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annotate pyloader/factory.py @ 14:30979d82c95d

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remove silly self-reference code for now
author Jeff Hammel <jhammel@mozilla.com>
date Fri, 27 May 2011 18:43:14 -0700
parents ff272dcd5cd8
children 0bea5297c156
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1 """
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2 abstract factories
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3 """
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4
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5 import loader
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6
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7 class CircularReferenceError(Exception):
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8 """factory has detected a circular reference"""
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10 class PyFactory(object):
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11
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12 delimeters = ('%(', ')s')
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14 def __init__(self, config=None, main=''):
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15 self.main = main # main section
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16 self.configure(config or {})
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17
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18 def configure(self, config):
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19 """load a new configuration"""
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20 # TODO: this should really be a configuration update. If you keep
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21 # track of all "apps" and their parents (i.e. as a ADG)
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22 # you should be able to update only relevent apps
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23 self.config = config
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24 self.seen = set() # already seen apps to note cyclic dependencies
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25 self.parsed = {} # instantiated apps
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26
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27 def load(self, name=None):
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28 """load an object"""
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29
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30 name = name or self.main # load main section by default
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31 assert name in self.config, "'%s' not found in configuration"
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32 if name in self.parsed:
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33 return self.parsed[name]
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34 if name in self.seen:
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35 raise CircularReferenceError('Circular reference! : %s' % name)
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36 self.seen.add(name)
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37
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38 # get section
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39 section = self.config[name]
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40 assert 'path' in section
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41
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42 # load object
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43 obj = loader.load(section['path'])
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44
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45 # get the object's arguments (if any)
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46 args = section.get('args', None)
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47 kwargs = section.get('kwargs', None)
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48
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49 # if args and kwargs aren't there, you're done!
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50 if args is None and kwargs is None:
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51 self.parsed[name] = obj
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52 return obj
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53
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54 # interpolate arguments
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55 if args:
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56 args = [self.interpolate(arg) for arg in args]
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57 else:
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58 args = []
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59 if kwargs:
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60 kwargs = dict([(key, self.interpolate(value))
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61 for key, value in kwargs.items()])
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62 else:
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63 kwargs = {}
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65 # invoke
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66 self.parsed[name] = obj(*args, **kwargs)
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67 return self.parsed[name]
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69 def interpolate(self, value):
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71 # only interpolate strings
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72 if not isinstance(value, basestring):
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73 return value
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75 if value.startswith(self.delimeters[0]) and value.endswith(self.delimeters[1]):
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76 value = value[len(self.delimeters[0]):-len(self.delimeters[1])]
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77 if value in self.config:
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78 return self.load(value)
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79 return value
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