box-ui-elements-mlh/es/utils/flatten.js

Box UI Elements

/**
 * 
 * @file Function to flatten an item list
 * @author Box
 */
import { getBadItemError } from './error';
import { TYPE_FOLDER, TYPE_FILE, TYPE_WEBLINK } from '../constants';

/**
 * Takes an item list and flattens it by moving
 * all item entries into the cache and replacing the list
 * entries with references to those items in the cache.
 * Web links are trated as files.
 *
 * @param {Array} list to flatten
 * @param {Folder} folderAPI api for files
 * @param {File} fileAPI api for files
 * @param {WebLink} weblinkAPI api for web links
 * @return {Array} list with items replaced with reference keys
 */
export default function (list, folderAPI, fileAPI, weblinkAPI) {
  var items = [];
  list.forEach(function (item) {
    var id = item.id,
        type = item.type;

    if (!id || !type) {
      throw getBadItemError();
    }

    var api;

    switch (type) {
      case TYPE_FOLDER:
        api = folderAPI;
        break;

      case TYPE_FILE:
        api = fileAPI;
        break;

      case TYPE_WEBLINK:
        api = weblinkAPI;
        break;

      default:
        throw new Error('Unknown Type!');
    }

    var cache = api.getCache();
    var key = api.getCacheKey(id);

    if (cache.has(key)) {
      cache.merge(key, item);
    } else {
      cache.set(key, item);
    }

    items.push(key);
  });
  return items;
}
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