enbock / Simple-Storage

import StorageAdapter from './StorageAdapter';

export interface AdapterDictionary {

  [index: string]: StorageAdapter<any>

}

export default class DataStorage {

  protected domain: string;

  protected storage: Storage;

  protected adapters: AdapterDictionary;

  constructor(domain: string, storage: Storage) {

    this.domain = domain;

    this.storage = storage;

    this.adapters = {};

  }

  attach<Type>(key: string, adapter: ObserverAdapter<Type>): StorageAdapter<Type> {

    const callback: OnChangeCallback<Type> = (newValue: Type) => this.updateStorage(key, newValue);

    const storageAdapter: StorageAdapter<Type> = new StorageAdapter<Type>(adapter, callback);

    this.adapters[key] = storageAdapter;

    return storageAdapter;

  }

  loadData<Type>(key: string, initialValue: Type): Type {

    const serializedJsonData: string | null = this.storage.getItem(this.domain + '::' + key);

    let data: Type = initialValue;

    if (serializedJsonData != null) {

      data = JSON.parse(serializedJsonData) as Type;

    }

    return data;

  }

}