Re: [Simple-support] Controlling Depth of Serialization

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

Hi,

In the CycleStrategy you can keep track of the depth by using the serialization session map.

setElement(Class field, Object value, NodeMap node, Map map) 

A new map is created each time serialization is performed. Its used to store session data, which is also available in persister callbacks with @Commmit and @Validate. Anyway you could do this.


public boolean setElement(Class field, Object value, NodeMap node, Map map)
   Integer depth = (Integer) map.get("depth");
   if(depth == null) {
      depth = new Integer(0); 
   }
   map.put("depth", depth + 1);
   // etc....
}

This should work fine.
Niall


--- On Fri, 7/18/08, Karl Garske <kar...@gm...> wrote:

> From: Karl Garske <kar...@gm...>
> Subject: Re: [Simple-support] Controlling Depth of Serialization
> To: gal...@ya...
> Cc: sim...@li...
> Date: Friday, July 18, 2008, 8:53 PM
> Hi Niall,
> 
> So I've looked through CycleStrategy and I think I get
> the general idea of
> how it works.  Right now I'm focused on just
> serialization, so I'm working
> with setElement and setRoot. But I'm still unclear on
> how I can achieve
> tracking of depth with the information available to me in
> setElement.
> 
> CycleStrategy seems to keep track of the instances it has
> already seen. If
> found, it will only write a reference attribute, otherwise
> it writes all
> attributes of a node. DepthStrategy as I'm calling it
> would need to keep
> track of objects in a similar way, but it would also need
> to know what
> parent element it came from wouldn't it?
> 
> Also, in the example you provided I think you may have
> meant:
> 
> public Type getElement(....) {
>   if(depth++ > 2) {
>      return new EmptyType();
>   }
> 
> 
> On Thu, Jul 17, 2008 at 5:05 AM, Niall Gallagher
> <gal...@ya...>
> wrote:
> 
> > Hi,
> >
> > If you don't annotate the reference to C then it
> wont be serialized. There
> > is another way also. If you implement a Strategy you
> can return a Type such
> > that the Type.isReference == true then it wont
> serialize it. For instance in
> > your strategy implementation if you return the
> following.
> >
> > public Type setElement(....) {
> >   if(depth++ > 2) {
> >      return new EmptyType();
> >   }
> > }
> >
> > To see exactly what is involved in this look at the
> cycle strategy.
> > However, I think what you are looking for is a
> reference to C in B that is
> > not annotated. For example
> >
> >
> > @Root
> > public class A {
> >   @Element
> >   private B b;
> > }
> >
> > @Root
> > public class B {
> >   private C c;
> > }
> >
> > public class C {
> > }
> >
> > Here if you serialize A, only reference to b will be
> serialized. B's
> > reference to C will not be serialized as it is not
> annotated.
> >
> > Niall
> >
> > --- On Wed, 7/16/08, Karl Garske
> <kar...@gm...> wrote:
> >
> > > From: Karl Garske <kar...@gm...>
> > > Subject: [Simple-support] Controlling Depth of
> Serialization
> > > To: sim...@li...
> > > Date: Wednesday, July 16, 2008, 2:54 PM
> > > Hello, Is there any way to control the depth of
> > > serialization through
> > > something like the Persister? For example, my
> object graph
> > > might look
> > > something like A->B->C where A,B,C are
> objects and
> > > -> is the direction of
> > > reference. Is there a way to specify depth=2 and
> have it
> > > only serialize A
> > > and B, but not C? My apologies if this is
> documented
> > > somewhere, but I didn't
> > > see it in the tutorial.
> > >
> > >
> >
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