import { DirectedGraph } from 'graphology';
import { CloudEvent } from '../models';
/**
 * The Graph resolver is a component that is used to resolve
 * a cloud event into a graph representation.
 */
export declare class GraphResolver {
    private event;
    /**
     * Graph resolver constructor.
     * @param event the cloud event to resolve.
     */
    constructor(event: CloudEvent);
    /**
     * A helper function that returns the name of the document.
     * @param document the document instance.
     * @param metadata the metadata of the document.
     * @returns the name of the document.
     */
    private getName;
    /**
     * Adds the current document to the graph with
     * its attributes.
     * @param graph the graph instance.
     * @returns a reference to the graph resolver.
     */
    private addDocument;
    /**
     * Adds the source document to the graph.
     * @param graph the graph instance.
     * @returns a reference to the graph resolver.
     */
    private addSource;
    /**
     * Adds the language of the document to the graph
     * as a separate node.
     * @param graph the graph instance.
     * @param document the document instance.
     * @returns a reference to the graph resolver.
     */
    private addLanguage;
    /**
     * Adds the topics of the document to the graph
     * as separate nodes.
     * @param graph the graph instance.
     * @param document the document instance.
     * @returns a reference to the graph resolver.
     */
    private addTopics;
    /**
     * Adds the publisher of the document to the graph
     * as a separate node.
     * @param graph the graph instance.
     * @param document the document instance.
     * @returns a reference to the graph resolver.
     */
    private addPublisher;
    /**
     * Adds the authors of the document to the graph
     * as separate nodes.
     * @param graph the graph instance.
     * @param document the document instance.
     * @returns a reference to the graph resolver.
     */
    private addAuthors;
    /**
     * Adds the class of the document to the graph
     * as a separate node.
     * @param graph the graph instance.
     * @param document the document instance.
     * @returns a reference to the graph resolver.
     */
    private addClass;
    /**
     * Adds the kind of the document to the graph
     * as a separate node.
     * @param graph the graph instance.
     * @param document the document instance.
     * @returns a reference to the graph resolver.
     */
    private addKind;
    /**
     * Adds the custom ontology to the graph.
     * @param graph the graph instance.
     * @param document the document instance.
     * @returns a reference to the graph resolver.
     */
    private addCustomOntology;
    /**
     * Resolve the cloud event into a graph representation.
     * @returns a graph representation of the cloud event.
     */
    resolve(): Promise<DirectedGraph>;
}