Package org.eclipse.rdf4j.sail.evaluation

Class SailTripleSource

java.lang.Object
org.eclipse.rdf4j.sail.evaluation.SailTripleSource
All Implemented Interfaces:
AvailableStatementOrder, TripleSource
public class SailTripleSource extends Object implements TripleSource

  • Constructor Details

  • Method Details

    • 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.

    • getStatements

      public CloseableIteration<? extends Statement> getStatements(StatementOrder order, 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.

      Statements are returned in the order specified by the statementOrder parameter. Use TripleSource.getSupportedOrders(Resource, IRI, Value, Resource...) to first retrieve the statement orders supported by this store for this statement pattern.

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

      Specified by:
      getStatements in interface TripleSource
      Parameters:
      order - The order in which the statements should be returned.
      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 ordered iterator over the relevant statements.
      Throws:
      QueryEvaluationException - If the triple source failed to get the statements.

    • getSupportedOrders

      public Set<StatementOrder> getSupportedOrders(Resource subj, IRI pred, Value obj, Resource... contexts)
      Description copied from interface: TripleSource
      The underlying store may support some, but not all, statement orders based on the statement pattern. This method can be used to determine which orders are supported for a given statement pattern. The supported orders can be used to retrieve statements in a specific order using TripleSource.getStatements(StatementOrder, Resource, IRI, Value, Resource...) .

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

      Specified by:
      getSupportedOrders in interface AvailableStatementOrder
      Specified by:
      getSupportedOrders 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 data from. Note that this parameter is a vararg and as such is optional. If no contexts are specified the method operates on the entire repository. A null value can be used to match context-less statements.
      Returns:
      a set of supported statement orders

    • 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