63 lines
1.9 KiB
TypeScript
63 lines
1.9 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 = [];
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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[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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if (elementId in this._elements) {
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const es = this._elements[elementId];
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if (es.data == feature.properties) {
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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 add all the new keys to the old keys
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let somethingChanged = false;
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for (const k in feature.properties) {
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const v = feature.properties[k];
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if (keptKeys[k] !== v) {
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keptKeys[k] = v;
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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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} else {
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const eventSource = new UIEventSource<any>(feature.properties, "tags of " + feature.properties.id);
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this._elements[feature.properties.id] = eventSource;
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return eventSource;
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}
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}
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getEventSourceById(elementId): UIEventSource<any> {
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if (elementId in this._elements) {
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return this._elements[elementId];
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}
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console.error("Can not find eventsource with id ", elementId);
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}
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} |