Re: How to call createObject from within an OzoneObject?

On Sat, 2004-05-08 at 18:41, Arjen van der Meijden wrote:
> Hi list,

:-)

> I've been playing around with Ozone, but ran into a small problem:
> When I create an Object via database.createObject and that newly created 
> object wants to create another OzoneObject (say an OzoneMap), that fails 
> in my current code.

What do you mean with 'it fails'? Does it throw an exception?

> Below in the example-code is a marker, and there the code fails, the 
> Ozone-database doesn't know about any OzonePlugIn (actually it is the 
> org.apache.struts.plugin.PlugIn it doesn't know about).
> But even if this code would work, my object would reference the database 
> "it is being created in" via some external, client-side, reference...

Why do you want to go through an extra class (OzoneAccess) from within
an ozone object (FooImpl), when you can simply use this.database() from
within an ozone object? (btw: you cannot create an ozone object from
within an ozone object ctor; the FAQ has more on this)

> So, what is the best way to retrieve some local reference, to the 
> database the object is being created in and use that reference to create 
> member-objects?

As said, this.database().

(...)
>    private static ExternalDatabase db;
(...)
>    public void init()
>    {
>      db = ExternalDatabase.openDatabase(...);
>    }

Initializing a static class variable within a non-static method without
any == null test? No wander we guys from Leiden call you guys from Delft
'fietsenmakers'. ;-)

Mzzl,
Leo
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