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53 lines
1.4 KiB
53 lines
1.4 KiB
import ObservableStore from 'obs-store'
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/**
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* An ObservableStore that can composes a flat
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* structure of child stores based on configuration
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*/
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export default class ComposableObservableStore extends ObservableStore {
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/**
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* Create a new store
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*
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* @param {Object} [initState] - The initial store state
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* @param {Object} [config] - Map of internal state keys to child stores
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*/
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constructor (initState, config) {
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super(initState)
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this.updateStructure(config)
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}
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/**
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* Composes a new internal store subscription structure
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*
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* @param {Object} [config] - Map of internal state keys to child stores
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*/
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updateStructure (config) {
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this.config = config
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this.removeAllListeners()
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for (const key in config) {
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if (config.hasOwnProperty(key)) {
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config[key].subscribe((state) => {
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this.updateState({ [key]: state })
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})
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}
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}
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}
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/**
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* Merges all child store state into a single object rather than
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* returning an object keyed by child store class name
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*
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* @returns {Object} - Object containing merged child store state
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*/
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getFlatState () {
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let flatState = {}
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for (const key in this.config) {
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if (this.config.hasOwnProperty(key)) {
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const controller = this.config[key]
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const state = controller.getState ? controller.getState() : controller.state
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flatState = { ...flatState, ...state }
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}
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}
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return flatState
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}
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}
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