related to SF 3093882, raise an exception when open() is called twice, also add unit test for this

git-svn-id: http://svn.code.sf.net/p/pyserial/code/trunk/pyserial@392 f19166aa-fa4f-0410-85c2-fa1106f25c8a

1 files changed, 2 insertions, 0 deletions

diff --git a/serial/serialjava.py b/serial/serialjava.py
index 2541534..1993ee9 100644
--- a/serial/serialjava.py
+++ b/serial/serialjava.py
@@ -58,6 +58,8 @@ class JavaSerial(SerialBase):
            if the port cannot be opened."""
         if self._port is None:
             raise SerialException("Port must be configured before it can be used.")
+        if self._isOpen:
+            raise SerialException("Port is already open.")
         if type(self._port) == type(''):      # strings are taken directly
             portId = comm.CommPortIdentifier.getPortIdentifier(self._port)
         else: