100 lines
No EOL
3.1 KiB
TypeScript
100 lines
No EOL
3.1 KiB
TypeScript
/**
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* Keeps track of a dictionary 'elementID' -> UIEventSource<tags>
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*/
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import {UIEventSource} from "./UIEventSource";
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export class ElementStorage {
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private _elements = new Map<string, UIEventSource<any>>();
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public ContainingFeatures = new Map<string, any>();
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constructor() {
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}
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addElementById(id: string, eventSource: UIEventSource<any>) {
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this._elements.set(id, eventSource);
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}
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/**
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* Creates a UIEventSource for the tags of the given feature.
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* If an UIEventsource has been created previously, the same UIEventSource will be returned
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*
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* Note: it will cleverly merge the tags, if needed
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*/
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addOrGetElement(feature: any): UIEventSource<any> {
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const elementId = feature.properties.id;
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const newProperties = feature.properties;
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const es = this.addOrGetById(elementId, newProperties)
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// At last, we overwrite the tag of the new feature to use the tags in the already existing event source
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feature.properties = es.data
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if(!this.ContainingFeatures.has(elementId)){
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this.ContainingFeatures.set(elementId, feature);
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}
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return es;
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}
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getEventSourceById(elementId): UIEventSource<any> {
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if (this._elements.has(elementId)) {
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return this._elements.get(elementId);
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}
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console.error("Can not find eventsource with id ", elementId);
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return undefined;
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}
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has(id) {
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return this._elements.has(id);
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}
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private addOrGetById(elementId: string, newProperties: any): UIEventSource<any> {
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if (!this._elements.has(elementId)) {
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const eventSource = new UIEventSource<any>(newProperties, "tags of " + elementId);
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this._elements.set(elementId, eventSource);
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return eventSource;
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}
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const es = this._elements.get(elementId);
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if (es.data == newProperties) {
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// Reference comparison gives the same object! we can just return the event source
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return es;
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}
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const keptKeys = es.data;
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// The element already exists
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// We use the new feature to overwrite all the properties in the already existing eventsource
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const debug_msg = []
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let somethingChanged = false;
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for (const k in newProperties) {
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if(!newProperties.hasOwnProperty(k)){
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continue;
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}
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const v = newProperties[k];
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if (keptKeys[k] !== v) {
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if (v === undefined) {
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// The new value is undefined; the tag might have been removed
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// It might be a metatag as well
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// In the latter case, we do keep the tag!
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if (!k.startsWith("_")) {
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delete keptKeys[k]
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debug_msg.push(("Erased " + k))
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}
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} else {
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keptKeys[k] = v;
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debug_msg.push(k + " --> " + v)
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}
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somethingChanged = true;
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}
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}
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if (somethingChanged) {
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es.ping();
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}
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return es;
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}
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} |