Can I dynamically change the "defaultResolver"?

[Valerie Wagner]

It seems to me it should be simple to change what the "defaultResolver" 
is (as defined in the ivy setting files <settings> element), but I 
cannot find documentation on this.

We use a resolver chain that hits the local file system and a remote Ivy 
server. However, we occasionally build in restricted environments with 
no internet access, in which case we do not want the build system 
attempting to contact the Ivy server (as it causes the build to fail).

I've separated our resolves into "local" and "server" chains, with the 
default chain using both. However, I need my team to be able to specify 
that they use only the "local" resolver chain on occasion. (Assuming 
they have all the necessary libs from the server in their cache already.)

I think I could accomplish this by putting the local and server chains 
in separate ivy settings file, and switching which one is loaded at 
runtime, but this seems like a very roundabout way to do it. After all, 
the term "default" resolver implies to me there should also be a way to 
use an alternative, non-default resolver chain.

thanks,
Valerie