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.

  {
    // Resource r = model.createResource( "eh:/rhubarb" );
    final UniqueValueClass2 r = new UniqueValueClass2("rhubarb");
    Assert.assertNull("not expecting registered RDF Datatype", TypeMapper
        .getInstance().getTypeByValue(r));
    final Literal typed = model.createTypedLiteral(r); // Sets the type
    // mapper -
    // contaminates it
    // with
    // UniqueValueClass2
    final Literal string = model.createLiteral(r.value);
    Assert.assertEquals(string.getLexicalForm(), typed.getLexicalForm());
    Assert.assertEquals(string.getLanguage(), typed.getLanguage());
    JenaTestBase.assertDiffer(string.getDatatypeURI(),
        typed.getDatatypeURI());
    Assert.assertNotNull(
        "a datatype should have been invented for Resource[Impl]",
        typed.getDatatype());
    JenaTestBase.assertDiffer(typed, string);
    JenaTestBase.assertDiffer(typed.getValue(), string.getValue());
    Assert.assertEquals(r, typed.getValue());
    JenaTestBase.assertDiffer(typed.hashCode(), string.hashCode());
  }

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  }


  public void testRDFNodeAsLiteral()
  {
    final Model m = ModelHelper.modelWithStatements(this, "");
    final Literal l = m.createLiteral("hello, world");
    Assert.assertSame(l, ((RDFNode) l).asLiteral());
  }

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  }


  public void testResourceAsLiteralThrows()
  {
    final Model m = ModelHelper.modelWithStatements(this, "");
    final Literal l = m.createLiteral("hello, world");
    try
    {
      l.asResource();
      Assert.fail("should not be able to do Literal.asResource()");
    }
    catch (final ResourceRequiredException e)
    {
    }

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  private static String _getValueAsString(RDFNode node) {
    if ( node == null ) {
      return null;
    }
    else if ( node instanceof Literal ) {
      Literal lit = (Literal) node;
      return lit.getLexicalForm();
    } 
    else {
      return ((Resource) node).getURI();
    }
  }

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  }


  public void testAddLiteralPassesLiteralUnmodified()
  {
    final Resource r = model.createResource();
    final Literal lit = model.createLiteral("spoo");
    r.addLiteral(RDF.value, lit);
    Assert.assertTrue("model should contain unmodified literal",
        model.contains(null, RDF.value, lit));
  }

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  public void testFillingContainer()
  {
    final Container c = createContainer();
    final String lang = "fr";
    final Literal tvLiteral = model.createLiteral("test 12 string 2");
    // Resource tvResObj = model.createResource( new ResTestObjF() );
    c.add(AbstractModelTestBase.tvBoolean);
    Assert.assertTrue(c.contains(AbstractModelTestBase.tvBoolean));
    c.add(AbstractModelTestBase.tvByte);
    Assert.assertTrue(c.contains(AbstractModelTestBase.tvByte));

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  @Override
  public void setUp() throws Exception
  {
    super.setUp();
    final Literal tvLitObjs[] = {
        model.createTypedLiteral(new LitTestObj(1)),
        model.createTypedLiteral(new LitTestObj(2)) };


    for (int i = 0; i < num; i += 1)
    {

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     * the _null_ argument to LiteralImpl was preserved only for backward
     * compatability. It was be logged and has now become an exception.
     */
    try
    {
      final Literal lit = model.createLiteral(null, "");
      model.query(new SimpleSelector(null, null, lit));
      Assert.fail("SHould have thrown a null pointer exception");
    }
    catch (final NullPointerException expected)
    { // expected}
    }


    try
    {
      final Literal lit = model.createLiteral(null, "en");
      model.query(new SimpleSelector(null, null, lit));
      Assert.fail("SHould have thrown a null pointer exception");
    }
    catch (final NullPointerException expected)
    { // expected}

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  }


  public void testSeqAccessByIndexing()
  {
    // LitTestObj tvObject = new LitTestObj(12345);
    final Literal tvLiteral = model.createLiteral("test 12 string 2");
    final Resource tvResource = model.createResource();
    // Resource tvResObj = model.createResource(new ResTestObjF());
    final Object tvLitObj = new LitTestObj(1234);
    final Bag tvBag = model.createBag();
    final Alt tvAlt = model.createAlt();

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  }


  public void testSeqInsertByIndexing()
  {
    // LitTestObj tvObject = new LitTestObj(12345);
    final Literal tvLiteral = model.createLiteral("test 12 string 2");
    final Resource tvResource = model.createResource();
    // Resource tvResObj = model.createResource(new ResTestObjF());
    final Object tvLitObj = new LitTestObj(1234);
    final Bag tvBag = model.createBag();
    final Alt tvAlt = model.createAlt();

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