如何在Java/Kotlin的GraphDB插件中查询当前活动仓库？

我正在使用GraphDB的Plugin API开发插件，需要从当前活动的GraphDB仓库中检索部分语句做后续处理，想要执行的SPARQL查询如下：

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
prefix proof: <http://www.ontotext.com/proof/>
select ?rule ?s ?p ?o ?context where {
    values (?subject ?predicate ?object) {(<urn:Mary> <urn:hasChild> <urn:John>)}
    ?ctx proof:explain (?subject ?predicate ?object) .
    ?ctx proof:rule ?rule .
    ?ctx proof:subject ?s .
    ?ctx proof:predicate ?p .
    ?ctx proof:object ?o .
    ?ctx proof:context ?context .
}

该查询需由proof plugin处理，只要查询格式正确且插件在目标仓库上运行即可自动生效。

RDF4J提供了向RepositoryConnection对象发送查询的示例代码：

Repository db = new SailRepository(new MemoryStore());

// Open a connection to the database
try (RepositoryConnection conn = db.getConnection()) {
  String filename = "example-data-artists.ttl";
  try (InputStream input = Example15SimpleSPARQLQuery.class.getResourceAsStream("/" + filename)) {
    // add the RDF data from the inputstream directly to our database
    conn.add(input, "", RDFFormat.TURTLE);
  }

  // We do a simple SPARQL SELECT-query that retrieves all resources of type `ex:Artist`,
  // and their first names.
  String queryString = "PREFIX ex: <http://example.org/> \n";
  queryString += "PREFIX foaf: <" + FOAF.NAMESPACE + "> \n";
  queryString += "SELECT ?s ?n \n";
  queryString += "WHERE { \n";
  queryString += "    ?s a ex:Artist; \n";
  queryString += "       foaf:firstName ?n .";
  queryString += "}";

  TupleQuery query = conn.prepareTupleQuery(queryString);

  // A QueryResult is also an AutoCloseable resource, so make sure it gets closed when done.
  try (TupleQueryResult result = query.evaluate()) {
    // we just iterate over all solutions in the result...
    for (BindingSet solution : result) {
      // ... and print out the value of the variable binding for ?s and ?n
      System.out.println("?s = " + solution.getValue("s"));
      System.out.println("?n = " + solution.getValue("n"));
    }
  }
} finally {
  // Before our program exits, make sure the database is properly shut down.
  db.shutDown();
}

目前遇到以下问题：

• 无法获取指向当前工作仓库的正确类型对象：插件API使用PluginConnection对象，但它不支持此类查询交互；虽然能列出localhost:7200的所有仓库，但无法区分当前活动仓库，且访问仓库需要知道用户自定义的ID/名称。
• 文档中基于配置文件的方案不可靠：无法确定其在GraphDB安装中的位置，在插件场景下不实用，且无法指明当前被查询的仓库。
• 考虑使用PluginConnection的getStatements()函数，但存在不足：无法实现上述复杂查询的逻辑，也无法处理如?ctx proof:explain (?subject ?predicate ?object) .这类含RDF列表的语句。

内容的提问来源于stack exchange，提问作者Andrea Corradetti