Example #1
0
  @Override
  public void build(
      PropFuncArg argSubject, Node predicate, PropFuncArg argObject, ExecutionContext execCxt) {
    super.build(argSubject, predicate, argObject, execCxt);
    DatasetGraph dsg = execCxt.getDataset();
    textIndex = chooseTextIndex(dsg);

    if (argSubject.isList()) {
      int size = argSubject.getArgListSize();
      if (size != 2 && size != 3) {
        throw new QueryBuildException(
            "Subject has "
                + argSubject.getArgList().size()
                + " elements, not 2 or 3: "
                + argSubject);
      }
    }

    if (argObject.isList()) {
      List<Node> list = argObject.getArgList();

      if (list.size() == 0) throw new QueryBuildException("Zero-length argument list");

      if (list.size() > 4) throw new QueryBuildException("Too many arguments in list : " + list);

      // extract of extra lang arg if present and if is usable.
      // arg is removed from the list to avoid conflict with order and args length
      langArg = extractArg("lang", list);

      if (langArg != null && textIndex.getDocDef().getLangField() == null)
        log.warn("lang argument is ignored if langField not set in the index configuration");
    }
  }
Example #2
0
  @Override
  public QueryIterator exec(
      Binding binding,
      PropFuncArg argSubject,
      Node predicate,
      PropFuncArg argObject,
      ExecutionContext execCxt) {
    if (textIndex == null) {
      if (!warningIssued) {
        Log.warn(getClass(), "No text index - no text search performed");
        warningIssued = true;
      }
      // Not a text dataset - no-op
      return IterLib.result(binding, execCxt);
    }

    DatasetGraph dsg = execCxt.getDataset();

    argSubject = Substitute.substitute(argSubject, binding);
    argObject = Substitute.substitute(argObject, binding);

    Node s = null;
    Node score = null;
    Node literal = null;

    if (argSubject.isList()) {
      // Length checked in build()
      s = argSubject.getArg(0);
      score = argSubject.getArg(1);

      if (!score.isVariable())
        throw new QueryExecException("Hit score is not a variable: " + argSubject);

      if (argSubject.getArgListSize() > 2) {
        literal = argSubject.getArg(2);
        if (!literal.isVariable())
          throw new QueryExecException("Hit literal is not a variable: " + argSubject);
      }
    } else {
      s = argSubject.getArg();
    }

    if (s.isLiteral())
      // Does not match
      return IterLib.noResults(execCxt);

    StrMatch match = objectToStruct(argObject, true);
    if (match == null) {
      // can't match
      return IterLib.noResults(execCxt);
    }

    // ----

    QueryIterator qIter =
        (Var.isVar(s))
            ? variableSubject(binding, s, score, literal, match, execCxt)
            : concreteSubject(binding, s, score, literal, match, execCxt);
    if (match.getLimit() >= 0) qIter = new QueryIterSlice(qIter, 0, match.getLimit(), execCxt);
    return qIter;
  }