/** {@inheritDoc} */
  public boolean canViewAllPurposeItem(Assignment a) {
    boolean rv = false;

    if (a != null) {
      AssignmentAllPurposeItem aItem = getAllPurposeItem(a.getId());
      if (aItem != null) {
        if (!aItem.getHide()) {
          Time now = TimeService.newTime();
          Date releaseDate = aItem.getReleaseDate();
          Date retractDate = aItem.getRetractDate();

          if (releaseDate == null && retractDate == null) {
            // no time limitation on showing the item
            rv = true;
          } else if (releaseDate != null && retractDate == null) {
            // has relase date but not retract date
            rv = now.getTime() > releaseDate.getTime();
          } else if (releaseDate == null && retractDate != null) {
            // has retract date but not release date
            rv = now.getTime() < retractDate.getTime();
          } else if (now != null) {
            // both releaseDate and retract date are not null
            // has both release and retract dates
            rv = now.getTime() > releaseDate.getTime() && now.getTime() < retractDate.getTime();
          }
        } else {
          rv = false;
        }
      }

      if (rv) {
        // reset rv
        rv = false;

        // need to check role/user permission only if the above time test returns true
        List<String> access = getAccessListForAllPurposeItem(aItem);
        User u = m_userDirectoryService.getCurrentUser();
        if (u != null) {
          if (access.contains(u.getId())) rv = true;
          else {
            try {
              String role =
                  m_authzGroupService.getUserRole(
                      u.getId(), m_siteService.siteReference(a.getContext()));
              if (access.contains(role)) rv = true;
            } catch (Exception e) {
              Log.warn(
                  this
                      + ".callViewAllPurposeItem() Hibernate cannot access user role for user id= "
                      + u.getId());
              return rv;
            }
          }
        }
      }
    }

    return rv;
  }
 private String getSiteReference(String siteContext) {
   final Reference ref = entityManager.newReference(siteService.siteReference(siteContext));
   return ref.getReference();
 }
  public static java.lang.String siteReference(java.lang.String param0) {
    org.sakaiproject.site.api.SiteService service = getInstance();
    if (service == null) return null;

    return service.siteReference(param0);
  }