Interface IRdfJsSourceExtended

interface IRdfJsSourceExtended {
    countQuads?: (
        subject?: Term,
        predicate?: Term,
        object?: Term,
        graph?: Term,
    ) => number | Promise<number>;
    features?: { quotedTripleFiltering?: boolean };
    match(
        subject?: null | Term,
        predicate?: null | Term,
        object?: null | Term,
        graph?: null | Term,
    ): Stream<Quad>;
}

Hierarchy

  • Source
    • IRdfJsSourceExtended

Properties

countQuads? features?

Methods

match

Properties

OptionalcountQuads

countQuads?: (
    subject?: Term,
    predicate?: Term,
    object?: Term,
    graph?: Term,
) => number | Promise<number>

Return an estimated count of the number of quads matching the given pattern.

The better the estimate, the better the query engine will be able to optimize the query.

Type declaration

    • (
          subject?: Term,
          predicate?: Term,
          object?: Term,
          graph?: Term,
      ): number | Promise<number>

    • Parameters

      • Optionalsubject: Term

        An optional subject.

      • Optionalpredicate: Term

        An optional predicate.

      • Optionalobject: Term

        An optional object.

      • Optionalgraph: Term

        An optional graph.

      Returns number | Promise<number>

Optionalfeatures

features?: { quotedTripleFiltering?: boolean }

A record indicating supported features of this source.

Type declaration

  • OptionalquotedTripleFiltering?: boolean

    If true, this source supports passing quad patterns with quoted quad patterns in the match method. If false (or if features is undefined), such quoted quad patterns can not be passed, and must be replaced by undefined and filtered by the caller afterwards.

Methods

match

  • match(
        subject?: null | Term,
        predicate?: null | Term,
        object?: null | Term,
        graph?: null | Term,
    ): Stream<Quad>

  • Returns a stream that processes all quads matching the pattern.

    Parameters

    • Optionalsubject: null | Term

      The optional subject.

    • Optionalpredicate: null | Term

      The optional predicate.

    • Optionalobject: null | Term

      The optional object.

    • Optionalgraph: null | Term

      The optional graph.

    Returns Stream<Quad>

    The resulting quad stream.

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