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import { type Context, IQueryEngine, quadsToGraph, type RDF } from "../rdf.ts";import { resolveContext, resolveEngine } from "../global.ts";import { type AsyncIterator } from "../asynciterator.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 this.engine.queryBoolean(query, this.context);  }
  async queryBindings(query: string) {    const bindingsStream = await this.engine.queryBindings(      query,      this.context,    ) as unknown as AsyncIterator<RDF.Bindings>;    return bindingsStream.toArray();  }
  async queryGraph(query: string) {    const quadStream = await this.engine.queryQuads(      query,      this.context,    ) as unknown as AsyncIterator<RDF.Quad>;    const quads = await (quadStream.toArray());    return quadsToGraph(quads);  }
  queryVoid(query: string) {    return this.engine.queryVoid(query, this.context);  }}