468 lines
No EOL
14 KiB
TypeScript
468 lines
No EOL
14 KiB
TypeScript
import {Utils} from "../../Utils";
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import * as polygon_features from "../../assets/polygon-features.json";
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import {UIEventSource} from "../UIEventSource";
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import {BBox} from "../BBox";
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export abstract class OsmObject {
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private static defaultBackend = "https://www.openstreetmap.org/"
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protected static backendURL = OsmObject.defaultBackend;
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private static polygonFeatures = OsmObject.constructPolygonFeatures()
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private static objectCache = new Map<string, UIEventSource<OsmObject>>();
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private static historyCache = new Map<string, UIEventSource<OsmObject[]>>();
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type: "node" | "way" | "relation";
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id: number;
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/**
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* The OSM tags as simple object
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*/
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tags: {} = {};
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version: number;
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public changed: boolean = false;
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timestamp: Date;
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protected constructor(type: string, id: number) {
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this.id = id;
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// @ts-ignore
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this.type = type;
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this.tags = {
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id: `${this.type}/${id}`
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}
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}
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public static SetBackendUrl(url: string) {
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if (!url.endsWith("/")) {
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throw "Backend URL must end with a '/'"
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}
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if (!url.startsWith("http")) {
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throw "Backend URL must begin with http"
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}
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this.backendURL = url;
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}
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public static DownloadObject(id: string, forceRefresh: boolean = false): UIEventSource<OsmObject> {
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let src: UIEventSource<OsmObject>;
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if (OsmObject.objectCache.has(id)) {
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src = OsmObject.objectCache.get(id)
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if (forceRefresh) {
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src.setData(undefined)
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} else {
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return src;
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}
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} else {
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src = UIEventSource.FromPromise(OsmObject.DownloadObjectAsync(id))
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}
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OsmObject.objectCache.set(id, src);
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return src;
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}
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static async DownloadPropertiesOf(id: string): Promise<any> {
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const splitted = id.split("/");
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const idN = Number(splitted[1]);
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if (idN < 0) {
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return undefined;
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}
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const url = `${OsmObject.backendURL}api/0.6/${id}`;
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const rawData = await Utils.downloadJsonCached(url, 1000)
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return rawData.elements[0].tags
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}
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static async DownloadObjectAsync(id: string): Promise<OsmObject> {
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const splitted = id.split("/");
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const type = splitted[0];
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const idN = Number(splitted[1]);
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if (idN < 0) {
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return undefined;
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}
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const full = (id.startsWith("way")) ? "/full" : "";
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const url = `${OsmObject.backendURL}api/0.6/${id}${full}`;
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const rawData = await Utils.downloadJsonCached(url, 1000)
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// A full query might contain more then just the requested object (e.g. nodes that are part of a way, where we only want the way)
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const parsed = OsmObject.ParseObjects(rawData.elements);
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// Lets fetch the object we need
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for (const osmObject of parsed) {
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if (osmObject.type !== type) {
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continue;
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}
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if (osmObject.id !== idN) {
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continue
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}
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// Found the one!
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return osmObject
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}
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throw "PANIC: requested object is not part of the response"
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}
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/**
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* Downloads the ways that are using this node.
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* Beware: their geometry will be incomplete!
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*/
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public static DownloadReferencingWays(id: string): Promise<OsmWay[]> {
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return Utils.downloadJsonCached(`${OsmObject.backendURL}api/0.6/${id}/ways`, 60 * 1000).then(
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data => {
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return data.elements.map(wayInfo => {
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const way = new OsmWay(wayInfo.id)
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way.LoadData(wayInfo)
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return way
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})
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}
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)
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}
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/**
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* Downloads the relations that are using this feature.
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* Beware: their geometry will be incomplete!
