Re: [Simple-support] Beginner Question

[Niall G. <gal...@ya...>]

Hi,

With regard to why I have kept the default strategy private, I am intending on writing an additional package to make it easy to write strategies. This would make it easier to modify the generated XML as it is being serialized and deserialized. I hope to get around to this shortly.

Niall


--- On Fri, 6/13/08, Graham Stewart <gr...@mo...> wrote:

> From: Graham Stewart <gr...@mo...>
> Subject: Re: [Simple-support] Beginner Question
> To: gal...@ya...
> Cc: "Timo Rumland" <cr...@ol...>, sim...@li...
> Date: Friday, June 13, 2008, 4:13 PM
> Thanks Niall,
> 
> That worked well.
> 
> Unfortunately the DefaultStrategy references a number of
> non-public
> classes so i started out having to copy things like
> ArrayType and
> ClassType into my own project space.
> 
> In the end I went ahead and changed DefaultStrategy to be a
> public
> class so I could make my custom Strategy extend it. This
> makes my own
> project code much neater at the expense of having a custom
> version of
> the simple jar.
> 
> Is there a rationale for keeping DefaultStrategy private?
> 
> regards,
> Graham
> 
> 
> 
> On Thu, Jun 12, 2008 at 11:25 AM, Niall Gallagher
> <gal...@ya...> wrote:
> > Hi,
> >
> > Well the issue exists only for the root class. The
> root element does not use the class attribute by default.
> So if you had:
> >
> > @Blah
> > public class Blah {
> >   @Element
> >   private TaskInterface task;
> > }
> >
> > Then serialization would have:
> >
> > <blah>
> >   <task class="com.package.MyTask"
> etc.....>
> >      etc....
> >   </task>
> > </blah>
> >
> > However because you want the root element to contain
> the class here is what you can do. If you have the source
> code to simple, which is available in the download you will
> see the DefaultStrategy.java object in the package
> org/simpleframework/http/load package. You need to take
> this source code to build your own strategy. In your
> strategy you would re-implement the setRoot method to look
> like this.
> >
> >   public boolean setElement(Class field, Object value,
> NodeMap node, Map map){
> >     boolean result = setElement(field, value node,
> map);
> >
> >     node.put(label, value.getClass().getName());
> >     return result;
> >   }
> >
> > This will ensure that each time you write an object,
> the root element will always use the class= attribute. Or
> course you can be more intelligent than this, and decide
> when you want the class= attribute and when you do not.
> >
> > Hope this helps,
> > Niall
> >
> > --- On Tue, 6/10/08, Graham Stewart
> <gr...@mo...> wrote:
> >
> >> From: Graham Stewart
> <gr...@mo...>
> >> Subject: Re: [Simple-support] Beginner Question
> >> To: "Timo Rumland"
> <cr...@ol...>
> >> Cc: sim...@li...
> >> Date: Tuesday, June 10, 2008, 4:43 PM
> >> On Tue, Jun 10, 2008 at 3:59 PM, Timo Rumland
> >> <cr...@ol...> wrote:
> >> > Hello Graham,
> >> >
> >> >> But if I omit the class attribute then
> this:
> >> >
> >> >> TaskInterface o =
> >> serializer.read(TaskInterface.class,
> "<task1
> >> >> a=\"14\"
> >> b=\"13\"/>>");
> >> >> will fail with
> >> >
> >> > you want to get a TaskInterface, which is
> apparently
> >> an interface,
> >> > returned by the serializer. This is possible
> only if
> >> the serializer
> >> > knows what implementation to instantiate. If
> you have
> >> no "class"
> >> > parameter in the XML, how can the serializer
> know
> >> which class to
> >> > instantiate (you can't instantiate an
> interface)?
> >>
> >> Right, i entirely expect to have to provide the
> class
> >> attribute when
> >> i'm deserializing to an interface.
> >>
> >> How do i get the serializer to put it there?
> >>
> >> If i have
> >>
> >> TaskInterface myTask = new Task1(14,13);
> >> myPersister.write(myTask, "output.xml");
> >>
> >> then it writes out the xml without the class
> attribute, so
> >> I end up with:
> >>
> >> <task1 a="14" b="13"/>
> >>
> >> instead of what I really want, which is:
> >>
> >> <task1
> class="com.company.om.tasks.Task1"
> >> a="14" b="13"/>
> >>
> >>
> >> Does that make sense?
> >> How do I get Persister.write() to include the
> class
> >> attribute?
> >>
> >>
> >> thanks again,
> >> Graham
> >>
> >>
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