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


    InputStream getResourceAsStream(final ClassLoader cl,
                                           final String name)
    {
        return (InputStream)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    InputStream ris;
                    if (cl == null) {
                        ris = ClassLoader.getSystemResourceAsStream(name);
                    } else {

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            });
    }
    
    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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     * standard profiles.
     */
    private static ICC_Profile getStandardProfile(final String name) {
        
  return (ICC_Profile) AccessController.doPrivileged(
      new PrivilegedAction() {
                 public Object run() {
                     ICC_Profile p = null;
                     try {
                         p = getInstance (name);
                     } catch (IOException ex) {

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    final void initDispatchThread() { 
        synchronized (this) {
            if (dispatchThread == null && !threadGroup.isDestroyed()) {
                dispatchThread = (EventDispatchThread)
                    AccessController.doPrivileged(new PrivilegedAction() {
                        public Object run() {
                            EventDispatchThread t = 
                                new EventDispatchThread(threadGroup, 
                                                        name, 
                                                        EventQueue.this);

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       to the regular finalizer thread and waiting for that thread to finish.
       The advantage of creating a fresh thread, however, is that it insulates
       invokers of these methods from a stalled or deadlocked finalizer thread.
     */
    private static void forkSecondaryFinalizer(final Runnable proc) {
  PrivilegedAction pa = new PrivilegedAction() {
      public Object run() {
    ThreadGroup tg = Thread.currentThread().getThreadGroup();
    for (ThreadGroup tgn = tg;
         tgn != null;
         tg = tgn, tgn = tg.getParent());

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       threat as accessible flag is set only for this Constructor object, 
       not for Class constructor.
     */
    private static Constructor getCtor(final Class clazz)
    {
        Object ctor = AccessController.doPrivileged(new PrivilegedAction() {
            public Object run() {
                try {
                    Constructor ctor = clazz.getDeclaredConstructor((Class[]) null);
                    if (ctor != null) {
                        ctor.setAccessible(true);

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     *         preference tree, <tt>false</tt> if it's in the system
     *         preference tree.
     */
    public boolean isUserNode() {
        Boolean result = (Boolean)
          AccessController.doPrivileged( new PrivilegedAction() {            
            public Object run() {
                return new Boolean(root == Preferences.userRoot());
            }
        });
        return result.booleanValue();

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    // To be able to query system properties as soon as they're available
    private static boolean initted = false;
    private static void checkInitted() {
        if (initted) return;
        AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    // Tests to ensure the system properties table is fully
                    // initialized. This is needed because reflection code is
                    // called very early in the initialization process (before
                    // command-line arguments have been parsed and therefore

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 */
class SecuritySupport12 extends SecuritySupport {


    ClassLoader getContextClassLoader() {
        return (ClassLoader)
                AccessController.doPrivileged(new PrivilegedAction() {
            public Object run() {
                ClassLoader cl = null;
                try {
                    cl = Thread.currentThread().getContextClassLoader();
                } catch (SecurityException ex) { }

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