Source: media/data/GalleryConfigLoader.js

  1. import { IndexBinder } from "../../map/importer/binder/IndexBinder.js";
  2. import { ServiceDataRequest } from "./utils.js";
  3. import { MediaGalleryQueryParameter } from "../grid/MediaGalleryQueryParameter.js";
  4. export { GalleryConfigLoader }
  6. /**
  7.  * Class representing the loading of the gallery configuration.
  8.  */
  9. class GalleryConfigLoader {
  10.     /**
  11.      * Create the gallery configuration loading object.
  12.      */
  13.     constructor() {
  14.         this.catalogConfigDict;
  15.         this.galleryConfigDict;
  16.         this.queryConfigDict;
  17.     }
  19.     /**
  20.      * Return the service configuration dictionary, regardless of whether it was loaded via catalogue or somewhere else (future).
  21.      */
  22.     get serviceConfigDict() {
  23.         const serviceConfigDict = {}
  24.         if (this.catalogConfigDict)
  25.             serviceConfigDict['catalogConfigDict'] = this.catalogConfigDict
  26.         return serviceConfigDict
  27.     }
  29.     /**
  30.      * Load the entire gallery configuration based on an identifier.
  31.      * This identifier is known to a catalog response.
  32.      * With it, the gallery service configuration can be loaded from the catalog.
  33.      * Furthermore, it contains the URL to the gallery.config.json file, that is finally loaded too.
  34.      * @param {*} sourceID - Identifier for the gallery source data.
  35.      * @returns Promise with the gallery configuration.
  36.      */
  37.     loadConfigData(sourceID) {
  38.         this._loadQueryConfig();
  39.         sourceID = sourceID || this.queryConfigDict['sourceID'];
  40.         return this._loadConfigFromCatalog(sourceID).then((catalogConfig) => {
  41.             const caseFallback = catalogConfig == null;
  42.             if (caseFallback) {
  43.                 return Promise.reject('Info is not in catalog')
  44.             }
  45.             return catalogConfig
  46.         }).catch((e) => {
  47.             const message = 'Catalog does not provide data'
  48.             console.error(`${message}:`, e ? e : 'Error when loading catalog');
  49.             throw new Error(message);
  50.         }).then((config) => {
  51.             const id = Object.keys(config)[0];
  52.             const galleryConfigUrlCatalog = config[id]?.['galleryConfig']?.['url'];
  53.             const galleryConfigUrl = galleryConfigUrlCatalog;
  54.             return this._loadGalleryConfig(galleryConfigUrl)
  55.         }).catch((e) => {
  56.             const message = 'Gallery configuration cannot be loaded'
  57.             console.error(`${message}:`, e ? e : 'Error when loading gallery configuration file');
  58.             throw new Error(message);
  59.         })
  60.     }
  62.     _checkForEmptyResponse(config) {
  63.         if (config.constructor == Object) {
  64.             return Object.keys(config).length === 0
  65.         }
  66.         else if (config.constructor == Array) {
  67.             return config.length === 0
  68.         }
  69.         return null
  70.     }
  72.     _loadConfigFromCatalog(idCatalogLayer) {
  73.         const binder = new IndexBinder();
  74.         return binder.fetchLayers({ query: `(uniqueId:"${idCatalogLayer}")`, hits: 10 }).then((catalogConfig) => {
  75.             this.catalogConfigDict = this._checkForEmptyResponse(catalogConfig) ? null : catalogConfig
  76.             return this.catalogConfigDict
  77.         })
  78.     }
  80.     _loadQueryConfig() {
  81.         const GalleryQueryParameter = new MediaGalleryQueryParameter();
  82.         this.queryConfigDict = GalleryQueryParameter.queryParameterDict;
  83.     }
  85.     _loadGalleryConfig(galleryConfigUrl) {
  86.         return ServiceDataRequest.requestJSON(decodeURIComponent(galleryConfigUrl)).then((data) => {
  87.             this.galleryConfigDict = data;
  88.             return data
  89.         })
  90.     }
  91. }