Gets the interface corresponding to the specified full name.

        :arg fullname: a string with modulename.interface.

def get_interface(self, fullname):
        """Gets the interface corresponding to the specified full name.

        :arg fullname: a string with modulename.interface.
        """
        result = None
        [modname, iname] = fullname.split(".")
        module = self.get(modname)
        if module is not None:
            if iname in module.interfaces:
                result = module.interfaces[iname]
        return result