diff options
Diffstat (limited to 'sdnr/wt/odlux/framework/src/flux/store.ts')
-rw-r--r-- | sdnr/wt/odlux/framework/src/flux/store.ts | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/sdnr/wt/odlux/framework/src/flux/store.ts b/sdnr/wt/odlux/framework/src/flux/store.ts new file mode 100644 index 000000000..7a2e578f9 --- /dev/null +++ b/sdnr/wt/odlux/framework/src/flux/store.ts @@ -0,0 +1,81 @@ +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>; + +} + |