Re: [morph-user] How do I convert a Collection of objects?

[Matt S. <sga...@us...>]

Hello again Hernan,

I just took a look at the code that's in Morph 0.8.2, and the 
ContainerCopier should detect you are converting to a ChildDTO[] array 
and automatically do the conversion from a List or array of ChildDO 
objects.  It will delegate to the converter you specify as the 
nestedTransformer (that is a protected property of the underlying 
BaseTransformer that is made public in the ContainerCopier).  In Morph 
0.8.3, which I will release this weekend, that property has been renamed 
graphTransformer.  Also, in Morph 0.8.3 if you want to use an untyped 
collection, you can force a transformation to nested ChildDTO objects in 
your collection by populating the containedSourceToDestinationMapping 
property of the CollectionCopier.

As I mentioned in a previous post, I'll release Morph 0.8.3 this weekend :)

Matt

Hernan Silberman wrote:

>On Wed, 2 Mar 2005, Matt Sgarlata wrote:
>
>  
>
>>Hi Hernan, I'm glad you've found the package useful!
>>    
>>
>
>Sure, thanks for the quick response!
>
>  
>
>>If your destination ParentDTO exposes its children property as a 
>>ChildDTO[] array, I think Morph should detect that a conversion is 
>>necessary.  If you want to do the conversion to an untyped collection 
>>(e.g. - a List of ChildDTO), then you'll have to wait until the next 
>>release :)  I've actually already written the code that does this, I 
>>just haven't polished it into a release yet.  Can you use an array, or 
>>would you like me to do another release for you?
>>    
>>
>
>I can use an array, but do I need to write a new Converter to go from ChildDO[] 
>to ChildDTO[], or can I leverage the Converter I already have for going from 
>ChildDO to ChildDTO?
>
>Ultimately, I do want to be able to transform any graph to any other graph 
>including the untyped collections.  The source graph in my case is a Domain 
>Object Model which is persisted using Hibernate... so it heavily uses java.util 
>Collections to define relations.
>
>  
>
>>This past couple weeks I finally had a chance to use Morph with one of 
>>my own projects (we have an object graph generated by Hibernate that 
>>needs to be serialized and sent to a remote client using Hessian).  To 
>>accomplish this, I made all the necessary changes to allow cyclic graphs 
>>to be converted and to allow for more advanced collection 
>>transformations like the type you mention, Hernan.  I was aiming to do a 
>>release this weekend, but if anyone needs it sooner, I can certainly do 
>>my best to do a new release tomorrow.
>>    
>>
>
>I don't want to hurry you like that, I'm still only beginning to use the 
>framework so there's no rush.
>
>thanks again...
>Hernan
>
>
>  
>
>>Hernan Silberman wrote:
>>
>>    
>>
>>>Firstly, thanks for building Morph, I can tell it's going to save me tons of 
>>>time and many other people too.
>>>
>>>I'm just starting out with Morph and I have a simple question.  I have a 
>>>DelegatingTransformer configured in my code that knows all about the custom 
>>>transformers I've built.
>>>
>>>Now I'm building a new Transformer for a class ParentDO that has a collection of 
>>>ChildDO instances and a simple accessor method:
>>>
>>>public Collection getChildren();
>>>
>>>How do I tell Morph to convert all of the ChildDO objects in 
>>>someParent.getChildren() to some other type (ChildDTO)?
>>>
>>>Being overly simplistic about things, I'm looking for a method like this:
>>>Collection Morph.convert( DestinationDTO.class, Collection );
>>>
>>>Any help is much appreciated.
>>>
>>>thanks...
>>>hernan
>>>      
>>>
>
>
>
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