe]

I'd like to unmarshall a class that has a couple of arrays as fields, and
I'm 99% certain a custom class descriptor is required.

A snippet from the class:

public final class PointSectionUnion
        implements org.omg.CORBA.portable.IDLEntity
{
        private com.gcmtravel.LinearLocationType discriminator;
        private com.gcmtravel.SectionLocationProfile[] section;
        public PointSectionUnion ()     {       }

        public com.gcmtravel.SectionLocationProfile[] section ()
        {
                if( discriminator !=
com.gcmtravel.LinearLocationType.SECTION_LINEAR)
                        throw new org.omg.CORBA.BAD_OPERATION();
                return section;
        }

        public void section (com.gcmtravel.SectionLocationProfile[] _x)
        {
                discriminator =
com.gcmtravel.LinearLocationType.SECTION_LINEAR;
                section = _x;
        }

.......

the fact that section() will throw if discriminator isn't SECTION_LINEAR
leads me to believe a custom class descriptor is required.

But that's beside the point. Here's the class descriptor I've come up with
so far:

public class PointSectionUnionDescriptor
    extends XMLClassDescriptorImpl
{
    public PointSectionUnionDescriptor() {
        super(com.gcmtravel.PointSectionUnion.class,
"pointLocationProfile");

        XMLFieldDescriptorImpl contentDescriptor =
            new
XMLFieldDescriptorImpl(com.gcmtravel.PointLocationProfile.class,
                                       "point", "point", NodeType.Element);
        contentDescriptor.setHandler(new PointFieldHandler());
        addFieldDescriptor(contentDescriptor);

        contentDescriptor =
            new
XMLFieldDescriptorImpl(com.gcmtravel.SectionLocationProfile.class,
                                       "section", "section",
NodeType.Element);
        contentDescriptor.setHandler(new SectionFieldHandler());
        addFieldDescriptor(contentDescriptor);
    }
.......

This works fine for marshalling-if the PointSectionUnion happens to have
multiple sections, multiple <section> elements are marshalled.

However, when unmarshalling, an error is thrown after the second point is
unmarshalled-

ValidationException: element "point" occurs more than once.
(XMLFieldDesciptor:
point AS point){file: [not available]; line: 115; column: 33}
ValidationException: element "point" occurs more than once.
(XMLFieldDesciptor:
point AS point)
        at org.exolab.castor.xml.UnmarshalHandler.endElement(Unknown Source)

I've tried a few different things, such as setContainer(true) and using
"com.gcmtravel.SectionLocationProfile[].class", but those just cause
problems somewhere else.

Can someone point out the right way to specify an array collection in a
custom class descriptor?

Thanks,
Joe

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