Examples -> this

Concrete Class Example

This example show how the annotations work on a concrete class. Note that the entity manger creates an instance of the class. This class is the similar to the concrete class extending annotated interface example except that it directly annotates the methods.

Book Class

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

    public public void setTitle( String title)
    {
       throw new EntityManagerRequiredException();
    }

    @Override
    @Predicate( impl = true )
    public String getTitle()
    {
       throw new EntityManagerRequiredException();
    }

    @Override
    @Predicate( impl = true )
    public void addAuthor( String author )
    {
       throw new EntityManagerRequiredException();
    }

    @Override
    @Predicate( impl = true, type=String.class )
    public List<String> getAuthor() {
       throw new EntityManagerRequiredException();
    }

    @Override
    @Predicate( impl = true )
    public void setPageCount( Integer int )
    {
       throw new EntityManagerRequiredException();
    }

    @Override
    @Predicate( impl = true )  
    public boolean hasPageCount()
    {
       throw new EntityManagerRequiredException();
    }

    @Override
    @Predicate( impl = true )   
    public int getPageCount()
    {
       throw new EntityManagerRequiredException();
    }

    public String cite() {
      StringBuilder sb = new StringBuilder();
      for (String author : getAuthor() )
      {
        sb.append( author ).append( ", " );
      }
      sb.append( getTitle() ).append( "." );
      if (book.hasPageCount())
      {
        sb.append(" pgs: ").append( getPageCount() );
      }
      return sb.toString();
    }
}

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() );
}
System.out.println( book.cite() );

This will result in the following output:

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