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firestar5683
65 lines
1.9 KiB
Python
65 lines
1.9 KiB
Python
from typing import Callable, Dict, Optional, TypeVar, cast
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from reactivex import Observable, abc
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from reactivex.typing import Mapper
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_T = TypeVar("_T")
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_TKey = TypeVar("_TKey")
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_TValue = TypeVar("_TValue")
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def to_dict_(
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key_mapper: Mapper[_T, _TKey], element_mapper: Optional[Mapper[_T, _TValue]] = None
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) -> Callable[[Observable[_T]], Observable[Dict[_TKey, _TValue]]]:
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def to_dict(source: Observable[_T]) -> Observable[Dict[_TKey, _TValue]]:
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"""Converts the observable sequence to a Map if it exists.
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Args:
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source: Source observable to convert.
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Returns:
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An observable sequence with a single value of a dictionary
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containing the values from the observable sequence.
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"""
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def subscribe(
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observer: abc.ObserverBase[Dict[_TKey, _TValue]],
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scheduler: Optional[abc.SchedulerBase] = None,
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) -> abc.DisposableBase:
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m: Dict[_TKey, _TValue] = dict()
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def on_next(x: _T) -> None:
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try:
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key = key_mapper(x)
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except Exception as ex: # pylint: disable=broad-except
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observer.on_error(ex)
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return
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if element_mapper:
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try:
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element = element_mapper(x)
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except Exception as ex: # pylint: disable=broad-except
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observer.on_error(ex)
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return
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else:
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element = cast(_TValue, x)
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m[key] = cast(_TValue, element)
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def on_completed() -> None:
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nonlocal m
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observer.on_next(m)
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m = dict()
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observer.on_completed()
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return source.subscribe(
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on_next, observer.on_error, on_completed, scheduler=scheduler
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)
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return Observable(subscribe)
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return to_dict
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__all__ = ["to_dict_"]
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