mapcomplete/Logic/ElementStorage.ts

63 lines
No EOL
1.9 KiB
TypeScript

/**
* Keeps track of a dictionary 'elementID' -> UIEventSource<tags>
*/
import {UIEventSource} from "./UIEventSource";
export class ElementStorage {
private _elements = [];
constructor() {
}
addElementById(id: string, eventSource: UIEventSource<any>) {
this._elements[id] = eventSource;
}
/**
* Creates a UIEventSource for the tags of the given feature.
* If an UIEventsource has been created previously, the same UIEventSource will be returned
*
* Note: it will cleverly merge the tags, if needed
*/
addOrGetElement(feature: any): UIEventSource<any> {
const elementId = feature.properties.id;
if (elementId in this._elements) {
const es = this._elements[elementId];
if (es.data == feature.properties) {
// Reference comparison gives the same object! we can just return the event source
return es;
}
const keptKeys = es.data;
// The element already exists
// We add all the new keys to the old keys
let somethingChanged = false;
for (const k in feature.properties) {
const v = feature.properties[k];
if (keptKeys[k] !== v) {
keptKeys[k] = v;
somethingChanged = true;
}
}
if (somethingChanged) {
es.ping();
}
return es;
} else {
const eventSource = new UIEventSource<any>(feature.properties, "tags of " + feature.properties.id);
this._elements[feature.properties.id] = eventSource;
return eventSource;
}
}
getEventSourceById(elementId): UIEventSource<any> {
if (elementId in this._elements) {
return this._elements[elementId];
}
console.error("Can not find eventsource with id ", elementId);
}
}