def init_context
@driver = driver
@control = page_option(:control)
@factory = page_option(:factory)
@filter_list = @control.filters
query_params = @driver.params
@filter_pos = query_params['pos']
@filter_type = query_params['filter']
@default_path = query_params['path'] || nil
if (mask_desc = query_params['mask']) then
mask_type, mask_value = mask_desc.split(/:/, 2)
@default_mask_type = mask_type || nil
@default_mask = mask_value || nil
else
@default_mask_type = nil
@default_mask = nil
end
@default_virtual_host = query_params['vhost'] || nil
end