doorstop.gui.store

Complexity

Total Complexity

7

Size/Duplication

Total Lines	41
Duplicated Lines	0 %

Importance

Changes

0

5 Methods

Rating	Name	Duplication	Size	Complexity
A	Store.remove_observer()	0	2	1
A	Store.dispatch()	0	7	3
A	Store.state()	0	3	1
A	Store.__init__()	0	4	1
A	Store.add_observer()	0	3	1

#!/usr/bin/env python

from typing import Optional
from typing import Callable
from typing import List  # noqa  # pylint: disable=unused-import

from doorstop import common

from doorstop.gui.action import Action
from doorstop.gui.state import State
from doorstop.gui.reducer import Reducer

log = common.logger(__name__)


class Store():

    @property
    def state(self) -> Optional[State]:
        return self.__state

    def __init__(self, reducer: Reducer, initial_state: Optional[State] = None) -> None:
        self.__observer = []  # type: List[Callable[["Store"], None]]
        self.__state = initial_state
        self.__reducer = reducer

    def add_observer(self, observer: Callable[["Store"], None]) -> None:
        self.__observer.append(observer)
        observer(self)

    def remove_observer(self, observer: Callable[["Store"], None]) -> None:
        self.__observer.remove(observer)

    def dispatch(self, action: Action) -> None:
        new_state = self.__reducer.reduce(self.state, action)
        if new_state != self.__state:
            log.info(action.__class__.__name__)
            self.__state = new_state
            for curr_observer in self.__observer:
                curr_observer(self)