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import { type Context, IQueryEngine, quadsToGraph, type RDF } from "../rdf.ts";import { resolveContext, resolveEngine } from "../global.ts";import { from, map, of, switchMap } from "../rxjs.ts";
export class QueryEngineProxy {  private readonly context: Context;  private readonly engine: IQueryEngine;
  constructor(context?: Context, engine?: IQueryEngine) {    this.context = resolveContext(context);    this.engine = resolveEngine(engine);  }
  queryBoolean(query: string) {    return from(this.engine.queryBoolean(query, this.context));  }
  queryBindings(query: string) {    return from(this.engine.queryBindings(query, this.context)).pipe(      switchMap((stream) => of(Array.from(stream as any) as RDF.Bindings[])),    );  }
  queryGraph(query: string) {    return from(this.engine.queryQuads(query, this.context)).pipe(      switchMap((stream) => of(Array.from(stream as any) as RDF.Quad[])),      map((quads) => {        return quadsToGraph(quads);      }),    );  }
  queryVoid(query: string) {    return from(this.engine.queryVoid(query, this.context));  }}