Re: hash & sequence

On Thu, Feb 12, 2009 at 9:30 PM, dirk ooms <[email protected]> wrote:
> Hello,
>
> I have data that is stored in a LinkedHashMap, so it has both a hash and
> a sequence nature. I would like to address this data in a Freemarker
> template in both its natures. In an attempt to achieve this, I created
> my own class that extends LinkedHashMap and that provides the sequence
> interface methods (get(int) and size()). But when I try to use it in the
> <#list> construct Freemarker says:
>
> Expected collection or sequence. a.b.c evaluated instead to
> freemarker.template.SimpleHash
>
> So it does not recognize it as a sequence. Is there a way I can use my
> LinkedHashMap in a <#list>?

There are two potential answers:

First, if you want fine control over the access methods (i.e.
implement them yourself) you can explicitly implement the interfaces
TemplateHashModelEx and TemplateSequenceModel in your subclass.

Second (and this is probably the better first-pass answer)  if you
don't want to do that, and just use the automatic BeansWrapping
machinery, it should work, you just write:

<#list linkedHashMap?keys as key>....</#list>

or

<#list linkedHashMap?values as value>...</#list>

depending on whether you want to iterate over the keys or values of
course. And the order (unlike with a regular HashMap) should be
maintained, I think.

JR

>
> Thanks,
>
> dirk
>
>
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