mapcomplete/Logic/Osm/ExtractRelations.ts

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2021-04-18 14:24:30 +02:00
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))
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")
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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
*/
public static BuildMembershipTable(relations: Relation[]): Map<string, { role: string, relation: Relation }[]> {
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const memberships = new Map<string, { role: string, relation: Relation }[]>()
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
}
}