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

        
        // This is safe because we are already checking for the privilege to restart the JVM
        //  above.  If we get this far then we want the Wrapper to be able to do everything
        //  necessary to stop the JVM.
        AccessController.doPrivileged(
            new PrivilegedAction() {
                public Object run() {
                    privilegedStopInner( 0 );
                    return null;
                }
            }

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        // This is safe because we are already checking for the privilege to stop the JVM
        //  above.  If we get this far then we want the Wrapper to be able to do everything
        //  necessary to stop the JVM.
        AccessController.doPrivileged(
            new PrivilegedAction() {
                public Object run() {
                    privilegedStopInner( exitCode );
                    return null;
                }
            }

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                // This is safe because we are already checking for the privilege to stop the JVM
                //  above.  If we get this far then we want the Wrapper to be able to do everything
                //  necessary to stop the JVM.
                AccessController.doPrivileged(
                    new PrivilegedAction() {
                        public Object run() {
                            privilegedStopInner( exitCode );
                            return null;
                        }
                    }

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            // This is safe because we are already checking for the privilege to stop the JVM
            //  above.  If we get this far then we want the Wrapper to be able to do everything
            //  necessary to stop the JVM.
            AccessController.doPrivileged(
                new PrivilegedAction() {
                    public Object run() {
                        privilegedStopInner( exitCode );
                        return null;
                    }
                }

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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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        });
    }


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

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            });
    }


    ClassLoader getParentClassLoader(final ClassLoader cl) {
        return (ClassLoader)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    ClassLoader parent = null;
                    try {
                        parent = cl.getParent();
                    } catch (SecurityException ex) {}

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            });
    }


    String getSystemProperty(final String propName) {
        return (String)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    return System.getProperty(propName);
                }
            });
    }

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    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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