from .exception import MissingRequiredError, ReadOnlyError
__all__ = ("Configuration",)
class Configuration:
def __init__(self, settings, parent=None):
self.__dict__["_parent"] = parent
self.__dict__["_settings"] = {}
for setting in settings:
self._settings[setting.name] = setting
def validate_setting(self, name):
if name in self._settings:
setting = self._settings[name]
if setting.required and not setting.established:
if self._parent:
self._parent.validate_setting(name)
else:
raise MissingRequiredError(name)
elif self._parent:
self._parent.validate_setting(name)
else:
raise AttributeError('No such setting "%s"' % name)
def validate(self):
for name in self:
self.validate_setting(name)
def __getattr__(self, name):
if name in self._settings:
if self._settings[name].established:
return self._settings[name].value
elif self._parent:
return getattr(self._parent, name)
else:
return self._settings[name].default
elif self._parent:
return getattr(self._parent, name)
else:
raise AttributeError('No such setting "%s"' % name)
def __getitem__(self, key):
return getattr(self, key)
def __setattr__(self, name, value):
raise ReadOnlyError("Cannot change the value of settings")
def __setitem__(self, key, value):
setattr(self, key, value)
def __delattr__(self, name):
raise ReadOnlyError("Cannot delete settings")
def __delitem__(self, key):
delattr(self, key)
def __iter__(self):
all_names = set(self._settings.keys())
if self._parent:
all_names.update(iter(self._parent))
return iter(all_names)
def __len__(self):
return len(list(iter(self)))
def __contains__(self, item):
return item in list(iter(self))
def __str__(self): # pragma: no cover
return "Configuration(%s)" % (
", ".join([u"%s=%s" % (name, repr(self[name])) for name in self])
)
def __repr__(self): # pragma: no cover
return "<%s>" % str(self)
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