forked from MapComplete/MapComplete
128 lines
No EOL
5.2 KiB
TypeScript
128 lines
No EOL
5.2 KiB
TypeScript
import {Changes} from "../../Osm/Changes";
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import {OsmNode, OsmObject, OsmRelation, OsmWay} from "../../Osm/OsmObject";
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import FeatureSource from "../FeatureSource";
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import {UIEventSource} from "../../UIEventSource";
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import {ChangeDescription} from "../../Osm/Actions/ChangeDescription";
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import {ElementStorage} from "../../ElementStorage";
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export class NewGeometryFromChangesFeatureSource implements FeatureSource {
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// This class name truly puts the 'Java' into 'Javascript'
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/**
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* A feature source containing exclusively new elements
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*/
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public readonly features: UIEventSource<{ feature: any; freshness: Date }[]> = new UIEventSource<{ feature: any; freshness: Date }[]>([]);
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public readonly name: string = "newFeatures";
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constructor(changes: Changes, allElementStorage: ElementStorage, backendUrl: string) {
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const seenChanges = new Set<ChangeDescription>();
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const features = this.features.data;
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const self = this;
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changes.pendingChanges.addCallbackAndRunD(changes => {
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if (changes.length === 0) {
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return;
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}
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const now = new Date();
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let somethingChanged = false;
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function add(feature) {
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feature.id = feature.properties.id
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features.push({
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feature: feature,
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freshness: now
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})
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somethingChanged = true;
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}
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for (const change of changes) {
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if (seenChanges.has(change)) {
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// Already handled
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continue;
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}
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seenChanges.add(change)
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if (change.tags === undefined) {
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// If tags is undefined, this is probably a new point that is part of a split road
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continue
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}
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if (change.id > 0) {
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// This is an already existing object
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// In _most_ of the cases, this means that this _isn't_ a new object
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// However, when a point is snapped to an already existing point, we have to create a representation for this point!
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// For this, we introspect the change
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if (allElementStorage.has(change.id)) {
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// const currentTags = allElementStorage.getEventSourceById(change.id).data
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continue;
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}
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console.debug("Detected a reused point")
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// The 'allElementsStore' does _not_ have this point yet, so we have to create it
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OsmObject.DownloadObjectAsync(change.type + "/" + change.id).then(feat => {
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console.log("Got the reused point:", feat)
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for (const kv of change.tags) {
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feat.tags[kv.k] = kv.v
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}
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const geojson = feat.asGeoJson();
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allElementStorage.addOrGetElement(geojson)
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self.features.data.push({feature: geojson, freshness: new Date()})
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self.features.ping()
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})
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continue
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} else if (change.id < 0 && change.changes === undefined) {
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// The geometry is not described - not a new point
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if (change.id < 0) {
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console.error("WARNING: got a new point without geometry!")
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}
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continue;
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}
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try {
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const tags = {}
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for (const kv of change.tags) {
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tags[kv.k] = kv.v
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}
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tags["id"] = change.type + "/" + change.id
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tags["_backend"] = backendUrl
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switch (change.type) {
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case "node":
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const n = new OsmNode(change.id)
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n.tags = tags
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n.lat = change.changes["lat"]
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n.lon = change.changes["lon"]
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const geojson = n.asGeoJson()
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add(geojson)
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break;
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case "way":
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const w = new OsmWay(change.id)
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w.tags = tags
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w.nodes = change.changes["nodes"]
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w.coordinates = change.changes["coordinates"].map(([lon, lat]) => [lat, lon])
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add(w.asGeoJson())
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break;
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case "relation":
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const r = new OsmRelation(change.id)
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r.tags = tags
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r.members = change.changes["members"]
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add(r.asGeoJson())
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break;
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}
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} catch (e) {
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console.error("Could not generate a new geometry to render on screen for:", e)
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}
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}
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if (somethingChanged) {
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self.features.ping()
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}
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})
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}
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} |