Class ModelGraphImpl

java.lang.Object
org.apache.commons.rdf.rdf4j.impl.ModelGraphImpl
All Implemented Interfaces:
AutoCloseable, Graph, GraphLike<Triple>, RDF4JGraph, RDF4JGraphLike<Triple>
final class ModelGraphImpl extends Object implements RDF4JGraph

  • Field Details

    • model

      private final org.eclipse.rdf4j.model.Model model

    • rdf4jTermFactory

      private final RDF4J rdf4jTermFactory

  • Constructor Details

    • ModelGraphImpl

      ModelGraphImpl(org.eclipse.rdf4j.model.Model model, RDF4J rdf4jTermFactory)

  • Method Details

    • add

      public void add(BlankNodeOrIRI subject, IRI predicate, RDFTerm object)
      Description copied from interface: Graph
      Adds a triple to the graph, possibly mapping any of the components to those supported by this Graph.
      Specified by:
      add in interface Graph
      Parameters:
      subject - The triple subject
      predicate - The triple predicate
      object - The triple object

    • add

      public void add(Triple triple)
      Description copied from interface: Graph
      Adds a triple to the graph, possibly mapping any of the components of the Triple to those supported by this Graph.
      Specified by:
      add in interface Graph
      Specified by:
      add in interface GraphLike<Triple>
      Parameters:
      triple - The triple to add

    • asModel

      public Optional<org.eclipse.rdf4j.model.Model> asModel()
      Description copied from interface: RDF4JGraphLike
      Return the corresponding RDF4J Model, if present.

      The return value is Optional.isPresent() if this is backed by a Model.

      Changes to the Model are reflected in both directions.

      Specified by:
      asModel in interface RDF4JGraphLike<Triple>
      Returns:
      The corresponding RDF4J Model.

    • asRepository

      public Optional<org.eclipse.rdf4j.repository.Repository> asRepository()
      Description copied from interface: RDF4JGraphLike
      Return the corresponding RDF4J Repository, if present.

      The return value is Optional.isPresent() if this is backed by a Repository.

      Changes to the Repository are reflected in both directions.

      Specified by:
      asRepository in interface RDF4JGraphLike<Triple>
      Returns:
      The corresponding RDF4J Repository.

    • clear

      public void clear()
      Description copied from interface: Graph
      Clears the graph, removing all triples.
      Specified by:
      clear in interface Graph
      Specified by:
      clear in interface GraphLike<Triple>

    • contains

      public boolean contains(BlankNodeOrIRI subject, IRI predicate, RDFTerm object)
      Description copied from interface: Graph
      Checks if graph contains a pattern of triples.
      Specified by:
      contains in interface Graph
      Parameters:
      subject - The triple subject (null is a wildcard)
      predicate - The triple predicate (null is a wildcard)
      object - The triple object (null is a wildcard)
      Returns:
      True if the Graph contains any Triples that match the given pattern.

    • contains

      public boolean contains(Triple triple)
      Description copied from interface: Graph
      Checks if graph contains triple.
      Specified by:
      contains in interface Graph
      Specified by:
      contains in interface GraphLike<Triple>
      Parameters:
      triple - The triple to check.
      Returns:
      True if the Graph contains the given Triple.

    • remove

      public void remove(BlankNodeOrIRI subject, IRI predicate, RDFTerm object)
      Description copied from interface: Graph
      Removes a concrete pattern of triples from the graph.
      Specified by:
      remove in interface Graph
      Parameters:
      subject - The triple subject (null is a wildcard)
      predicate - The triple predicate (null is a wildcard)
      object - The triple object (null is a wildcard)

    • remove

      public void remove(Triple triple)
      Description copied from interface: Graph
      Removes a concrete triple from the graph.
      Specified by:
      remove in interface Graph
      Specified by:
      remove in interface GraphLike<Triple>
      Parameters:
      triple - triple to remove

    • size

      public long size()
      Description copied from interface: Graph
      Number of triples contained by the graph.

      The count of a set does not include duplicates, consistent with the Triple.equals(Object) equals method for each Triple.

      Specified by:
      size in interface Graph
      Specified by:
      size in interface GraphLike<Triple>
      Returns:
      The number of triples in the graph

    • stream

      public Stream<RDF4JTriple> stream()
      Description copied from interface: RDF4JGraph
      Gets all triples contained by the graph.

      The iteration does not contain any duplicate triples, as determined by the Triple.equals(Object) method for each Triple.

      The behaviour of the Stream is not specified if Graph.add(Triple), Graph.remove(Triple) or Graph.clear() are called on the Graph before it terminates.

      Implementations may throw ConcurrentModificationException from Stream methods if they detect a conflict while the Stream is active.

      Note that for graphs backed by a repository (RDF4JGraphLike.asRepository() is present), the stream must be closed with BaseStream.close().

      This can generally achieved using a try-with-resources block, e.g.: 

      int subjects;
try (Stream<RDF4JTriple> s : graph.stream()) {
  subjects = s.map(RDF4JTriple::getSubject).distinct().count()
}
      Specified by:
      stream in interface Graph
      Specified by:
      stream in interface GraphLike<Triple>
      Specified by:
      stream in interface RDF4JGraph
      Returns:
      A Stream over all of the triples in the graph

    • stream

      public Stream<RDF4JTriple> stream(BlankNodeOrIRI subject, IRI predicate, RDFTerm object)
      Description copied from interface: RDF4JGraph
      Gets all triples contained by the graph matched with the pattern.

      The iteration does not contain any duplicate triples, as determined by the Triple.equals(Object) method for each Triple.

      The behaviour of the Stream is not specified if Graph.add(Triple), Graph.remove(Triple) or Graph.clear() are called on the Graph before it terminates.

