graph-explorer/src/graph-explorer/data/sparql/sparqlGraphBuilder.ts

Graph Explorer can be used to explore and RDF graphs in SPARQL endpoints or on the web.

import { SerializedDiagram } from "../../editor/serializedDiagram";

import { Dictionary, ElementModel } from "../model";

import { GraphBuilder } from "./graphBuilder";
import { SparqlDataProvider } from "./sparqlDataProvider";

const DEFAULT_PREFIX =
  `PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
 PREFIX rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
 PREFIX owl:  <http://www.w3.org/2002/07/owl#>` + "\n\n";

export class SparqlGraphBuilder {
  graphBuilder: GraphBuilder;

  constructor(public dataProvider: SparqlDataProvider) {
    this.graphBuilder = new GraphBuilder(dataProvider);
  }

  getGraphFromConstruct(constructQuery: string): Promise<{
    preloadedElements: Dictionary<ElementModel>;
    diagram: SerializedDiagram;
  }> {
    const query = DEFAULT_PREFIX + constructQuery;
    return this.dataProvider
      .executeSparqlConstruct(query)
      .then((graph) => this.graphBuilder.getGraphFromRDFGraph(graph));
  }
}