Class AbstractRDFInserter

java.lang.Object
org.eclipse.rdf4j.rio.helpers.AbstractRDFHandler
org.eclipse.rdf4j.repository.util.AbstractRDFInserter
All Implemented Interfaces:
RDFHandler
Direct Known Subclasses:
RDFInferencerInserter, RDFInserter, RDFSailInserter
public abstract class AbstractRDFInserter extends AbstractRDFHandler
An RDFHandler that adds RDF data to some RDF sink.

  • Field Details

    • contexts

      protected Resource[] contexts
      The contexts to add the statements to. If this variable is a non-empty array, statements will be added to the corresponding contexts.

    • preserveBNodeIDs

      private boolean preserveBNodeIDs
      Flag indicating whether blank node IDs should be preserved.

    • namespaceMap

      private final Map<String,String> namespaceMap
      Map that stores namespaces that are reported during the evaluation of the query. Key is the namespace prefix, value is the namespace name.

    • bNodesMap

      private final Map<String,BNode> bNodesMap
      Map used to keep track of which blank node IDs have been mapped to which BNode object in case preserveBNodeIDs is false.

    • valueFactory

      private final ValueFactory valueFactory
      ValueFactory used to create BNodes.

  • Constructor Details

    • AbstractRDFInserter

      protected AbstractRDFInserter(ValueFactory vf)
      Creates a new RDFInserter object that preserves bnode IDs and that does not enforce any context upon statements that are reported to it.

  • Method Details

    • setPreserveBNodeIDs

      public void setPreserveBNodeIDs(boolean preserveBNodeIDs)
      Sets whether this RDFInserter should preserve blank node IDs.
      Parameters:
      preserveBNodeIDs - The new value for this flag.

    • preservesBNodeIDs

      public boolean preservesBNodeIDs()
      Checks whether this RDFInserter preserves blank node IDs.

    • enforceContext

      public void enforceContext(Resource... contexts)
      Enforces the supplied contexts upon all statements that are reported to this RDFInserter.
      Parameters:
      contexts - the contexts to use. Use an empty array (not null!) to indicate no context(s) should be enforced.

    • enforcesContext

      public boolean enforcesContext()
      Checks whether this RDFInserter enforces its contexts upon all statements that are reported to it.
      Returns:
      true if it enforces its contexts, false otherwise.

    • getContexts

      public Resource[] getContexts()
      Gets the contexts that this RDFInserter enforces upon all statements that are reported to it (in case enforcesContext() returns true).
      Returns:
      A Resource[] identifying the contexts, or an empty array if no contexts is enforced.

    • addNamespace

      protected abstract void addNamespace(String prefix, String name) throws RDF4JException
      Throws:
      RDF4JException

    • addStatement

      protected abstract void addStatement(Resource subj, IRI pred, Value obj, Resource ctxt) throws RDF4JException
      Throws:
      RDF4JException

    • endRDF

      public void endRDF() throws RDFHandlerException
      Description copied from interface: RDFHandler
      Signals the end of the RDF data. This method is called when all data has been reported.
      Specified by:
      endRDF in interface RDFHandler
      Overrides:
      endRDF in class AbstractRDFHandler
      Throws:
      RDFHandlerException - If the RDF handler has encountered an unrecoverable error.

    • handleNamespace

      public void handleNamespace(String prefix, String name)
      Description copied from interface: RDFHandler
      Handles a namespace declaration/definition. A namespace declaration associates a (short) prefix string with the namespace's URI. The prefix for default namespaces, which do not have an associated prefix, are represented as empty strings.
      Specified by:
      handleNamespace in interface RDFHandler
      Overrides:
      handleNamespace in class AbstractRDFHandler
      Parameters:
      prefix - The prefix for the namespace, or an empty string in case of a default namespace.
      name - The URI that the prefix maps to.

    • handleStatement

      public void handleStatement(Statement st) throws RDFHandlerException
      Description copied from interface: RDFHandler
      Handles a statement.
      Specified by:
      handleStatement in interface RDFHandler
      Overrides:
      handleStatement in class AbstractRDFHandler
      Parameters:
      st - The statement.
      Throws:
      RDFHandlerException - If the RDF handler has encountered an unrecoverable error.

    • mapBNode

      private BNode mapBNode(BNode bNode)
      Maps the supplied BNode, which comes from the data, to a new BNode object. Consecutive calls with equal BNode objects returns the same object everytime.
      Throws:
      RepositoryException