def allow(self, line, handle, item, port=None):
"""
Glue line's handle to an item.
If port is not provided, then first port is used.
"""
if port is None and len(item.ports()) > 0:
port = item.ports()[0]
adapter = IConnect(item, line)
return adapter.allow(handle, port)
def allow(self, sink):
adapter = IConnect(sink.item, self.item)
return adapter and adapter.allow(self.handle, sink.port)