Re: Help with lookup

[email protected] wrote:

>I have a look (org/netbeans/modules/j2ee/deployment/impl/projects/J2eeModuleProjectLook) that adds a lookup.item to the project's lookup.
>
>I'd like Lookup.Item.getInstance() to be called lazily - ie only
>somebody actually interested in the particular lookup should cause the
>object that's very expensive to create to be created.
>  
>
You have to provide your own implementation of Lookup.Item which will 
create the instance lazily.

>Unfortunately, project open seems to call all the getInstances()
>multiple times (4-5 times).  For example, LookNode.getIcon() seems to
>ask for my lookup to be created.
>  
>
Yes, the lookup is created immediately when the LookNode is created 
(when the represented object is visualized), this is by design. As said 
before, you have to provide your own impl of Lookup.Item which you will 
return in J2eeMPL.getLookupItems and which will create the instance only 
when somebody will really need it (e.g. somebody will 
LookNode.getLookup().lookup(yourInst.class)). Do not use 
Lookups.lookupItem() in this case.

-vita