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Provider.overridden lazy initialization

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This commit is contained in:
Roman Mogilatov 2015-03-20 15:16:11 +02:00
parent 27bf9e0a8e
commit eaf5179c76
1 changed files with 7 additions and 4 deletions
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11
objects/providers.py
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@ -20,7 +20,7 @@ class Provider(object):
def __init__(self): def __init__(self):
"""Initializer.""" """Initializer."""
self.overridden = list() self.overridden = None
def __call__(self, *args, **kwargs): def __call__(self, *args, **kwargs):
"""Return provided instance.""" """Return provided instance."""
@ -32,18 +32,21 @@ class Provider(object):
def override(self, provider): def override(self, provider):
"""Override provider with another provider.""" """Override provider with another provider."""
self.overridden.append(ensure_is_provider(provider)) if not self.overridden:
self.overridden = (ensure_is_provider(provider),)
else:
self.overridden = self.overridden + (ensure_is_provider(provider),)
def reset_override(self): def reset_override(self):
"""Reset all overriding providers.""" """Reset all overriding providers."""
self.overridden = list() self.overridden = None
@property @property
def last_overriding(self): def last_overriding(self):
"""Return last overriding provider.""" """Return last overriding provider."""
try: try:
return self.overridden[-1] return self.overridden[-1]
except IndexError: except (TypeError, IndexError):
raise Error('Provider {0} '.format(str(self)) + raise Error('Provider {0} '.format(str(self)) +
'is not overridden') 'is not overridden')