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"""Base classes for mapping.""" |
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import abc |
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import functools |
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6
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from .. import common |
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from ..mapper import get_mapper |
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log = common.logger(__name__) |
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def fetch_before(method): |
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"""Decorator for methods that should fetch before call.""" |
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@functools.wraps(method) |
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def wrapped(self, *args, **kwargs): |
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"""Decorated method.""" |
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if not _private_name(args): |
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mapper = get_mapper(self) |
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if mapper and mapper.modified: |
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log.debug("Fetching before call: %s", method.__name__) |
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mapper.fetch() |
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if mapper.auto_store: |
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mapper.store() |
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mapper.modified = False |
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return method(self, *args, **kwargs) |
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return wrapped |
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def store_after(method): |
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"""Decorator for methods that should store after call.""" |
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@functools.wraps(method) |
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def wrapped(self, *args, **kwargs): |
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"""Decorated method.""" |
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result = method(self, *args, **kwargs) |
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if not _private_name(args): |
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mapper = get_mapper(self) |
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if mapper and mapper.auto: |
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log.debug("Storing after call: %s", method.__name__) |
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mapper.store() |
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return result |
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return wrapped |
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def _private_name(args, prefix='_'): |
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"""Determine if a call's first argument is a private variable name.""" |
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try: |
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return args[0].startswith(prefix) |
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except (IndexError, AttributeError): |
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return False |
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class Mappable(metaclass=abc.ABCMeta): |
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"""Base class for objects with attributes mapped to file.""" |
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# pylint: disable=no-member |
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@fetch_before |
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def __getattribute__(self, name): |
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"""Trigger object update when reading attributes.""" |
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return object.__getattribute__(self, name) |
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@store_after |
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def __setattr__(self, name, value): |
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"""Trigger file update when setting attributes.""" |
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super().__setattr__(name, value) |
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@fetch_before |
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def __iter__(self): |
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"""Trigger object update when iterating.""" |
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return super().__iter__() |
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@fetch_before |
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def __getitem__(self, key): |
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"""Trigger object update when reading an index.""" |
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return super().__getitem__(key) |
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@store_after |
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def __setitem__(self, key, value): |
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"""Trigger file update when setting an index.""" |
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super().__setitem__(key, value) |
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@store_after |
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def __delitem__(self, key): |
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"""Trigger file update when deleting an index.""" |
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super().__delitem__(key) |
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@store_after |
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def append(self, value): |
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"""Trigger file update when appending items.""" |
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super().append(value) |
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jacebrowning /
yorm
If a method does not access any attributes of the class, it could also be implemented as a function or static method. This can help improve readability. For example
could be written as