mapcomplete/Logic/FeatureSource/LocalStorageSaver.ts

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/***
* Saves all the features that are passed in to localstorage, so they can be retrieved on the next run
*
* Technically, more an Actor then a featuresource, but it fits more neatly this ay
*/
import FeatureSource from "./FeatureSource";
import {UIEventSource} from "../UIEventSource";
import LayoutConfig from "../../Customizations/JSON/LayoutConfig";
export default class LocalStorageSaver implements FeatureSource {
public static readonly storageKey: string = "cached-features";
public readonly features: UIEventSource<{ feature: any; freshness: Date }[]>;
constructor(source: FeatureSource, layout: UIEventSource<LayoutConfig>) {
this.features = source.features;
this.features.addCallbackAndRun(features => {
if (features === undefined) {
return;
}
if(features.length == 0){
return;
}
try {
const key = LocalStorageSaver.storageKey+layout.data.id
localStorage.setItem(key, JSON.stringify(features));
console.log("Saved ",features.length, "elements to",key)
} catch (e) {
console.warn("Could not save the features to local storage:", e)
}
})
}
}