1 #!/usr/bin/python 2 # Copyright (C) 2010 Google Inc. All rights reserved. 3 # 4 # Redistribution and use in source and binary forms, with or without 5 # modification, are permitted provided that the following conditions are 6 # met: 7 # 8 # * Redistributions of source code must retain the above copyright 9 # notice, this list of conditions and the following disclaimer. 10 # * Redistributions in binary form must reproduce the above 11 # copyright notice, this list of conditions and the following disclaimer 12 # in the documentation and/or other materials provided with the 13 # distribution. 14 # * Neither the name of Google Inc. nor the names of its 15 # contributors may be used to endorse or promote products derived from 16 # this software without specific prior written permission. 17 # 18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 """Package that private an array-based implementation of a stream.""" 31 32 33 class ArrayStream(object): 34 """Simple class that implmements a stream interface on top of an array. 35 36 This is used primarily by unit test classes to mock output streams. It 37 performs a similar function to StringIO, but (a) it is write-only, and 38 (b) it can be used to retrieve each individual write(); StringIO 39 concatenates all of the writes together. 40 """ 41 42 def __init__(self): 43 self._contents = [] 44 45 def write(self, msg): 46 """Implement stream.write() by appending to the stream's contents.""" 47 self._contents.append(msg) 48 49 def get(self): 50 """Return the contents of a stream (as an array).""" 51 return self._contents 52 53 def reset(self): 54 """Empty the stream.""" 55 self._contents = [] 56 57 def empty(self): 58 """Return whether the stream is empty.""" 59 return (len(self._contents) == 0) 60 61 def flush(self): 62 """Flush the stream (a no-op implemented for compatibility).""" 63 pass 64 65 def __repr__(self): 66 return '<ArrayStream: ' + str(self._contents) + '>' 67
