public class State
{
	public static final State FIVE_STATE = new State(5, "five state");
	
	public static final State ONE_STATE = new State(1, "one state");
	
	private int id;
	
	private String name;
	
	private State(int id, String name)
	{
		this.id = id;
		this.name = name;
		
	}
}

@Entity
@Table(name="photo")
public class Photo
{
	@Id
	private int id;
	
	private State state;
}

public class PhotoDesc extends ClassDescriptor
{
	public PhotoDesc()
	{
		{...}
		
		DirectToFieldMapping d2f = new DirectToFieldMapping();
		d2f.setAttributeName("state");
		d2f.setFieldName("stateField");
		ObjectTypeConverter objectTypeConverter = new ObjectTypeConverter();
		
		objectTypeConverter.addConversionValue(State.FIVE_STATE.getId(), State.FIVE_STATE);
		objectTypeConverter.addConversionValue(State.ONE_STATE .getId(), State.ONE_STATE);
		
		d2f.setConverter(objectTypeConverter);
		
		{...}
	}
}