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