Class RepositoryTripleSource

    • Constructor Detail

      • RepositoryTripleSource

        public RepositoryTripleSource​(RepositoryConnection repo,
                                      boolean includeInferred)
    • Method Detail

      • getStatements

        public CloseableIteration<? extends Statement> getStatements​(Resource subj,
                                                                     IRI pred,
                                                                     Value obj,
                                                                     Resource... contexts)
                                                              throws QueryEvaluationException
        Description copied from interface: TripleSource
        Gets all statements that have a specific subject, predicate and/or object. All three parameters may be null to indicate wildcards. Optionally a (set of) context(s) may be specified in which case the result will be restricted to statements matching one or more of the specified contexts.
        Specified by:
        getStatements in interface TripleSource
        Parameters:
        subj - A Resource specifying the subject, or null for a wildcard.
        pred - A IRI specifying the predicate, or null for a wildcard.
        obj - A Value specifying the object, or null for a wildcard.
        contexts - The context(s) to get the statements from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.
        Returns:
        An iterator over the relevant statements.
        Throws:
        QueryEvaluationException - If the triple source failed to get the statements.
      • getValueFactory

        public ValueFactory getValueFactory()
        Description copied from interface: TripleSource
        Gets a ValueFactory object that can be used to create IRI-, blank node- and literal objects.
        Specified by:
        getValueFactory in interface TripleSource
        Returns:
        a ValueFactory object for this TripleSource.
      • getComparator

        public Comparator<Value> getComparator()
        Description copied from interface: TripleSource
        Different underlying datastructures may have different ways of ordering statements. On-disk stores typically use a long to represent a value and only stores the actual value in a dictionary, in this case the order would be the order that values where inserted into the dictionary. Stores that instead store values in SPARQL-order can return an instance of ValueComparator which may allow for further optimizations.

        Note that this method is experimental and may be changed or removed without notice.

        Specified by:
        getComparator in interface TripleSource
        Returns:
        a comparator that matches the order of values in the store