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comparison plugins/cherrypy/lib/aspect.py @ 0:4385a7d0efd1 grumpy-goblin

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Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
author sirebral
date Tue, 14 Jul 2009 16:41:58 -0500
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-1:000000000000 0:4385a7d0efd1
1 """
2 Copyright (c) 2004, CherryPy Team (team@cherrypy.org)
3 All rights reserved.
4
5 Redistribution and use in source and binary forms, with or without modification,
6 are permitted provided that the following conditions are met:
7
8 * Redistributions of source code must retain the above copyright notice,
9 this list of conditions and the following disclaimer.
10 * Redistributions in binary form must reproduce the above copyright notice,
11 this list of conditions and the following disclaimer in the documentation
12 and/or other materials provided with the distribution.
13 * Neither the name of the CherryPy Team nor the names of its contributors
14 may be used to endorse or promote products derived from this software
15 without specific prior written permission.
16
17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
18 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
21 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
24 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 """
28
29 # return codes for _before and _after aspect methods
30 STOP = 0
31 CONTINUE = 1
32
33 class Aspect(object):
34 """
35 Base class for aspects. Derive new aspect classes from this, then
36 override one or both of _before and _after.
37 """
38
39 def __getattribute__(self, methodName):
40
41 # find method specified by methodName
42 try:
43 method = object.__getattribute__(self, methodName)
44 except:
45 raise
46
47 # if requested attribute is not a method, simply return it
48 if not callable(method):
49 return method
50
51 # define wrapper function
52 def _wrapper(*k, **kw):
53 # call _before method
54 status, value = object.__getattribute__(self, '_before')(methodName, method)
55 if status == STOP:
56 return value
57
58 # call wrapped method and append results
59 result = method(*k, **kw)
60 if value:
61 result = value + result
62
63 # call _after method
64 status, value = object.__getattribute__(self, '_after')(methodName, method)
65 if status == STOP:
66 return value
67 if value:
68 result += value
69
70 # done!
71 return result
72
73 # expose wrapper function if wrapped method is exposed
74 if getattr(method, 'exposed', None):
75 _wrapper.exposed = True
76
77 # return wrapper function. It'll get called instead of the
78 # requested method.
79 return _wrapper
80
81
82 def _before(self, methodName, method):
83 return CONTINUE, None
84
85
86 def _after(self, methodName, method):
87 return CONTINUE, None