Re: [Simple-support] How to deserialize from a stream
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Re: [Simple-support] How to deserialize from a stream
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From: <Nia...@ub...> - 2008-09-09 10:58:59
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Hi,
Sorry, thought I had responded. Just do this.
Object o = persister.read(Object.class, inputSource);
Every object subclasses the object class, so the type in the XML will
match. It does not need to ignore.
Hope this helps,
Niall
-----Original Message-----
From: sim...@li...
[mailto:sim...@li...] On Behalf Of Tony
Thompson
Sent: 09 September 2008 11:52
To: gal...@ya...; sim...@li...
Subject: Re: [Simple-support] How to deserialize from a stream
Any input on this issue?
So, if I create the Strategy to write, how do I read the objects back,
persister.read( ????, input )? If the class= attribute is in the XML,
does the read() method ignore the type parameter? I am still confused
about that part, sorry.
Thanks for the detailed response.
Tony
-----Original Message-----
From: Niall Gallagher [mailto:gal...@ya...]
Sent: Thursday, September 04, 2008 3:31 AM
To: sim...@li...; Tony Thompson
Subject: Re: [Simple-support] How to deserialize from a stream
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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