import State from "../../State"; export interface Relation { id: number, type: "relation" members: { type: ("way" | "node" | "relation"), ref: number, role: string }[], tags: any, // Alias for tags; tags == properties properties: any } export default class ExtractRelations { public static RegisterRelations(overpassJson: any) : void{ const memberships = ExtractRelations.BuildMembershipTable(ExtractRelations.GetRelationElements(overpassJson)) console.log("Assigned memberships: ", memberships) State.state.knownRelations.setData(memberships) } /** * Gets an overview of the relations - except for multipolygons. We don't care about those * @param overpassJson * @constructor */ public static GetRelationElements(overpassJson: any): Relation[] { const relations = overpassJson.elements .filter(element => element.type === "relation" && element.tags.type !== "multipolygon") for (const relation of relations) { relation.properties = relation.tags } return relations } /** * Build a mapping of {memberId --> {role in relation, id of relation} } * @param relations * @constructor */ private static BuildMembershipTable(relations: Relation[]): Map { const memberships = new Map() for (const relation of relations) { for (const member of relation.members) { const role = { role: member.role, relation: relation } const key = member.type + "/" + member.ref if (!memberships.has(key)) { memberships.set(key, []) } memberships.get(key).push(role) } } return memberships } }