Package org.eclipse.rdf4j.sail.base

Interface SailDataset

All Superinterfaces:
AutoCloseable, SailClosable
public interface SailDataset extends SailClosable
A state of an SailSource at a point in time that will remain consistent until close() is called. The life cycle follows that of a read operation.
Author:
James Leigh

  • Method Details

    • close

      void close() throws SailException
      Called when this SailDataset is no longer is used, such as when a read operation is complete. An isolation level compatible with IsolationLevels.SNAPSHOT will ensure the state of this SailDataset dose not change between the first call to this object until SailClosable#release() is called.
      Specified by:
      close in interface AutoCloseable
      Specified by:
      close in interface SailClosable
      Throws:
      SailException - if this resource cannot be closed

    • getNamespaces

      CloseableIteration<? extends Namespace,​SailException> getNamespaces() throws SailException
      Gets the namespaces relevant to the data contained in this object.
      Returns:
      An iterator over the relevant namespaces, should not contain any duplicates.
      Throws:
      SailException - If this object encountered an error or unexpected situation internally.

    • getNamespace

      String getNamespace​(String prefix) throws SailException
      Gets the namespace that is associated with the specified prefix, if any.
      Parameters:
      prefix - A namespace prefix, or an empty string in case of the default namespace.
      Returns:
      The namespace name that is associated with the specified prefix, or null if there is no such namespace.
      Throws:
      SailException - If this object encountered an error or unexpected situation internally.
      NullPointerException - In case prefix is null.

    • getContextIDs

      CloseableIteration<? extends Resource,​SailException> getContextIDs() throws SailException
      Returns the set of all unique context identifiers that are used to store statements.
      Returns:
      An iterator over the context identifiers, should not contain any duplicates.
      Throws:
      SailException

    • getStatements

      CloseableIteration<? extends Statement,​SailException> getStatements​(Resource subj, IRI pred, Value obj, Resource... contexts) throws SailException
      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.
      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 all contexts.
      Returns:
      An iterator over the relevant statements.
      Throws:
      SailException - If the triple source failed to get the statements.

    • getTriples

      default CloseableIteration<? extends Triple,​SailException> getTriples​(Resource subj, IRI pred, Value obj) throws SailException
      Gets all RDF-star triples that have a specific subject, predicate and/or object. All three parameters may be null to indicate wildcards.
      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.
      Returns:
      An iterator over the relevant triples.
      Throws:
      SailException - If the triple source failed to get the RDF-star triples.