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import { Event } from "../common/event"
import { Action } from './action';
import { IActionHandler } from './action';
export interface Dispatch {
<TAction extends Action>(action: TAction): TAction;
}
export interface Enhancer<TStoreState> {
(store: Store<TStoreState>): Dispatch;
}
class InitialisationAction extends Action { };
const initialisationAction = new InitialisationAction();
export class Store<TStoreState> {
constructor(actionHandler: IActionHandler<TStoreState>, enhancer?: Enhancer<TStoreState>)
constructor(actionHandler: IActionHandler<TStoreState>, initialState: TStoreState, enhancer?: Enhancer<TStoreState>)
constructor(actionHandler: IActionHandler<TStoreState>, initialState?: TStoreState | Enhancer<TStoreState>, enhancer?: Enhancer<TStoreState>) {
if (typeof initialState === 'function') {
enhancer = initialState as Enhancer<TStoreState>;
initialState = undefined;
}
this._isDispatching = false;
this.changed = new Event<void>(); // sollten wir hier eventuell sogar den state mit übergeben ?
this._actionHandler = actionHandler;
this._state = initialState as TStoreState;
if (enhancer) this._dispatch = enhancer(this);
this._dispatch(initialisationAction);
}
public changed: Event<void>;
private _dispatch: Dispatch = <TAction extends Action>(payload: TAction): TAction => {
if (payload == null || !(payload instanceof Action)) {
throw new Error(
'Actions must inherit from type Action. ' +
'Use a custom middleware for async actions.'
);
}
if (this._isDispatching) {
throw new Error('ActionHandler may not dispatch actions.');
}
const oldState = this._state;
try {
this._isDispatching = true;
this._state = this._actionHandler(oldState, payload);
} finally {
this._isDispatching = false;
}
if (this._state !== oldState) {
this.changed.invoke();
}
return payload;
}
public get dispatch(): Dispatch {
return this._dispatch;
}
public get state() {
return this._state
}
private _state: TStoreState;
private _isDispatching: boolean;
private _actionHandler: IActionHandler<TStoreState>;
}
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