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 33class 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