import LayerConfig from "../Customizations/JSON/LayerConfig"; import SimpleMetaTagger from "./SimpleMetaTagger"; import {ExtraFunction} from "./ExtraFunction"; /** * Metatagging adds various tags to the elements, e.g. lat, lon, surface area, ... * * All metatags start with an underscore */ export default class MetaTagging { /** * An actor which adds metatags on every feature in the given object * The features are a list of geojson-features, with a "properties"-field and geometry */ static addMetatags(features: { feature: any; freshness: Date }[], layers: LayerConfig[]) { for (const metatag of SimpleMetaTagger.metatags) { try { metatag.addMetaTags(features); } catch (e) { console.error("Could not calculate metatag for ", metatag.keys.join(","), ":", e) } } // The functions - per layer - which add the new keys const layerFuncs = new Map, feature: any) => void)>(); for (const layer of layers) { layerFuncs.set(layer.id, this.createRetaggingFunc(layer)); } const featuresPerLayer = new Map(); for (const feature of features) { const key = feature.feature._matching_layer_id; if (!featuresPerLayer.has(key)) { featuresPerLayer.set(key, []) } featuresPerLayer.get(key).push(feature.feature) } for (const feature of features) { // @ts-ignore const key = feature.feature._matching_layer_id; const f = layerFuncs.get(key); if (f === undefined) { continue; } f(featuresPerLayer, feature.feature) } } private static createRetaggingFunc(layer: LayerConfig): ((featuresPerLayer: Map, feature: any) => void) { const calculatedTags: [string, string][] = layer.calculatedTags; if (calculatedTags === undefined) { return undefined; } const functions: ((featuresPerLayer: Map, feature: any) => void)[] = []; for (const entry of calculatedTags) { const key = entry[0] const code = entry[1]; if (code === undefined) { continue; } const func = new Function("feat", "return " + code + ";"); const f = (featuresPerLayer, feature: any) => { feature.properties[key] = func(feature); } functions.push(f) } return (featuresPerLayer: Map, feature) => { const tags = feature.properties if (tags === undefined) { return; } ExtraFunction.FullPatchFeature(featuresPerLayer, feature); try { for (const f of functions) { f(featuresPerLayer, feature); } } catch (e) { console.error("While calculating a tag value: ", e) } } } }