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Interface Example

This example show how the annotations work on an interface. Note that the entity manger creates an instance of the interface and no direct coding for the Book interface is ever done.

Book Interface

@Subject( namespace="http://example.com/PA4RDF#" )
public interface Book {

    @Predicate
    void setTitle( String title );
    String getTitle();

    @Predicate
    void addAuthor( String author );
    ExtendedIterator<String> getAuthor();

    @Predicate
    void setPageCount( Integer int );
    boolean hasPageCount();
    int getPageCount();
}

Example code setting the Book class

Model model = ModelFactory.createModel();

EntityManager entityManager = EntityManagerFactory.getEntityManager(model);
Resource r = model.createResource( "http://example.com/mylibrary/book1" );


Book book = EntityManager.read( r, Book.class );
book.setTitle( "Java Generics and Collections" );
book.addAuthor( "Maurice Naftalin" );
book.addAuthor( "Philip Wadler" );
book.setPageCount( 286 );

Result of example code

The above code will result in the following graph:

<http://example.com/mylibrary/book1> 
    <http://example.com/PA4RDF#title> "Java Generics and Collections" ;
    <http://example.com/PA4RDF#author> "Maurice Naftalin" ;
    <http://example.com/PA4RDF#author> "Philip Wadler" ;
    <http://example.com/PA4RDF#pageCount> "286"^^<xsd:integer> ;
.

Example code reading the Book class

Assuming the book object has been constructed as in the first example.

System.out.println( "Title: "+book.getTitle() );
Iterator<String> authors = book.getAuthors();
while (authors.hasNext())
{
    System.out.println( "  Author: "+authors.next() );
}
if (book.hasPageCount())
{
    System.out.println( "  Pages: "+book.getPageCount() );
}

This will result in the following output:

Title: Java Generics and Collections
  Author: Maurice Naftalin
  Author: Philip Wadler
  Pages: 286