forked from MapComplete/MapComplete
95 lines
3.5 KiB
TypeScript
95 lines
3.5 KiB
TypeScript
import {FeatureSourceForLayer} from "./FeatureSource";
|
|
import {UIEventSource} from "../UIEventSource";
|
|
import {Utils} from "../../Utils";
|
|
import FilteredLayer from "../../Models/FilteredLayer";
|
|
import {control} from "leaflet";
|
|
|
|
|
|
/**
|
|
* Fetches a geojson file somewhere and passes it along
|
|
*/
|
|
export default class GeoJsonSource implements FeatureSourceForLayer {
|
|
|
|
public readonly features: UIEventSource<{ feature: any; freshness: Date }[]>;
|
|
public readonly name;
|
|
public readonly isOsmCache: boolean
|
|
private onFail: ((errorMsg: any, url: string) => void) = undefined;
|
|
private readonly seenids: Set<string> = new Set<string>()
|
|
public readonly layer: FilteredLayer;
|
|
|
|
|
|
public constructor(flayer: FilteredLayer,
|
|
zxy?: [number, number, number]) {
|
|
|
|
if (flayer.layerDef.source.geojsonZoomLevel !== undefined && zxy === undefined) {
|
|
throw "Dynamic layers are not supported. Use 'DynamicGeoJsonTileSource instead"
|
|
}
|
|
|
|
this.layer = flayer;
|
|
let url = flayer.layerDef.source.geojsonSource.replace("{layer}", flayer.layerDef.id);
|
|
if (zxy !== undefined) {
|
|
url = url
|
|
.replace('{z}', "" + zxy[0])
|
|
.replace('{x}', "" + zxy[1])
|
|
.replace('{y}', "" + zxy[2])
|
|
}
|
|
|
|
this.name = "GeoJsonSource of " + url;
|
|
|
|
this.isOsmCache = flayer.layerDef.source.isOsmCacheLayer;
|
|
this.features = new UIEventSource<{ feature: any; freshness: Date }[]>([])
|
|
this.LoadJSONFrom(url)
|
|
}
|
|
|
|
|
|
private LoadJSONFrom(url: string) {
|
|
const eventSource = this.features;
|
|
const self = this;
|
|
Utils.downloadJson(url)
|
|
.then(json => {
|
|
if (json.elements === [] && json.remarks.indexOf("runtime error") > 0) {
|
|
self.onFail("Runtime error (timeout)", url)
|
|
return;
|
|
}
|
|
const time = new Date();
|
|
const newFeatures: { feature: any, freshness: Date } [] = []
|
|
let i = 0;
|
|
let skipped = 0;
|
|
for (const feature of json.features) {
|
|
const props = feature.properties
|
|
for (const key in props) {
|
|
if (typeof props[key] !== "string") {
|
|
props[key] = "" + props[key]
|
|
}
|
|
}
|
|
|
|
if (props.id === undefined) {
|
|
props.id = url + "/" + i;
|
|
feature.id = url + "/" + i;
|
|
i++;
|
|
}
|
|
if (self.seenids.has(props.id)) {
|
|
skipped++;
|
|
continue;
|
|
}
|
|
self.seenids.add(props.id)
|
|
|
|
let freshness: Date = time;
|
|
if (feature.properties["_last_edit:timestamp"] !== undefined) {
|
|
freshness = new Date(props["_last_edit:timestamp"])
|
|
}
|
|
|
|
newFeatures.push({feature: feature, freshness: freshness})
|
|
}
|
|
console.debug("Downloaded " + newFeatures.length + " new features and " + skipped + " already seen features from " + url);
|
|
|
|
if (newFeatures.length == 0) {
|
|
return;
|
|
}
|
|
|
|
eventSource.setData(eventSource.data.concat(newFeatures))
|
|
|
|
}).catch(msg => console.error("Could not load geojon layer", url, "due to", msg))
|
|
}
|
|
|
|
}
|