Examples of java.security.AccessControlContext

java.security.AccessControlContext
An AccessControlContext is used to make system resource access decisions based on the context it encapsulates.
More specifically, it encapsulates a context and has a single method, checkPermission, that is equivalent to the checkPermission method in the AccessController class, with one difference: The AccessControlContext checkPermission method makes access decisions based on the context it encapsulates, rather than that of the current execution thread.
Thus, the purpose of AccessControlContext is for those situations where a security check that should be made within a given context actually needs to be done from within a different context (for example, from within a worker thread).
An AccessControlContext is created by calling the AccessController.getContext method. The getContext method takes a "snapshot" of the current calling context, and places it in an AccessControlContext object, which it returns. A sample call is the following:
```
 AccessControlContext acc = AccessController.getContext() 
```
Code within a different context can subsequently call the checkPermission method on the previously-saved AccessControlContext object. A sample call is the following:
```
 acc.checkPermission(permission) 
```
@see AccessController @author Roland Schemers

                    return true;
                }
                return false;
            }
        };
        return new AccessControlContext(new ProtectionDomain[] { domain });
    }

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    }




    protected AccessControlContext getAccessControlContext( final Object ref )
    {
        return new AccessControlContext( new ProtectionDomain[]
            { ref.getClass().getProtectionDomain() } );
    }

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         }
      }


      try
      {
         AccessControlContext subjectContext = getSubjectContext(subject, context);
         return Subject.doAsPrivileged(subject, action, subjectContext);
      }
      catch (PrivilegedActionException x)
      {
         throw x.getException();

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         return (AccessControlContext)AccessController.doPrivileged(new PrivilegedAction()
         {
            public Object run()
            {
               InjectingDomainCombiner combiner = new InjectingDomainCombiner(subject);
               AccessControlContext acc = new AccessControlContext(context, combiner);
               AccessController.doPrivileged(new PrivilegedAction()
               {
                  public Object run()
                  {
                     // Check this permission, that is required anyway, to combine the domains
                     sm.checkPermission(new AuthPermission("doAsPrivileged"));
                     return null;
                  }
               }, acc);
               ProtectionDomain[] combined = combiner.getCombinedDomains();
               return new AccessControlContext(combined);
            }
         });
      }
   }

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        super.doEdit(request, response);
    }


    private Subject getSubject()
    {
        AccessControlContext context = AccessController.getContext();
        return JSSubject.getSubject(context);         
    }

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public class SecurityHelper {
    
    private static Logger logger = Logger.getLogger(SecurityHelper.class.getName());
    
    private static X500PrivateCredential getPrivateCredentials() {
        AccessControlContext ctx = AccessController.getContext();
        
        if (ctx == null) {
            return null;
        }
        Subject subject = Subject.getSubject(ctx);

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   * Return the current user, including any doAs in the current stack.
   * @return the current user
   * @throws IOException if login fails
   */
  public static UserGroupInformation getCurrentUser() throws IOException {
    AccessControlContext context = AccessController.getContext();
    Subject subject = Subject.getSubject(context);
    return subject == null ? getLoginUser() : new UserGroupInformation(subject);
  }

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    static final Logger logger = LoggerFactory.getLogger(SSOPortletUtil.class);
    
    public static Subject getSubject()
    {
        AccessControlContext context = AccessController.getContext();
        return JSSubject.getSubject(context);         
    }

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    /*
     * Helper methods
     */
    private Subject getSubject()
    {
        AccessControlContext context = AccessController.getContext();
        return JSSubject.getSubject(context);         
    }

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   */
  @InterfaceAudience.Public
  @InterfaceStability.Evolving
  public synchronized
  static UserGroupInformation getCurrentUser() throws IOException {
    AccessControlContext context = AccessController.getContext();
    Subject subject = Subject.getSubject(context);
    if (subject == null || subject.getPrincipals(User.class).isEmpty()) {
      return getLoginUser();
    } else {
      return new UserGroupInformation(subject);

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