Examples of com.hp.hpl.jena.rdf.model.Literal

com.hp.hpl.jena.rdf.model.Literal
An RDF Literal.
In RDF2003 literals can be typed. If typed then the literal comprises a datatype, a lexical form and a value (together with an optional xml:lang string). Old style literals have no type and are termed "plain" literals.

Implementations of this interface should be able to support both plain and typed literals. In the case of typed literals the primitive accessor methods such as getInt() determine if the literal value can be coerced to an appropriate java wrapper class. If so then the class is unwrapped to extract the primitive value returned. If the coercion fails then a runtime DatatypeFormatException is thrown.

In the case of plain literals then the primitve accessor methods duplicate the behvaiour of jena1. The literal is internally stored in lexical form but the accessor methods such as getInt will attempt to parse the lexical form and if successful will return the primitive value.

Object (i.e. non-primitive) values are supported. In the case of typed literals then a global TypeMapper registry determines what datatype representation to use for a given Object type. In the case of plain literals then the object will be stored in the lexical form given by its toString method. Factory objects, provided by the application, are needed in that case to covert the lexical form back into the appropriate object type.

  @Test
  public void typedLiterals() {
    MGraph mGraph = new SimpleMGraph();
    com.hp.hpl.jena.graph.Graph graph = new JenaGraph(mGraph);
    Model model = ModelFactory.createModelForGraph(graph);
    Literal typedLiteral = model.createTypedLiteral("<elem>foo</elem>", XMLLiteralType.theXMLLiteralType);
    model.add(RDFS.Class, RDFS.label, typedLiteral);
    Assert.assertEquals(1, mGraph.size());
    StmtIterator iter = model.listStatements(RDFS.Class, RDFS.label, (Resource)null);
    Assert.assertTrue(iter.hasNext());
    RDFNode gotObject = iter.nextStatement().getObject();

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    super.tearDown();
  }


  public void testAddContainLiteralByStatement()
  {
    final Literal L = model.createTypedLiteral(210);
    final Statement s = model.createStatement(S, RDF.value, L);
    Assert.assertTrue(model.add(s).contains(s));
    Assert.assertTrue(model.contains(S, RDF.value));
  }

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    Assert.assertFalse(model.createTypedLiteral(false).getBoolean());
  }


  protected void testByte( final Model model, final byte tv )
  {
    final Literal l = model.createTypedLiteral(tv);
    Assert.assertEquals(tv, l.getByte());
    Assert.assertEquals(tv, l.getShort());
    Assert.assertEquals(tv, l.getInt());
    Assert.assertEquals(tv, l.getLong());
  }

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  // // testLiteralObject( model, -67890 );
  // }


  protected void testInt( final Model model, final int tv )
  {
    final Literal l = model.createTypedLiteral(tv);
    try
    {
      Assert.assertEquals(tv, l.getByte());
      assertInRange(Byte.MIN_VALUE, tv, Byte.MAX_VALUE);
    }
    catch (final NumberFormatException e)
    {
      assertOutsideRange(Byte.MIN_VALUE, tv, Byte.MAX_VALUE);
    }
    catch (final IllegalArgumentException e)
    {
      assertOutsideRange(Byte.MIN_VALUE, tv, Byte.MAX_VALUE);
    }
    try
    {
      Assert.assertEquals(tv, l.getShort());
      assertInRange(Short.MIN_VALUE, tv, Short.MAX_VALUE);
    }
    catch (final NumberFormatException e)
    {
      assertOutsideRange(Short.MIN_VALUE, tv, Short.MAX_VALUE);
    }
    catch (final IllegalArgumentException e)
    {
      assertOutsideRange(Short.MIN_VALUE, tv, Short.MAX_VALUE);
    }
    Assert.assertEquals(tv, l.getInt());
    Assert.assertEquals(tv, l.getLong());
  }

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  }


  protected void testLanguagedString( final Model model, final String tv,
      final String lang )
  {
    final Literal l = model.createLiteral(tv, lang);
    Assert.assertEquals(tv, l.getString());
    Assert.assertEquals(tv, l.getLexicalForm());
    Assert.assertEquals(lang, l.getLanguage());
  }

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    testLanguagedString(model, "chat", "fr");
  }


  protected void testLong( final Model model, final long tv )
  {
    final Literal l = model.createTypedLiteral(tv);
    try
    {
      Assert.assertEquals(tv, l.getByte());
      assertInRange(Byte.MIN_VALUE, tv, Byte.MAX_VALUE);
    }
    catch (final NumberFormatException e)
    {
      assertOutsideRange(Byte.MIN_VALUE, tv, Byte.MAX_VALUE);
    }
    catch (final IllegalArgumentException e)
    {
      assertOutsideRange(Byte.MIN_VALUE, tv, Byte.MAX_VALUE);
    }
    try
    {
      Assert.assertEquals(tv, l.getShort());
      assertInRange(Short.MIN_VALUE, tv, Short.MAX_VALUE);
    }
    catch (final NumberFormatException e)
    {
      assertOutsideRange(Short.MIN_VALUE, tv, Short.MAX_VALUE);
    }
    catch (final IllegalArgumentException e)
    {
      assertOutsideRange(Short.MIN_VALUE, tv, Short.MAX_VALUE);
    }
    try
    {
      Assert.assertEquals(tv, l.getInt());
      assertInRange(Integer.MIN_VALUE, tv, Integer.MAX_VALUE);
    }
    catch (final NumberFormatException e)
    {
      assertOutsideRange(Integer.MIN_VALUE, tv, Integer.MAX_VALUE);
    }
    catch (final IllegalArgumentException e)
    {
      assertOutsideRange(Integer.MIN_VALUE, tv, Integer.MAX_VALUE);
    }
    Assert.assertEquals(tv, l.getLong());
  }

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    testLong(model, Long.MAX_VALUE);
  }


  protected void testPlainString( final Model model, final String tv )
  {
    final Literal l = model.createLiteral(tv);
    Assert.assertEquals(tv, l.getString());
    Assert.assertEquals(tv, l.getLexicalForm());
    Assert.assertEquals("", l.getLanguage());
  }

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    testPlainString(model, "Another test string");
  }


  protected void testShort( final Model model, final short tv )
  {
    final Literal l = model.createTypedLiteral(tv);
    try
    {
      Assert.assertEquals(tv, l.getByte());
      assertInRange(Byte.MIN_VALUE, tv, Byte.MAX_VALUE);
    }
    catch (final NumberFormatException e)
    {
      assertOutsideRange(Byte.MIN_VALUE, tv, Byte.MAX_VALUE);
    }
    catch (final IllegalArgumentException e)
    {
      assertOutsideRange(Byte.MIN_VALUE, tv, Byte.MAX_VALUE);
    }
    Assert.assertEquals(tv, l.getShort());
    Assert.assertEquals(tv, l.getInt());
    Assert.assertEquals(tv, l.getLong());
  }

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      object[i] = false;
    }
    iter = model.listObjectsOfProperty(predicate[0]);
    while (iter.hasNext())
    {
      final Literal l = (Literal) iter.nextNode();
      final int i = l.getInt();
      object[i] = true;
    }
    for (int i = 0; i < (num * num); i++)
    {
      if ((i % num) == 0)

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  }


  public void testDefaults()
  {
    final Alt a = model.createAlt();
    final Literal tvLiteral = model.createLiteral("test 12 string 2");
    // Resource tvResObj = model.createResource( new ResTestObjF() );
    final Bag tvBag = model.createBag();
    final Alt tvAlt = model.createAlt();
    final Seq tvSeq = model.createSeq();
    //

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