      Implementations may throw ConcurrentModificationException from Stream methods if they detect a conflict while the Stream is active.

      Note that for graphs backed by a repository (RDF4JGraphLike.asRepository() is present), the stream must be closed with BaseStream.close().

      This can generally achieved using a try-with-resources block, e.g.: 

      int subjects;
try (Stream<RDF4JTriple> s : graph.stream(s,p,o)) {
  subjects = s.map(RDF4JTriple::getSubject).distinct().count()
}
      Specified by:
      stream in interface Graph
      Specified by:
      stream in interface RDF4JGraph
      Parameters:
      subject - The triple subject (null is a wildcard)
      predicate - The triple predicate (null is a wildcard)
      object - The triple object (null is a wildcard)
      Returns:
      A Stream over the matched triples.

    • getContextMask

      public Set<RDF4JBlankNodeOrIRI> getContextMask()
      Description copied from interface: RDF4JGraph
      Return a copy of the context mask as a Set of RDF4JBlankNodeOrIRI graph names.

      If the set is not Set.isEmpty(), the mask determines which contexts in the corresponding RDF4J Model or Repository that this graph reflect. Modifications to the graph (e.g. Graph.add(Triple) will be performed for all the specified contexts, while retrieval (e.g. Graph.contains(Triple)) will succeed if the triple is in at least one of the specified contexts.

      The context mask array may contain null, indicating the default context (the default graph in RDF datasets).

      If the context mask is Set.isEmpty(), then this is a union graph which triples reflect statements in any contexts. Triples added to the graph will be added in the default context, e.g. equivalent to new Resource[1]{null}) in RDF4J.

      Note that the context mask itself cannot be null.

      The returned set is an immutable copy; to specify a different mask, use RDF4J.asGraph(Repository, Set, Option...)

      Specified by:
      getContextMask in interface RDF4JGraph
      Returns:
      The context mask as a set of BlankNodeOrIRI graph names, which may contain the value null.

    • iterate

      public ClosableIterable<Triple> iterate(BlankNodeOrIRI subject, IRI predicate, RDFTerm object)
      Description copied from interface: RDF4JGraph
      Gets an Iterable for iterating over the triples in the graph that match the pattern.

      This method is meant to be used with a Java for-each loop, e.g.: 

      IRI alice = factory.createIRI("http://example.com/alice");
IRI knows = factory.createIRI("http://xmlns.com/foaf/0.1/");
for (Triple t : graph.iterate(alice, knows, null)) {
    System.out.println(t.getObject());
}

      The behaviour of the iterator is not specified if Graph.add(Triple), Graph.remove(Triple) or Graph.clear(), are called on the Graph before it terminates. It is undefined if the returned Iterator supports the Iterator.remove() method.

      Implementations may throw ConcurrentModificationException from Iterator methods if they detect a concurrency conflict while the Iterator is active.

      The Iterable.iterator() must only be called once, that is the Iterable must only be iterated over once. A IllegalStateException may be thrown on attempt to reuse the Iterable.

      The default implementation of this method will call Graph.stream(BlankNodeOrIRI, IRI, RDFTerm) to return its BaseStream.iterator().

      Note that for graphs backed by a repository (RDF4JGraphLike.asRepository() is present), the iterable must be closed with AutoCloseable.close().

      This can generally achieved using a try-with-resources block, e.g.: 

      try (ClosableIterable<Triple> s : graph.iterate(s,p,o)) {
  for (Triple t : triples) {
      return t; // OK to terminate for-loop early
  }
}
      If you don't use a try-with-resources block, the iterator will attempt to close the ClosableIterable when reaching the end of the iteration.
      Specified by:
      iterate in interface Graph
      Specified by:
      iterate in interface RDF4JGraph
      Parameters:
      subject - The triple subject (null is a wildcard)
      predicate - The triple predicate (null is a wildcard)
      object - The triple object (null is a wildcard)
      Returns:
      A Iterable that returns Iterator over the matching triples in the graph

    • iterate

      public ClosableIterable<Triple> iterate() throws ConcurrentModificationException, IllegalStateException
      Description copied from interface: RDF4JGraph
      Gets an Iterable for iterating over all triples in the graph.

      This method is meant to be used with a Java for-each loop, e.g.: 

      for (Triple t : graph.iterate()) {
    System.out.println(t);
}
      The behaviour of the iterator is not specified if Graph.add(Triple), Graph.remove(Triple) or Graph.clear(), are called on the Graph before it terminates. It is undefined if the returned Iterator supports the Iterator.remove() method.

      Implementations may throw ConcurrentModificationException from Iterator methods if they detect a concurrency conflict while the Iterator is active.

      The Iterable.iterator() must only be called once, that is the Iterable must only be iterated over once. A IllegalStateException may be thrown on attempt to reuse the Iterable.

      The default implementation of this method will call Graph.stream() to return its BaseStream.iterator().

      Note that for graphs backed by a repository (RDF4JGraphLike.asRepository() is present), the iterable must be closed with AutoCloseable.close().

      This can generally achieved using a try-with-resources block, e.g.: 

      try (ClosableIterable<Triple> s : graph.iterate()) {
  for (Triple t : triples) {
      return t; // OK to terminate for-loop early
  }
}
      If you don't use a try-with-resources block, the iterator will attempt to close the ClosableIterable when reaching the end of the iteration.
      Specified by:
      iterate in interface Graph
      Specified by:
      iterate in interface GraphLike<Triple>
      Specified by:
      iterate in interface RDF4JGraph
      Returns:
      A Iterable that returns Iterator over all of the triples in the graph
      Throws:
      ConcurrentModificationException - if a concurrency conflict occurs while the Iterator is active.
      IllegalStateException - if the Iterable has been reused