Class UnionSailDataset

java.lang.Object
org.eclipse.rdf4j.sail.base.UnionSailDataset
All Implemented Interfaces:
AutoCloseable, SailClosable, SailDataset
class UnionSailDataset extends Object implements SailDataset
Combines two SailDataset into a single view.

  • Field Details

  • Constructor Details

  • Method Details

    • getInstance

      public static SailDataset getInstance(SailDataset dataset1, SailDataset dataset2)
      Creates a new SailDataset that includes both the provided SailDatasets.

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • close

      public void close() throws SailException
      Description copied from interface: SailDataset
      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
      invalid reference 
      SailClosable#release()
      is called.
      Specified by:
      close in interface AutoCloseable
      Specified by:
      close in interface SailClosable
      Specified by:
      close in interface SailDataset
      Throws:
      SailException - if this resource cannot be closed

    • getNamespaces

      public CloseableIteration<? extends Namespace, SailException> getNamespaces() throws SailException
      Description copied from interface: SailDataset
      Gets the namespaces relevant to the data contained in this object.
      Specified by:
      getNamespaces in interface SailDataset
      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

      public String getNamespace(String prefix) throws SailException
      Description copied from interface: SailDataset
      Gets the namespace that is associated with the specified prefix, if any.
      Specified by:
      getNamespace in interface SailDataset
      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.

    • getContextIDs

      public CloseableIteration<? extends Resource, SailException> getContextIDs() throws SailException
      Description copied from interface: SailDataset
      Returns the set of all unique context identifiers that are used to store statements.
      Specified by:
      getContextIDs in interface SailDataset
      Returns:
      An iterator over the context identifiers, should not contain any duplicates.
      Throws:
      SailException

    • getStatements

      public CloseableIteration<? extends Statement, SailException> getStatements(Resource subj, IRI pred, Value obj, Resource... contexts) throws SailException
      Description copied from interface: SailDataset
      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 SailDataset
      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

      public CloseableIteration<? extends Triple, SailException> getTriples(Resource subj, IRI pred, Value obj) throws SailException
      Description copied from interface: SailDataset
      Gets all RDF-star triples that have a specific subject, predicate and/or object. All three parameters may be null to indicate wildcards.
      Specified by:
      getTriples in interface SailDataset
      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.

    • union

      private <T> CloseableIteration<? extends T, SailException> union(CloseableIteration<? extends T, SailException> iteration1, CloseableIteration<? extends T, SailException> iteration2)