Examples of java.security.PrivilegedAction

java.security.PrivilegedAction
A computation to be performed with privileges enabled. The computation is performed by invoking AccessController.doPrivileged on the PrivilegedAction object. This interface is used only for computations that do not throw checked exceptions; computations that throw checked exceptions must use PrivilegedExceptionAction instead. @see AccessController @see AccessController#doPrivileged(PrivilegedAction) @see PrivilegedExceptionAction

            });
    }
    
    boolean getFileExists(final File f) {
    return ((Boolean)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    return new Boolean(f.exists());
                }
            })).booleanValue();
    }

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            })).booleanValue();
    }
    
    long getLastModified(final File f) {
    return ((Long)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    return new Long(f.lastModified());
                }
            })).longValue();
    }

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    public URL findResource(final String name) {
  /*
   * The same restriction to finding classes applies to resources
   */
  URL url = 
      (URL) AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    return ucp.findResource(name, true);
                }
            }, acc);

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    if (url != null) {
        return true;
    }
    do {
        URL u = (URL)
      AccessController.doPrivileged(new PrivilegedAction() {
          public Object run() {
        if (!e.hasMoreElements())
                                     return null;
                              return e.nextElement();
          }

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  if (p != null) {
      final SecurityManager sm = System.getSecurityManager();
      if (sm != null) {
    final Permission fp = p;
    AccessController.doPrivileged(new PrivilegedAction() {
        public Object run() throws SecurityException {
      sm.checkPermission(fp);
      return null;
        }
    }, acc);

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               final ClassLoader parent) {
  // Save the caller's context
  AccessControlContext acc = AccessController.getContext();
  // Need a privileged block to create the class loader
  URLClassLoader ucl =
      (URLClassLoader) AccessController.doPrivileged(new PrivilegedAction() {
    public Object run() {
        return new FactoryURLClassLoader(urls, parent);
    }
      });
  // Now set the context on the loader using the one we saved,

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    public static URLClassLoader newInstance(final URL[] urls) {
  // Save the caller's context
  AccessControlContext acc = AccessController.getContext();
  // Need a privileged block to create the class loader
  URLClassLoader ucl = (URLClassLoader)
      AccessController.doPrivileged(new PrivilegedAction() {
    public Object run() {
        return new FactoryURLClassLoader(urls);
    }
      });

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      // trying to initialize the policy (which usually involves
      // accessing some security and/or system properties, which in turn
      // calls the installed security manager's checkPermission method
      // which will loop infinitely if there is a non-system class
      // (in this case: the new security manager class) on the stack).
      AccessController.doPrivileged(new PrivilegedAction() {
    public Object run() {
        s.getClass().getProtectionDomain().implies
      (SecurityConstants.ALL_PERMISSION);
        return null;
    }

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    return result;
      }
  }


  // We have to raise privilege for getDeclaredMethods
  result = (Method[]) AccessController.doPrivileged(new PrivilegedAction() {
    public Object run() {
        return fclz.getDeclaredMethods();
    }
      });

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        iterCache[type] = new SoftReference(cache);
        return result;
    }


    private static ResourceBundle getBundle(final String baseName, final Locale locale) {
         return (ResourceBundle) AccessController.doPrivileged(new PrivilegedAction() {
            public Object run() {
                return ResourceBundle.getBundle(baseName, locale);
            }
        });
    }

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