RoleFacade.java

package fi.insomnia.bortal.facade;

import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;

import fi.insomnia.bortal.enums.BeanRole;
import fi.insomnia.bortal.model.Event;
import fi.insomnia.bortal.model.Role;

@Stateless
@LocalBean
public class RoleFacade extends EventChildGenericFacade<Role> {

    private static final String PUBLIC_ROLE_NAME = BeanRole.ANONYMOUS.toString();
    @PersistenceContext
    private EntityManager em;

    public RoleFacade() {
        super(Role.class);
    }

    protected EntityManager getEm() {
        return em;
    }
    
    public Role findByName(String name) {
        TypedQuery<Role> q = em.createNamedQuery("Role.findByRoleName", Role.class);
        q.setParameter("name", name);
        return this.getSingleNullableResult(q);
    }

    public Role getOrCreatePublicRole(Event event) {
        Role publicRole = findByName(PUBLIC_ROLE_NAME);

        if (publicRole == null) {
            publicRole = createPublicRole(event);
        }

        return publicRole;
    }

    private Role createPublicRole(Event event) {
        Role publicRole = new Role(event);
        publicRole.setName(PUBLIC_ROLE_NAME);
        em.persist(publicRole);
        return publicRole;
    }
}