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