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Posted to dev@felix.apache.org by David Leangen <os...@leangen.net> on 2016/08/15 07:25:55 UTC

[Converter] DTO copies

Hi!

To put my question into context: on the bndtools list, I asked this question, and got this response Peter K.:

>> Is there a simple way to transform a DTO into an immutable value object?
> Not in enRoute and not in the new spec that was inspired by this service. In general you pass copies so they can do whatever they like with them.

Fine. But I am not seeing a simple way of creating such copy. Is there a “clone” method of some sort, or do I just convert an object to another object of its own type? Like this:

  MyDTO copy = cnv.convert( dto ).to( MyDTO.class );

If making copies is indeed how this service is intended to be used, it would be nice to have a more explicit method for this, maybe:

  MyDTO copy = cnv.copy( dto );

Or even this:

  MyDTO copy = cnv.clone( dto );


wdyt?


Cheers,
=David

Re: [Converter] DTO copies

Posted by David Leangen <os...@leangen.net>.

Thanks, David B.

=David


> On Aug 15, 2016, at 6:01 PM, David Bosschaert <da...@gmail.com> wrote:
> 
> Hi David,
> 
> Yes,
>    MyDTO copy = cnv.convert( dto ).to( MyDTO.class );
> will create a copy. Whenever a conversion is done to a key-value based type
> (map, dictionary, interface, annotation, JavaBean or DTO) the converter
> will create a copy which can be owned and possibly further modified by the
> caller.
> 
> I will certainly bring the idea of adding an explicit copy() method to the
> Converter design discussions at OSGi.
> 
> Cheers and thanks for the feedback!
> 
> David
> 
> 
> On 15 August 2016 at 08:25, David Leangen <os...@leangen.net> wrote:
> 
>> 
>> Hi!
>> 
>> To put my question into context: on the bndtools list, I asked this
>> question, and got this response Peter K.:
>> 
>>>> Is there a simple way to transform a DTO into an immutable value object?
>>> Not in enRoute and not in the new spec that was inspired by this
>> service. In general you pass copies so they can do whatever they like with
>> them.
>> 
>> Fine. But I am not seeing a simple way of creating such copy. Is there a
>> “clone” method of some sort, or do I just convert an object to another
>> object of its own type? Like this:
>> 
>>  MyDTO copy = cnv.convert( dto ).to( MyDTO.class );
>> 
>> If making copies is indeed how this service is intended to be used, it
>> would be nice to have a more explicit method for this, maybe:
>> 
>>  MyDTO copy = cnv.copy( dto );
>> 
>> Or even this:
>> 
>>  MyDTO copy = cnv.clone( dto );
>> 
>> 
>> wdyt?
>> 
>> 
>> Cheers,
>> =David
>> 
>> 
>>

Re: [Converter] DTO copies

Posted by David Bosschaert <da...@gmail.com>.

Hi David,

Yes,
    MyDTO copy = cnv.convert( dto ).to( MyDTO.class );
will create a copy. Whenever a conversion is done to a key-value based type
(map, dictionary, interface, annotation, JavaBean or DTO) the converter
will create a copy which can be owned and possibly further modified by the
caller.

I will certainly bring the idea of adding an explicit copy() method to the
Converter design discussions at OSGi.

Cheers and thanks for the feedback!

David


On 15 August 2016 at 08:25, David Leangen <os...@leangen.net> wrote:

>
> Hi!
>
> To put my question into context: on the bndtools list, I asked this
> question, and got this response Peter K.:
>
> >> Is there a simple way to transform a DTO into an immutable value object?
> > Not in enRoute and not in the new spec that was inspired by this
> service. In general you pass copies so they can do whatever they like with
> them.
>
> Fine. But I am not seeing a simple way of creating such copy. Is there a
> “clone” method of some sort, or do I just convert an object to another
> object of its own type? Like this:
>
>   MyDTO copy = cnv.convert( dto ).to( MyDTO.class );
>
> If making copies is indeed how this service is intended to be used, it
> would be nice to have a more explicit method for this, maybe:
>
>   MyDTO copy = cnv.copy( dto );
>
> Or even this:
>
>   MyDTO copy = cnv.clone( dto );
>
>
> wdyt?
>
>
> Cheers,
> =David
>
>
>