forked from MapComplete/MapComplete
112 lines
3.6 KiB
TypeScript
112 lines
3.6 KiB
TypeScript
import { FeatureSource } from "../FeatureSource"
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import { UIEventSource } from "../../UIEventSource"
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/**
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* Constructs a UIEventStore for the properties of every Feature, indexed by id
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*/
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export default class FeaturePropertiesStore {
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private readonly _elements = new Map<string, UIEventSource<Record<string, string>>>()
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constructor(...sources: FeatureSource[]) {
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for (const source of sources) {
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this.trackFeatureSource(source)
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}
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}
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public getStore(id: string): UIEventSource<Record<string, string>> {
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return this._elements.get(id)
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}
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public trackFeatureSource(source: FeatureSource) {
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const self = this
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source.features.addCallbackAndRunD((features) => {
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for (const feature of features) {
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const id = feature.properties.id
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if (id === undefined) {
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console.trace("Error: feature without ID:", feature)
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throw "Error: feature without ID"
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}
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const source = self._elements.get(id)
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if (source === undefined) {
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self._elements.set(id, new UIEventSource<any>(feature.properties))
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continue
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}
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if (source.data === feature.properties) {
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continue
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}
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// Update the tags in the old store and link them
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const changeMade = FeaturePropertiesStore.mergeTags(source.data, feature.properties)
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feature.properties = source.data
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if (changeMade) {
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source.ping()
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}
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}
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})
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}
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/**
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* Overwrites the tags of the old properties object, returns true if a change was made.
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* Metatags are overriden if they are in the new properties, but not removed
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* @param oldProperties
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* @param newProperties
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* @private
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*/
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private static mergeTags(
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oldProperties: Record<string, any>,
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newProperties: Record<string, any>
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): boolean {
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let changeMade = false
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for (const oldPropertiesKey in oldProperties) {
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// Delete properties from the old record if it is not in the new store anymore
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if (oldPropertiesKey.startsWith("_")) {
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continue
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}
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if (newProperties[oldPropertiesKey] === undefined) {
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changeMade = true
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delete oldProperties[oldPropertiesKey]
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}
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}
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// Copy all properties from the new record into the old
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for (const newPropertiesKey in newProperties) {
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const v = newProperties[newPropertiesKey]
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if (oldProperties[newPropertiesKey] !== v) {
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oldProperties[newPropertiesKey] = v
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changeMade = true
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}
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}
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return changeMade
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}
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// noinspection JSUnusedGlobalSymbols
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public addAlias(oldId: string, newId: string): void {
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if (newId === undefined) {
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// We removed the node/way/relation with type 'type' and id 'oldId' on openstreetmap!
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const element = this._elements.get(oldId)
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element.data._deleted = "yes"
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element.ping()
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return
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}
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if (oldId == newId) {
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return
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}
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const element = this._elements.get(oldId)
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if (element === undefined) {
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// Element to rewrite not found, probably a node or relation that is not rendered
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return
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}
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element.data.id = newId
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this._elements.set(newId, element)
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element.ping()
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}
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has(id: string) {
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return this._elements.has(id)
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}
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}
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