import { Edge, Node, RawRelation } from '../types';
import { DataBase } from './base';
export declare class DataRelation extends DataBase<RawRelation> {
    private nodeMap;
    private edgeMap;
    private _data;
    /**
     * Node data in the relationship graph.
     */
    get nodes(): Node[];
    /**
     * Edge data in the relationship graph.
     */
    get edges(): Edge[];
    /**
     * Start node data in DAG.
     */
    get roots(): Meta[];
    /**
     * Node groups by level.
     */
    get nodeGroups(): Node[][];
    getNode(id: Meta): Node | undefined;
    getEdge(id: Meta): Edge | undefined;
    constructor(source: RawRelation);
    /**
     * Construct discrete node data and edge data into a graph.
     * @param relation
     * Discrete node data and edge data.
     */
    update(relation: RawRelation): void;
    private computeLevel;
    private preprocessNodeLevel;
}