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*/
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public static async DownloadReferencingRelations(id: string): Promise<OsmRelation[]> {
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const data = await Utils.downloadJsonCached(`${OsmObject.backendURL}api/0.6/${id}/relations`, 60 * 1000)
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return data.elements.map(wayInfo => {
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const rel = new OsmRelation(wayInfo.id)
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rel.LoadData(wayInfo)
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rel.SaveExtraData(wayInfo)
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return rel
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})
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}
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public static DownloadHistory(id: string): UIEventSource<OsmObject []> {
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if (OsmObject.historyCache.has(id)) {
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return OsmObject.historyCache.get(id)
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}
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const splitted = id.split("/");
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const type = splitted[0];
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const idN = Number(splitted[1]);
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const src = new UIEventSource<OsmObject[]>([]);
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OsmObject.historyCache.set(id, src);
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Utils.downloadJsonCached(`${OsmObject.backendURL}api/0.6/${type}/${idN}/history`, 10 * 60 * 1000).then(data => {
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const elements: any[] = data.elements;
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const osmObjects: OsmObject[] = []
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for (const element of elements) {
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let osmObject: OsmObject = null
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switch (type) {
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case("node"):
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osmObject = new OsmNode(idN);
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break;
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case("way"):
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osmObject = new OsmWay(idN);
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break;
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case("relation"):
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osmObject = new OsmRelation(idN);
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break;
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}
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osmObject?.LoadData(element);
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osmObject?.SaveExtraData(element, []);
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osmObjects.push(osmObject)
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}
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src.setData(osmObjects)
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})
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return src;
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}
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// bounds should be: [[maxlat, minlon], [minlat, maxlon]] (same as Utils.tile_bounds)
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public static async LoadArea(bbox: BBox): Promise<OsmObject[]> {
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const url = `${OsmObject.backendURL}api/0.6/map.json?bbox=${bbox.minLon},${bbox.minLat},${bbox.maxLon},${bbox.maxLat}`
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const data = await Utils.downloadJson(url)
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const elements: any[] = data.elements;
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return OsmObject.ParseObjects(elements);
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}
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public static ParseObjects(elements: any[]): OsmObject[] {
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const objects: OsmObject[] = [];
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const allNodes: Map<number, OsmNode> = new Map<number, OsmNode>()
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for (const element of elements) {
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const type = element.type;
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const idN = element.id;
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let osmObject: OsmObject = null
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switch (type) {
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case("node"):
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const node = new OsmNode(idN);
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allNodes.set(idN, node);
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osmObject = node
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node.SaveExtraData(element);
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break;
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case("way"):
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osmObject = new OsmWay(idN);
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const nodes = element.nodes.map(i => allNodes.get(i));
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osmObject.SaveExtraData(element, nodes)
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break;
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case("relation"):
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osmObject = new OsmRelation(idN);
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osmObject.SaveExtraData(element, [])
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break;
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}
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if (osmObject !== undefined && OsmObject.backendURL !== OsmObject.defaultBackend) {
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osmObject.tags["_backend"] = OsmObject.backendURL
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}
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osmObject?.LoadData(element)
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objects.push(osmObject)
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}
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return objects;
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}
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protected static isPolygon(tags: any): boolean {
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for (const tagsKey in tags) {
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if (!tags.hasOwnProperty(tagsKey)) {
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continue
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}
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const polyGuide = OsmObject.polygonFeatures.get(tagsKey)
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if (polyGuide === undefined) {
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continue
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}
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if ((polyGuide.values === null)) {
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// We match all
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return !polyGuide.blacklist
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}
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// is the key contained?
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return polyGuide.values.has(tags[tagsKey])
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}
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}
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private static constructPolygonFeatures(): Map<string, { values: Set<string>, blacklist: boolean }> {
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const result = new Map<string, { values: Set<string>, blacklist: boolean }>();
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for (const polygonFeature of polygon_features) {
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const key = polygonFeature.key;
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if (polygonFeature.polygon === "all") {
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result.set(key, {values: null, blacklist: false})
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continue
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}
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const blacklist = polygonFeature.polygon === "blacklist"
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result.set(key, {values: new Set<string>(polygonFeature.values), blacklist: blacklist})
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}
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return result;
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}
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// The centerpoint of the feature, as [lat, lon]
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public abstract centerpoint(): [number, number];
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public abstract asGeoJson(): any;
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abstract SaveExtraData(element: any, allElements: OsmObject[]);
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/**
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* Generates the changeset-XML for tags
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* @constructor
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*/
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TagsXML(): string {
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let tags = "";
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for (const key in this.tags) {
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if (key.startsWith("_")) {
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continue;
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}
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if (key === "id") {
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continue;
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}
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const v = this.tags[key];
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if (v !== "" && v !== undefined) {
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tags += ' <tag k="' + Utils.EncodeXmlValue(key) + '" v="' + Utils.EncodeXmlValue(this.tags[key]) + '"/>\n'
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}
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}
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return tags;
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}
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abstract ChangesetXML(changesetId: string): string;
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protected VersionXML() {
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if (this.version === undefined) {
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return "";
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}
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return 'version="' + this.version + '"';
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}
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private LoadData(element: any): void {
