76 lines
2.3 KiB
TypeScript
76 lines
2.3 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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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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return es;
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}
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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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let somethingChanged = false;
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for (const k in newProperties) {
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const v = newProperties[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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}
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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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} |