Re: [Simple-support] How to deserialize from a stream

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

Hi,

Yes you can, with a strategy. Currently I do not support top level class="some.class.Name" attributes. The reason is because class= attributes are only written when the expected type is a subclass of the type. I should really add a method such as.

Persister.write(Object value, Class expect, OutputStream out);

Then you could write.

persister.write(value, Object.class, out);

Resulting in a class= attribute at the top leven. However, you can still do this if you like. Create a strategy like so.

public class MyStrategy implements Strategy {

private final Strategy strategy;

public MyStrategy(Strategy strategy){
  this.strategy  = strategy;
}   	

public boolean setRoot(Class field, Object value, NodeMap node, Map map){
  return strategy.setRoot(Object.class, value, node, map);    
}   
}

And create it like so:

Strategy main = new DefaultStrategy();
Strategy mine = new MyStrategy(main);
Persister persister = new Persister(mine);

Then you will see top leven class= attributes. Note though you will have to make org.simpleframework.xml.load.DefaultStrategy public. It is currently package protected. I will make it public in the next release as it really is needed to do most non-standard things with simple. Hope this works, if it does not let me know.

A good starting point for learning what the Strategy is, is the javadoc, tutorial, and the unit tests which come with the download.

Regards,
Niall

 

--- On Wed, 9/3/08, Tony Thompson <Ton...@st...> wrote:

> From: Tony Thompson <Ton...@st...>
> Subject: [Simple-support] How to deserialize from a stream
> To: sim...@li...
> Date: Wednesday, September 3, 2008, 10:35 AM
> I was able to serialize several objects to an output stream
> but now I
> would like to stream them back.  There are too many objects
> to load them
> all into memory at once.  It looks the Persister.read()
> method will work
> but, I have to pass in the object type that I am reading. 
> I don't know
> what the type of the next object is because I have several
> different
> object types written to the XML file.  Is there a way to
> stream each
> object back (one object in memory at a time) without
> knowing the object
> type ahead of time?
>  
> I was able to serialize/deserialize all of my objects when
> I put them in
> a wrapper object and used @ElementList but, that requires
> they are all
> in memory at the same time so it really doesn't help
> me.  Any other
> input would be helpful.
>  
> Thanks.
> Tony
>  
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