Package org.eclipse.rdf4j.sail.nativerdf

Class ValueStore

java.lang.Object
org.eclipse.rdf4j.model.base.AbstractValueFactory
org.eclipse.rdf4j.model.impl.SimpleValueFactory
org.eclipse.rdf4j.sail.nativerdf.ValueStore
All Implemented Interfaces:
ValueFactory
@InternalUseOnly public class ValueStore extends SimpleValueFactory
File-based indexed storage and retrieval of RDF values. ValueStore maps RDF values to integer IDs and vice-versa.
Author:
Arjohn Kampman

  • Field Details

    • VALUE_CACHE_SIZE

      public static final int VALUE_CACHE_SIZE
      The default value cache size.
      See Also:

    • VALUE_ID_CACHE_SIZE

      public static final int VALUE_ID_CACHE_SIZE
      The default value id cache size.
      See Also:

    • NAMESPACE_CACHE_SIZE

      public static final int NAMESPACE_CACHE_SIZE
      The default namespace cache size.
      See Also:

    • NAMESPACE_ID_CACHE_SIZE

      public static final int NAMESPACE_ID_CACHE_SIZE
      The default namespace id cache size.
      See Also:

  • Constructor Details

  • Method Details

    • getRevision

      public ValueStoreRevision getRevision()

    • getReadLock

      public Lock getReadLock() throws InterruptedException
      Gets a read lock on this value store that can be used to prevent values from being removed while the lock is active.
      Throws:
      InterruptedException

    • getValue

      public NativeValue getValue(int id) throws IOException
      Gets the value for the specified ID.
      Parameters:
      id - A value ID.
      Returns:
      The value for the ID, or null no such value could be found.
      Throws:
      IOException - If an I/O error occurred.

    • getID

      public int getID(Value value) throws IOException
      Gets the ID for the specified value.
      Parameters:
      value - A value.
      Returns:
      The ID for the specified value, or NativeValue.UNKNOWN_ID if no such ID could be found.
      Throws:
      IOException - If an I/O error occurred.

    • storeValue

      public int storeValue(Value value) throws IOException
      Stores the supplied value and returns the ID that has been assigned to it. In case the value was already present, the value will not be stored again and the ID of the existing value is returned.
      Parameters:
      value - The Value to store.
      Returns:
      The ID that has been assigned to the value.
      Throws:
      IOException - If an I/O error occurred.

    • clear

      public void clear() throws IOException
      Removes all values from the ValueStore.
      Throws:
      IOException - If an I/O error occurred.

    • sync

      public void sync() throws IOException
      Synchronizes any changes that are cached in memory to disk.
      Throws:
      IOException - If an I/O error occurred.

    • close

      public void close() throws IOException
      Closes the ValueStore, releasing any file references, etc. Once closed, the ValueStore can no longer be used.
      Throws:
      IOException - If an I/O error occurred.

    • checkConsistency

      public void checkConsistency() throws SailException, IOException
      Checks that every value has exactly one ID.
      Throws:
      IOException
      SailException

    • createIRI

      public NativeIRI createIRI(String uri)
      Description copied from interface: ValueFactory
      Creates a new IRI from the supplied string-representation.
      Specified by:
      createIRI in interface ValueFactory
      Overrides:
      createIRI in class SimpleValueFactory
      Parameters:
      uri - A string-representation of a IRI.
      Returns:
      An object representing the IRI.

    • createIRI

      public NativeIRI createIRI(String namespace, String localName)
      Description copied from interface: ValueFactory
      Creates a new IRI from the supplied namespace and local name. Calling this method is funtionally equivalent to calling createIRI(namespace+localName), but allows the ValueFactory to reuse supplied namespace and local name strings whenever possible. Note that the values returned by IRI.getNamespace() and IRI.getLocalName() are not necessarily the same as the values that are supplied to this method.
      Specified by:
      createIRI in interface ValueFactory
      Overrides:
      createIRI in class SimpleValueFactory
      Parameters:
      namespace - The IRI's namespace.
      localName - The IRI's local name.

    • createBNode

      public NativeBNode createBNode(String nodeID)
      Description copied from interface: ValueFactory
      Creates a new blank node with the given node identifier.
      Specified by:
      createBNode in interface ValueFactory
      Overrides:
      createBNode in class SimpleValueFactory
      Parameters:
      nodeID - The blank node identifier.
      Returns:
      An object representing the blank node.

    • createLiteral

      public NativeLiteral createLiteral(String value)
      Description copied from interface: ValueFactory
      Creates a new literal with the supplied label. The return value of Literal.getDatatype() for the returned object must be xsd:string.
      Specified by:
      createLiteral in interface ValueFactory
      Overrides:
      createLiteral in class SimpleValueFactory
      Parameters:
      value - The literal's label, must not be null.
      Returns:
      A literal for the specified value.

    • createLiteral

      public NativeLiteral createLiteral(String value, String language)
      Description copied from interface: ValueFactory
      Creates a new literal with the supplied label and language attribute. The return value of Literal.getDatatype() for the returned object must be rdf:langString.
      Specified by:
      createLiteral in interface ValueFactory
      Overrides:
      createLiteral in class SimpleValueFactory
      Parameters:
      value - The literal's label, must not be null.
      language - The literal's language attribute, must not be null.
      Returns:
      A literal for the specified value and language attribute.

    • createLiteral

      public NativeLiteral createLiteral(String value, IRI datatype)
      Description copied from interface: ValueFactory
      Creates a new literal with the supplied label and datatype.
      Specified by:
      createLiteral in interface ValueFactory
      Overrides:
      createLiteral in class SimpleValueFactory
      Parameters:
      value - The literal's label, must not be null.
      datatype - The literal's datatype. If it is null, the datatype xsd:string will be assigned to this literal.
      Returns:
      A literal for the specified value and type.

    • getNativeValue

      public NativeValue getNativeValue(Value value)

    • getNativeResource

      public NativeResource getNativeResource(Resource resource)

    • getNativeURI

      public NativeIRI getNativeURI(IRI uri)
      Creates a NativeURI that is equal to the supplied URI. This method returns the supplied URI itself if it is already a NativeURI that has been created by this ValueStore, which prevents unnecessary object creations.
      Returns:
      A NativeURI for the specified URI.

    • getNativeBNode

      public NativeBNode getNativeBNode(BNode bnode)
      Creates a NativeBNode that is equal to the supplied bnode. This method returns the supplied bnode itself if it is already a NativeBNode that has been created by this ValueStore, which prevents unnecessary object creations.
      Returns:
      A NativeBNode for the specified bnode.

    • getNativeLiteral

      public NativeLiteral getNativeLiteral(Literal l)
      Creates an NativeLiteral that is equal to the supplied literal. This method returns the supplied literal itself if it is already a NativeLiteral that has been created by this ValueStore, which prevents unnecessary object creations.
      Returns:
      A NativeLiteral for the specified literal.

    • main

      public static void main(String[] args) throws Exception
      Throws:
      Exception