sparnatural/src/sparnatural/generators/sparql/fromjson/QueryWhereTranslator.ts

Visual client-side SPARQL query builder and knowledge graph exploration tool

import { DataFactory } from "rdf-data-factory";
import { Pattern, Variable } from "sparqljs";
import ISparnaturalSpecification from "../../../spec-providers/ISparnaturalSpecification";
import { ISparJson } from "../../json/ISparJson";
import BranchTranslator from "./BranchTranslator";

const factory = new DataFactory();

export default class QueryWhereTranslator {
  // variables set in construtor
  #jsonQuery: ISparJson;
  #specProvider: ISparnaturalSpecification;

  // patterns built in the build process
  #resultPtrns: Pattern[] = [];
  #executedAfterPtrns: Pattern[] = [];

  // default vars gathered from children
  #defaultVars: Variable[] = [];
  settings: any;

  constructor(
    jsonQuery: ISparJson,
    specProvider: ISparnaturalSpecification,
    settings: any
  ) {
    this.#jsonQuery = jsonQuery;
    this.#specProvider = specProvider;
    this.settings = settings;
  }

  build() {
    if (
      this.#jsonQuery &&
      this.#jsonQuery.branches &&
      this.#specProvider &&
      Array.isArray(this.#jsonQuery.branches)
    ) {
      this.#jsonQuery.branches.forEach((branch, index) => {
        if (branch && this.#jsonQuery && this.#specProvider) {
          let branchBuilder = new BranchTranslator(
            branch,
            this.#jsonQuery,
            this.#specProvider,
            // indicates if it is the very first
            index === 0,
            // they are never inside optional or not exist at the first level
            false,
            // they are never inside optional or not exist at the first level
            this.settings
          );
          branchBuilder.build();
          this.#defaultVars.push(...branchBuilder.getDefaultVars());
          this.#resultPtrns.push(...branchBuilder.getResultPtrns());
        }
      });
    } else {
      console.error("Required variables are missing or invalid");
    }
  }

  getResultPtrns() {
    return this.#resultPtrns;
  }

  getDefaultVars() {
    return this.#defaultVars;
  }

  getExecutedAfterPtrns() {
    return this.#executedAfterPtrns;
  }
}