MapComplete/Logic/FeatureSource/TiledFeatureSource/FullNodeDatabaseSource.ts

import TileHierarchy from "./TileHierarchy";
import FeatureSource, {FeatureSourceForLayer, Tiled} from "../FeatureSource";
import {OsmNode, OsmObject, OsmWay} from "../../Osm/OsmObject";
import SimpleFeatureSource from "../Sources/SimpleFeatureSource";
import FilteredLayer from "../../../Models/FilteredLayer";


export default class FullNodeDatabaseSource implements TileHierarchy<FeatureSource & Tiled> {
    public readonly loadedTiles = new Map<number, FeatureSource & Tiled>()
    private readonly onTileLoaded: (tile: (Tiled & FeatureSourceForLayer)) => void;
    private readonly layer: FilteredLayer

    constructor(
        layer: FilteredLayer,
        onTileLoaded: ((tile: Tiled & FeatureSourceForLayer) => void)) {
        this.onTileLoaded = onTileLoaded
        this.layer = layer;
        if (this.layer === undefined) {
            throw "Layer is undefined"
        }
    }
    
    public handleOsmJson(osmJson: any, tileId: number) {

        const allObjects = OsmObject.ParseObjects(osmJson.elements)
        const nodesById = new Map<number, OsmNode>()

        for (const osmObj of allObjects) {
            if (osmObj.type !== "node") {
                continue
            }
            const osmNode = <OsmNode>osmObj;
            nodesById.set(osmNode.id, osmNode)
        }

        const parentWaysByNodeId = new Map<number, OsmWay[]>()
        for (const osmObj of allObjects) {
            if (osmObj.type !== "way") {
                continue
            }
            const osmWay = <OsmWay>osmObj;
            for (const nodeId of osmWay.nodes) {

                if (!parentWaysByNodeId.has(nodeId)) {
                    parentWaysByNodeId.set(nodeId, [])
                }
                parentWaysByNodeId.get(nodeId).push(osmWay)
            }
        }
        parentWaysByNodeId.forEach((allWays, nodeId) => {
            nodesById.get(nodeId).tags["parent_ways"] = JSON.stringify(allWays.map(w => w.tags))
        })
        const now = new Date()
        const asGeojsonFeatures = Array.from(nodesById.values()).map(osmNode => ({
            feature: osmNode.asGeoJson(), freshness: now
        }))

        const featureSource = new SimpleFeatureSource(this.layer, tileId)
        featureSource.features.setData(asGeojsonFeatures)
        this.loadedTiles.set(tileId, featureSource)
        this.onTileLoaded(featureSource)

    }


}