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UDN/auxilary.ts
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2024-07-04 16:39:52 +02:00
export class TwoWayMap<A, B> {
private mapAtoB = new Map<A, Set<B>>();
private mapBtoA = new Map<B, Set<A>>();
// prepare
private prepareA(a: A) {
if (this.mapAtoB.has(a)) return;
this.mapAtoB.set(a, new Set());
}
private prepareB(b: B) {
if (this.mapBtoA.has(b)) return;
this.mapBtoA.set(b, new Set());
}
// utility
private getListOnA(a: A) {
return this.mapAtoB.get(a);
}
private getListOnB(b: B) {
return this.mapBtoA.get(b);
}
// public
set(a: A, b: B) {
this.prepareA(a);
this.prepareB(b);
this.getListOnA(a)?.add(b);
this.getListOnB(b)?.add(a);
}
delete(a: A, b: B) {
this.getListOnA(a)?.delete(b);
this.getListOnB(b)?.delete(a);
}
}