All files / core decorators.ts

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46.15% Branches 12/26
36.36% Functions 4/11
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import { STATEX_ACTION_KEY, STATEX_DATA_BINDINGS_KEY } from './constance'
 
import { Action } from './action'
import { DataObserver } from '../@angular'
import { Observable } from 'rxjs/Observable'
import { State } from './state'
import { StateSelector } from './state-selector'
import { Subscription } from 'rxjs/Subscription'
 
declare var Reflect: any
 
/**
 * Bind data for give key and target using a selector function
 *
 * @param {any} target
 * @param {any} key
 * @param {any} selectorFunc
 */
export function bindData(target: any, key: string, selector: StateSelector): Subscription {
  return State.select(selector).subscribe(args => {
    if (typeof target.setState === 'function') {
      let state = {}
      state[key] = args
      target.setState(state)
    }
    if (typeof target[key] === 'function') return target[key].call(target, args)
    target[key] = args
  })
}
 
/**
 * Binds action to a function
 *
 * @example
 * class TodoStore {
 *
 *    @action
 *    addTodo(state: State, action: AddTodoAction): State {
 *       // return modified state
 *    }
 * }
 *
 * @export
 * @param {*} target
 * @param {string} propertyKey
 * @param {PropertyDescriptor} descriptor
 * @returns
 */
export function action(targetAction?: Action) {
 
  return (target: any, propertyKey: string, descriptor: PropertyDescriptor): Promise<any> | Observable<any> | any => {
 
    if (targetAction == undefined) {
      let metadata = Reflect.getMetadata('design:paramtypes', target, propertyKey)
      if (metadata == undefined || metadata.length < 2) throw new Error('@action() must be applied to a function with two arguments. ' +
        'eg: reducer(state: State, action: SubclassOfAction): State { }')
      targetAction = metadata[1]
    }
    let statexActions = {}
    if (Reflect.hasMetadata(STATEX_ACTION_KEY, target)) {
      statexActions = Reflect.getMetadata(STATEX_ACTION_KEY, target)
    }
    statexActions[propertyKey] = targetAction
    Reflect.defineMetadata(STATEX_ACTION_KEY, statexActions, target)
 
    return {
      value: function (state: any, payload: Action): Observable<any> {
        return descriptor.value.call(this, state, payload)
      }
    }
  }
}
 
/**
 * Add @data meta
 *
 * @export
 * @param {*} target
 * @param {any} propertyKey
 * @param {any} selector
 * @param {any} bindImmediate
 */
export function data(selector: StateSelector, bindImmediate?: boolean) {
  return (target: any, propertyKey: string) => {
 
    let metaTarget = target instanceof DataObserver ? target : target.constructor
 
    let bindingsMeta = Reflect.getMetadata(STATEX_DATA_BINDINGS_KEY, metaTarget)
    if (!Reflect.hasMetadata(STATEX_DATA_BINDINGS_KEY, metaTarget)) {
      bindingsMeta = { selectors: {}, subscriptions: [], destroyed: !bindImmediate }
    }
 
    bindingsMeta.selectors[propertyKey] = selector
    if (bindImmediate) {
      bindingsMeta.subscriptions.push(bindData(target, propertyKey, selector))
    }
    Reflect.defineMetadata(STATEX_DATA_BINDINGS_KEY, bindingsMeta, metaTarget)
  }
}
 
/**
 * Subscribe to the state events and map it to properties
 *
 * @export
 */
export function subscribe(propsClass) {
  let dataBindings = Reflect.getMetadata(STATEX_DATA_BINDINGS_KEY, propsClass || this)
  if (dataBindings != undefined && dataBindings.destroyed === true) {
    dataBindings.subscriptions = dataBindings.subscriptions.concat(
      Object.keys(dataBindings.selectors)
        .map(key => bindData(this, key, dataBindings.selectors[key]))
    )
 
    dataBindings.destroyed = false
    Reflect.defineMetadata(STATEX_DATA_BINDINGS_KEY, dataBindings, this)
  }
}
 
/**
 * Unsubscribe from the state changes
 *
 * @export
 */
export function unsubscribe() {
  let dataBindings = Reflect.getMetadata(STATEX_DATA_BINDINGS_KEY, this)
  if (dataBindings != undefined) {
    dataBindings.subscriptions.forEach(subscription => subscription.unsubscribe())
    dataBindings.subscriptions = []
    dataBindings.destroyed = true
    Reflect.defineMetadata(STATEX_DATA_BINDINGS_KEY, dataBindings, this)
  }
}