Fake.py
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00001 #! /usr/bin/python
00002 """
00003 Fake.py
00004 
00005 By Paul Malmsten, 2010
00006 pmalmsten@gmail.com
00007 
00008 Provides fake device objects for other unit tests.
00009 """
00010 import sys
00011 
00012 class FakeDevice:
00013     """
00014     Represents a fake serial port for testing purposes
00015     """
00016     def __init__(self):
00017         self.data = ''
00018     
00019     def write(self, data):
00020         """
00021         Writes data to the fake port for later evaluation
00022         """
00023         self.data = data
00024         
00025 class FakeReadDevice:
00026     """
00027     Represents a fake serial port which can be read from in a similar
00028     fashion to the real thing
00029     """
00030     
00031     def __init__(self, data, silent_on_empty=False):
00032         self.data = data
00033         self.read_index = 0
00034         self.silent_on_empty = silent_on_empty
00035         
00036     def read(self, length=1):
00037         """
00038         Read the indicated number of bytes from the port
00039         """
00040         # If too many bytes would be read, raise exception
00041         if self.read_index + length > len(self.data):
00042             if self.silent_on_empty:
00043                 sys.exit(0)
00044             else:
00045                 raise ValueError("Not enough bytes exist!")
00046         
00047         read_data = self.data[self.read_index:self.read_index + length]
00048         self.read_index += length
00049         
00050         return read_data
00051 
00052     def inWaiting(self):
00053         """
00054         Returns the number of bytes available to be read
00055         """
00056         return len(self.data) - self.read_index
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rosserial_xbee
Author(s): Adam Stambler
autogenerated on Wed Feb 6 2013 18:58:48