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annotate pyloader/factory.py @ 9:ff634cc2e62b

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unfinished sketch of an abstract factory
author Jeff Hammel <jhammel@mozilla.com>
date Thu, 26 May 2011 18:14:56 -0700
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children ba2355d57998
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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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9
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10 class PyFactory(object):
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11
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12 delimeters = ('%(', ')s')
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13
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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.seen = set() # already seen apps to note cyclic dependencies
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17 self.parsed = {} # instantiated apps
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18 self.load(config or {})
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19
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20 def load(self, config, name=None):
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21 name = name or self.main # load main section by default
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22 assert name in config, "'%s' not found in config"
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23 if name in self.parsed:
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24 return self.parsed[name]
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25 if name in self.seen:
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26 raise CircularReferenceError('Circular reference! : %s' % name)
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27 self.seen.add(name)
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28
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29 # get section
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30 section = config['name']
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31 assert 'path' in section
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32
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33 # load object
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34 obj = loader.load(section['path'])
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35
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36 # interpolate arguments
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37 args = section.get('args', None)
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38 kwargs = section.get('kwargs', None)
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39 if args:
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40 args = [self.iterpolate(arg) for arg in args]
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41 if kwargs:
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42 kwargs = dict([(key, self.interpolate(value))
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43 for key, value in kwargs.items()])
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44
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45 # if args and kwargs aren't there, you're done!
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46
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47 def interpolate(self, value):
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48
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49 # only interpolate strings
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50 if not isinstance(value, basestring):
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51 return value