Re: Does FM support varargs or arrays in method calls?

Thursday, December 6, 2007, 9:43:28 AM, Attila Szegedi wrote:

> We've added vararg handling to 2.4 (which is not yet released).  
> There's currently no vararg handling in 2.3. Can you try using 2.4?  
> You can grab the latest 2.4 build from here:

That I don't recommend, as it is not stable.

> - go to <http://freemarker.org:8085/browse/FM-TRUNK/latest>
> - click "Artifacts" tab
> - download the freemarker.jar behind the "Library" link
>
> Failing that, I can backport vararg handling to 2.3.x branch.
>
> Attila.
>
> On 2007.12.05., at 23:17, Newman, John W wrote:
>
>> Hi,
>>
>> This is interesting, I might be in trouble here – hopefully I’m just  
>> missing something.   Consider this,
>>
>> class WrappedObject  {
>>      public <E extends Entity> java.util.List<E>  
>> findByNamedQuery(Class<E> entityClass,
>>                  String query, Object... queryParams) {
>>            return entityManager.findByNamedQuery(entityClass, query,  
>> queryParams);
>>      }
>> }
>>
>>
>> class EntityManager  {
>>      public <E extends Entity> java.util.List<E>  
>> findByNamedQuery(Class<E> entityClass,
>>                  String query, Object... queryParams) {
>>            // do hibernate stuff here
>>      }
>> }
>>
>>
>> [#assign results = wrappedObject.findByNamedQuery(${class},  
>> “findByFirstAndLastName”, [“John”, “Smith”]) /]
>>
>> Should work right?
>>
>> : freemarker.template.TemplateModelException: No signature of method  
>> findByNamedQuery matches  
>> (java 
>> .lang.Class,java.lang.String,freemarker.ext.beans.SequenceAdapter)
>>
>> If I forget about the varargs and change the wrapped objects method  
>> to use Object[] queryParams, I get the exact same exception.   
>> However if I change it to List<Object>, [“John”, “Smith”] matches  
>> the rule, and the method gets invoked.
>>
>> That’s ok, but I can’t change the API of the EntityManager class –  
>> we’re stuck with varargs there.  So,
>>
>>
>> class WrappedObject  {
>>      public <E extends Entity> java.util.List<E>  
>> findByNamedQuery(Class<E> entityClass,
>>                  String query, List<Object> queryParams) {
>>            return entityManager.findByNamedQuery(entityClass, query,  
>> queryParams == null ? queryParams : queryParams.toArray(new  
>> Object[queryParams.size()]));
>>      }
>> }
>>
>> I really thought that would work.  Unfortunately, all it does is  
>> pass in 1 parameter to entityManager’s method, an Object[] – not  
>> Object, Object.  Interesting.  Any ideas?  Is there different syntax  
>> for arrays & lists?
>>
>> Any help is greatly appreciated.
>>
>> Thanks,
>> john
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>
> Attila.
>
> --
> home: http://www.szegedi.org
> weblog: http://constc.blogspot.com
>
>
>
>
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-- 
Best regards,
 Daniel Dekany


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