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#!/usr/bin/python
# Copyright (C) 2010 Google Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Package that private an array-based implementation of a stream."""
class ArrayStream(object):
"""Simple class that implmements a stream interface on top of an array.
This is used primarily by unit test classes to mock output streams. It
performs a similar function to StringIO, but (a) it is write-only, and
(b) it can be used to retrieve each individual write(); StringIO
concatenates all of the writes together.
"""
def __init__(self):
self._contents = []
def write(self, msg):
"""Implement stream.write() by appending to the stream's contents."""
self._contents.append(msg)
def get(self):
"""Return the contents of a stream (as an array)."""
return self._contents
def reset(self):
"""Empty the stream."""
self._contents = []
def empty(self):
"""Return whether the stream is empty."""
return (len(self._contents) == 0)
def flush(self):
"""Flush the stream (a no-op implemented for compatibility)."""
pass
def __repr__(self):
return '<ArrayStream: ' + str(self._contents) + '>'
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