mirror of
https://github.com/ets-labs/python-dependency-injector.git
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119 lines
3.6 KiB
Python
119 lines
3.6 KiB
Python
"""Dependency injector catalogs bundle module."""
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import six
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from dependency_injector.errors import (
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Error,
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UndefinedProviderError,
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)
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@six.python_2_unicode_compatible
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class CatalogBundle(object):
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"""Bundle of catalog providers.
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:py:class:`CatalogBundle` is a frozen, limited collection of catalog
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providers. While catalog could be used as a centralized place for
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particular providers group, such bundles of catalog providers can be used
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for creating several frozen, limited scopes that could be passed to
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different subsystems.
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:py:class:`CatalogBundle` has API's parity with catalogs
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(:py:class:`DeclarativeCatalog` or :py:class:`DynamicCatalog`) in terms of
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retrieving the providers, but it is "frozen" in terms of modification
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provider's list.
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:py:class:`CatalogBundle` is considered to be dependable on catalogs
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(:py:class:`DeclarativeCatalog` or :py:class:`DynamicCatalog`) entity by
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its design.
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.. py:attribute:: catalog
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Bundle's catalog.
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:type: :py:class:`DeclarativeCatalog` | :py:class:`DynamicCatalog`
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.. py:attribute:: providers
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Dictionary of all providers.
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:type: dict[str, :py:class:`dependency_injector.providers.Provider`]
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"""
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catalog = None
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__IS_CATALOG_BUNDLE__ = True
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__slots__ = ('providers', '__dict__')
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@classmethod
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def sub_cls_factory(cls, catalog):
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"""Create bundle subclass for catalog.
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:return: Subclass of :py:class:`CatalogBundle`.
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:rtype: :py:class:`CatalogBundle`
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"""
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return type('BundleSubclass', (cls,), dict(catalog=catalog))
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def __init__(self, *providers):
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"""Initializer.
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:param providers: Tuple of catalog's bundle providers.
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:type providers: tuple[
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:py:class:`dependency_injector.providers.Provider`]
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"""
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self.providers = dict((self.catalog.get_provider_bind_name(provider),
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provider)
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for provider in providers)
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self.__dict__.update(self.providers)
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super(CatalogBundle, self).__init__()
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def get_provider(self, name):
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"""Return provider with specified name or raise an error.
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:param name: Provider's name.
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:type name: str
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:raise: :py:exc:`dependency_injector.errors.UndefinedProviderError`
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:return: Provider with specified name.
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:rtype: :py:class:`dependency_injector.providers.Provider`
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"""
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try:
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return self.providers[name]
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except KeyError:
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raise Error('Provider "{0}" is not a part of {1}'.format(name,
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self))
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def has_provider(self, name):
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"""Check if there is provider with certain name.
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:param name: Provider's name.
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:type name: str
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:rtype: bool
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"""
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return name in self.providers
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def __getattr__(self, item):
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"""Return provider with specified name or raise en error.
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:param name: Attribute's name.
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:type name: str
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:raise: :py:exc:`dependency_injector.errors.UndefinedProviderError`
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"""
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if item.startswith('__') and item.endswith('__'):
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return super(CatalogBundle, self).__getattr__(item)
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raise UndefinedProviderError('Provider "{0}" is not a part '
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'of {1}'.format(item, self))
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def __repr__(self):
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"""Return string representation of catalog's bundle.
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:rtype: str
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"""
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return '<{0}.Bundle({1})>'.format(
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self.catalog.name, ', '.join(six.iterkeys(self.providers)))
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__str__ = __repr__
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