Re: AW: [castor-user] Re: Preserving Unmarshall Sequence

Wed, 30 May 2007 09:23:24 -0700

This worked...somewhat. Order was preserved, but the resulting XML did not retain the original element tag names. Input XML 
<application_window id="1000">
 <field id="1002" is_multiline="yes">
    <pos x="100" y="120"/>
    <size h="400" w="300"/>
  </field>
   <label id="1005">
         <pos x="100" y="130"/>
         <size w="30" h="10"/>
         <text>This is a label</text>
   </label>
<application_window> Mapping 
<class name="model.ApplicationWindow">
        <field name="controls" type="model.GeneralControl" collection="vector">
                <bind-xml node="element"/>
        </field>
</class>
<class name="model.GeneralControl">
</class>
<class name="model.Label"  extends="model.GeneralControl">
        <field> ...field definitions
</class>
<class name="model.Field"  extends="model.GeneralControl">
        <field> ...field definitions
</class> Resulting XML file: 
<application_window id="1000">
      <controls xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
id="1002" enabled="yes" visible="yes" is_editable="yes" xsi:type="field"> 
          <pos x="100" y="120"/>
          <size h="400" w="300"/>
      </controls>
      <controls xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
          id="1005" enabled="yes" visible="yes" xsi:type="label">
          <pos x="100" y="130"/>
          <text>This is a label</text>
          <size h="10" w="30"/>
      </controls>
</application_window> 


Does this mean I must use XSLT to get the proper output? 




Ralf Joachim writes: 


Hi Justin, 

as Castor supports inheritance and all your components have a common base 
class it should be possible to put them all into one collection. You need 
to do: 


- define a mapping of your base class, let's call it Component
- define in mapping that your Button, Label, and so on extend Component
  <class name="Button" extends="Component">

- define that your collection holds Components 


Hope this helps

Ralf 



[EMAIL PROTECTED] schrieb:

If that behavior is true for collections, then is there a way to map 
different elements to the same collection - in my case, put a button, 
label, etc. into  the same vector within a containing class (they all 
inherent from the same base class)?  That would solve my problem. 
However, it does not seem that Castor supports this.

Thank you for all the responses!
Justin
Werner Guttmann writes:

Ralf,

I am not 100% sure how Castor behaves in such a case. I think it will 
depend on whether somebody is using a mapping file or working off a set 
of generated classes. In the latter case, things will be marshalled out 
corresponding the order in which they have been defined as part of the 
<xsd:sequence> declaration (and as of 1.1.1, a sequence order check will 
be performed during unmarshalling).
In the former case, when a mapping file is used, the elements of a class 
will me marshaled in the sequence the field mappings have been defined 
in the mapping file, as the XMLMappingLoader uses exactly this sequence 
to inject the field descriptors into the class descriptor at runtime.
For collections, I think the elements will be marshalled out in exactly 
the sequence they appear in the collection (which is the one that should 
have been built during unmarshalling).

I hope this makes things a bit clearer.
Werner

-----Ursprüngliche Nachricht-----
Von: Ralf Joachim [mailto:[EMAIL PROTECTED]
Gesendet: Mittwoch, 30. Mai 2007 11:28
An: [email protected]
Betreff: Re: [castor-user] Re: Preserving Unmarshall Sequence
Hi Werner,
I think it is reasonable to expect Castor to marshal objects in a
collection/list in the sequence they are contained in the list and do
not reorder them in any way.
If this isn't possible yet, I think this should be added and be
configured to be the default behaviour at least for introspection and
when using mapping.
Regards

Ralf 


Werner Guttmann schrieb:
> Within Castor, other than using multiple mapping files (with each of
> them specifying the required sequence of fields), no.
>

> And with regards to abandoning Castor, I know that e.g. JAXB allows 
you
> to define one sequence only (by the means of a JAXB annotation), and 
not

> multiple ones.
>
> If I were you, I'd consider using XSLT (whether manually or within a

> framework such as Cocoon) on top of Castor, to sort the original 
output

> according to your specific needs. Castor's Marshaller supports
> marshalling to SAX events, which could be directly feed into e.g. a
> Cocoon pipeline or a JAXP transformer.
>
> Regards
> Werner
>
> [EMAIL PROTECTED] wrote:

>> The sequence could be different each time - the xml document 
describes

a

>> gui , and the order in which the elements appear in the file 
determines
>> the tab order in the legacy system, hence the requirement to 
marshall

>> objects in a particular sequence.

>> So, in one file, the order may need to be label, button, field, 
field,

>> but in another it could be field, button, field, button, and so on.

>> Is there any solution to this? Or do I need to abandon Castor - 
which

>> would be a shame.
>>
>> Werner Guttmann writes:

>>> How about trying to match the sequence of your field mappings in 
the

>>> mapping file to the expected sequence ? If you use a mapping file,
>>> Castor simply marshalls fields as encountered in the mapping file.
>>> Werner
>>> [EMAIL PROTECTED] wrote:

>>>> Can Castor preserve the sequence of elements it unmarshalls when 
it

goes
>>>> to marshall things back up?
>>>> Example:
>>>> XML going in..
>>>> <window>
>>>>  <button> Button1 </button>
>>>>  <label> Label1 </label>
>>>>  <button> Button2 </button>
>>>> </window>
>>>> XML going out
>>>> <window>
>>>>  <button> Button1 </button>
>>>>  <button> Button2 </button>
>>>>  <label> Label1 </label>
>>>> </window>
>>>> When being marshalled back up, Castor will group all the buttons

>>>> together, labels, etc. in the order as defined by the mapping 
file.
>>>> However, for reasons that are beyond my control, I need to be able 
to
>>>> write out the XML file in the same order that I read it in. I 
tried

>>>> putting all elements in a single vector, but I get an error
complaining
>>>> of multiple instances of the same field in the mapping file.
>>>> Any suggestions?
>>>> Thank you,
>>>> Justin

>>>> 
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--  


Syscon Ingenieurbüro für Meß- und Datentechnik GmbH
Ralf Joachim
Raiffeisenstraße 11
72127 Kusterdingen
Germany
Tel.   +49 7071 3690 52
Mobil: +49 173 9630135
Fax    +49 7071 3690 98
Internet: www.syscon.eu
E-Mail: [EMAIL PROTECTED]
Sitz der Gesellschaft: D-72127 Kusterdingen
Registereintrag: Amtsgericht Stuttgart, HRB 382295
Geschäftsleitung: Jens Joachim, Ralf Joachim
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--  


Syscon Ingenieurbüro für Meß- und Datentechnik GmbH
Ralf Joachim
Raiffeisenstraße 11
72127 Kusterdingen

Germany 


Tel.   +49 7071 3690 52
Mobil: +49 173 9630135

Fax    +49 7071 3690 98 


Internet: www.syscon.eu

E-Mail: [EMAIL PROTECTED] 


Sitz der Gesellschaft: D-72127 Kusterdingen
Registereintrag: Amtsgericht Stuttgart, HRB 382295

Geschäftsleitung: Jens Joachim, Ralf Joachim 


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