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this.tags = element.tags ?? this.tags;
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this.version = element.version;
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this.timestamp = element.timestamp;
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const tgs = this.tags;
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if (element.tags === undefined) {
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// Simple node which is part of a way - not important
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return;
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}
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tgs["_last_edit:contributor"] = element.user
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tgs["_last_edit:contributor:uid"] = element.uid
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tgs["_last_edit:changeset"] = element.changeset
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tgs["_last_edit:timestamp"] = element.timestamp
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tgs["_version_number"] = element.version
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tgs["id"] = this.type + "/" + this.id;
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}
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}
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export class OsmNode extends OsmObject {
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lat: number;
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lon: number;
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constructor(id: number) {
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super("node", id);
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}
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ChangesetXML(changesetId: string): string {
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let tags = this.TagsXML();
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return ' <node id="' + this.id + '" changeset="' + changesetId + '" ' + this.VersionXML() + ' lat="' + this.lat + '" lon="' + this.lon + '">\n' +
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tags +
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' </node>\n';
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}
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SaveExtraData(element) {
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this.lat = element.lat;
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this.lon = element.lon;
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}
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centerpoint(): [number, number] {
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return [this.lat, this.lon];
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}
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asGeoJson() {
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return {
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"type": "Feature",
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"properties": this.tags,
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"geometry": {
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"type": "Point",
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"coordinates": [
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this.lon,
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this.lat
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]
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}
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}
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}
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}
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export class OsmWay extends OsmObject {
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nodes: number[] = [];
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// The coordinates of the way, [lat, lon][]
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coordinates: [number, number][] = []
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lat: number;
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lon: number;
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constructor(id: number) {
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super("way", id);
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}
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centerpoint(): [number, number] {
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return [this.lat, this.lon];
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}
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ChangesetXML(changesetId: string): string {
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let tags = this.TagsXML();
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let nds = "";
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for (const node in this.nodes) {
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nds += ' <nd ref="' + this.nodes[node] + '"/>\n';
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}
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return ' <way id="' + this.id + '" changeset="' + changesetId + '" ' + this.VersionXML() + '>\n' +
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nds +
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tags +
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' </way>\n';
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}
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SaveExtraData(element, allNodes: OsmNode[]) {
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let latSum = 0
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let lonSum = 0
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const nodeDict = new Map<number, OsmNode>()
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for (const node of allNodes) {
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nodeDict.set(node.id, node)
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}
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if (element.nodes === undefined) {
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console.log("PANIC")
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}
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for (const nodeId of element.nodes) {
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const node = nodeDict.get(nodeId)
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if (node === undefined) {
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console.error("Error: node ", nodeId, "not found in ", nodeDict)
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// This is probably part of a relation which hasn't been fully downloaded
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continue;
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}
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this.coordinates.push(node.centerpoint());
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latSum += node.lat
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lonSum += node.lon
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}
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let count = this.coordinates.length;
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this.lat = latSum / count;
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this.lon = lonSum / count;
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this.nodes = element.nodes;
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}
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public asGeoJson() {
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let coordinates: ([number, number][] | [number, number][][]) = this.coordinates.map(([lat, lon]) => [lon, lat]);
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if (this.isPolygon()) {
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coordinates = [coordinates]
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}
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return {
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"type": "Feature",
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"properties": this.tags,
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"geometry": {
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"type": this.isPolygon() ? "Polygon" : "LineString",
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"coordinates": coordinates
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}
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}
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}
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private isPolygon(): boolean {
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if (this.coordinates[0] !== this.coordinates[this.coordinates.length - 1]) {
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return false; // Not closed
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}
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return OsmObject.isPolygon(this.tags)
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}
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}
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export class OsmRelation extends OsmObject {
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public members: {
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type: "node" | "way" | "relation",
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ref: number,
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role: string
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}[];
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constructor(id: number) {
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super("relation", id);
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}
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centerpoint(): [number, number] {
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return [0, 0]; // TODO
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}
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ChangesetXML(changesetId: string): string {
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let members = "";
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for (const member of this.members) {
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members += ' <member type="' + member.type + '" ref="' + member.ref + '" role="' + member.role + '"/>\n';
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}
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let tags = this.TagsXML();
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let cs = ""
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if (changesetId !== undefined) {
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cs = `changeset="${changesetId}"`
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}
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return ` <relation id="${this.id}" ${cs} ${this.VersionXML()}>
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${members}${tags} </relation>
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`;
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}
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SaveExtraData(element) {
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this.members = element.members;
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}
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asGeoJson(): any {
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throw "Not Implemented"
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}
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} |