Re: question on object that extends AbstractList<E>

Friday, April 16, 2010, 7:31:19 PM, jake ochs wrote:

> I have a custom object that extends AbstractList<E>  (E, in my case, is
> a Lotus Notes Document object wrapper.) I also want to implement methods
> in my custom object that return SimpleSequence values. i.e., in addition
> to requesting of my object an element in the AbstractList of Notes 
> Documents I want to ask the object to lookup specific values and return
> them as SimpleSequences. The problem is that when trying to access the
> methods from FTL, I throw the error "Expected hash. <<objectname>> 
> evaluated instead to freemarker.template.SimpleSequence..." How do I 
> work around this?

The default backward-compatible object wrapper doesn't expose the
methods of objects unless it doesn't recognize any of their
interfaces... That's so because originally the methods wasn't exposed
for anything (as there was no automatic object-wrapping either). So,
you could switch to freemareker.ext.beans.BeansWrapper... where you
setup FM do:

  BeansWrapper wrapper = new BeansWrapper();
  wrapper.setSimpleMapWrapper(true);
  cfg.setObjectWrapper(wrapper);

Now that's not totally backward-compatible, but in practice it's 99%
that, I think... The problem could be mostly only that it doesn't
automatically wrap XML and Jython objects.

(We really should introduce a BeansWrapper that represents the
best-practice, and that later can become the default... BeansWrapper
doesn't as it has SimpleMapWrapper set to false by default, and it
doesn't wrap XML (nor Jython).)

-- 
Best regards,
 Daniel Dekany


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