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101 lines
3.0 KiB
Python
101 lines
3.0 KiB
Python
from __future__ import annotations
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from abc import (
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abstractmethod,
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abstractproperty,
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)
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from typing import (
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Iterable,
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Optional,
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Set,
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)
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class UriHolder:
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### abstracted
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@abstractproperty
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def _primary_uri(self) -> str:
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"""Returns the primary uri of this object in a naive way."""
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@abstractmethod
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def _set_primary_uri(self, uri: str) -> None:
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"""Sets the primary uri of this object in a naive way."""
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@abstractproperty
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def _uri_set(self) -> Set[str]:
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"""Returns the uri set of this object in a naive way."""
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@abstractmethod
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def _clear_uri_set(self) -> None:
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"""Sets the uri set of this object in a naive way."""
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@abstractmethod
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def _add_uri_to_set(self, uri: str) -> bool:
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"""Adds a uri to the uri set of this object in a naive way.
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Returns True if the uri was not in the uri set before.
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"""
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@abstractmethod
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def _remove_uri_from_set(self, uri: str) -> bool:
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"""Removes a uri to the uri set of this object in a naive way.
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Returns True if the uri was in the uri set before.
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"""
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### implemented
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@property
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def primary_uri(self) -> str:
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"""Returns the current primary uri of this object."""
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return self._primary_uri
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@primary_uri.setter
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def primary_uri(self, uri: str) -> None:
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self.set_primary_uri(uri)
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@property
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def uri_set(self) -> Set[str]:
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return self._uri_set
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@uri_set.setter
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def uri_set(self, uri_list: Iterable[Optional[str]]) -> None:
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self._clear_uri_set()
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self.add_uris(uri_list)
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# uri_set has no setter due to the problem which uri then becomes primary
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# instead, set_as_only_uri & add_uris should be used so the primary becomes obvious
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def is_primary_uri(self, compare_uri: str) -> bool:
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"""Returns True if the given uri is equal to the current primary uri."""
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return self.primary_uri == compare_uri
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def set_primary_uri(self, uri: str) -> bool:
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"""Sets the current primary of this object.
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It will also add the uri to the uri set.
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Returns True if the uri was not in the uri set before.
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You may also just write the primary_uri property if you do not need the return value.
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"""
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ret = self._add_uri_to_set(uri) # might fail, so try first
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self._set_primary_uri(uri)
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return ret
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def set_as_only_uri(self, uri: str) -> None:
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self._clear_uri_set()
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self.set_primary_uri(uri)
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def add_single_uri(self, uri: str) -> bool:
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return self._add_uri_to_set(uri)
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def add_uris(self, uri_list: Iterable[Optional[str]]) -> bool:
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return any([self.add_single_uri(uri) for uri in set(uri_list) if uri])
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def remove_single_uri(self, uri: str) -> bool:
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return self._remove_uri_from_set(uri)
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def remove_uris(self, uri_list: Iterable[Optional[str]]) -> bool:
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return any([self.remove_single_uri(uri) for uri in set(uri_list) if uri])
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