[Jboss-dev-forums] [Design of JBossXB] - Re: POJO Schema parsing

[<ad...@jb...>]

I've figured out what the problem is with the expression of the Map and Key/Value.
The issue is with the polymorphism, my attempts to reduce the
verbosity of the xml and the parsing API.

Essentially, the problem is that to get the polymorphism to work,
I have to introduce a type binding, in this case
key -> valueType
value -> valueType
where valueType can be collection/array/list/ANY/etc.

But this then requires an extra object to be constructed to model the polymorphic behaviour:


  |       // value binding
  |       TypeBinding valueType = schemaBinding.getType(valueTypeQName);
  | 
  |       configureValueBindings(valueType); // <------ subelements
  | 
  |       valueType.setHandler(new DefaultElementHandler()
  |       {
  |          public Object startElement(Object parent, QName name, TypeBinding type)
  |          {
  |             return new AbstractValueMetaData(new StringValueMetaData());
  |          }
  | etc.
  | 

Then later I have to unwrap the extra AbstractValueMetaData

  |             AbstractMapMetaData map = (AbstractMapMetaData) parent;
  |             MapEntry entry = (MapEntry) child;
  |             AbstractValueMetaData entryKey = (AbstractValueMetaData) entry.key;
  |             if (entryKey == null)
  |                throw new IllegalArgumentException("No key in map entry");
  |             AbstractValueMetaData entryValue = (AbstractValueMetaData) entry.value; 
  |             if (entryValue == null)
  |                throw new IllegalArgumentException("No value in map entry");
  |             map.put(entryKey.getValue(), entryValue.getValue());
  | 

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