/**
* Calculates the connectionState resulting from the message in the current connection state.
* Checks if the specified message is allowed in the connection's state and throws an exception if
* not.
*
* @param con
* @param msg
* @return
* @throws won.protocol.exception.IllegalMessageForConnectionStateException if the message is not
* allowed in the connection's current state
*/
private ConnectionState performStateTransit(Connection con, ConnectionEventType msg)
throws IllegalMessageForConnectionStateException {
if (!msg.isMessageAllowed(con.getState())) {
throw new IllegalMessageForConnectionStateException(
con.getConnectionURI(), msg.name(), con.getState());
}
return con.getState().transit(msg);
}