privilegedexceptionaction.java

来自「This is a resource based on j2me embedde」· Java 代码 · 共 65 行

/*
 * @(#)PrivilegedExceptionAction.java	1.12 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.  
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
 *   
 * This program is free software; you can redistribute it and/or  
 * modify it under the terms of the GNU General Public License version  
 * 2 only, as published by the Free Software Foundation.   
 *   
 * This program is distributed in the hope that it will be useful, but  
 * WITHOUT ANY WARRANTY; without even the implied warranty of  
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
 * General Public License version 2 for more details (a copy is  
 * included at /legal/license.txt).   
 *   
 * You should have received a copy of the GNU General Public License  
 * version 2 along with this work; if not, write to the Free Software  
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
 * 02110-1301 USA   
 *   
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
 * Clara, CA 95054 or visit www.sun.com if you need additional  
 * information or have any questions. 
 *
 */

package java.security;


/**
 * A computation to be performed with privileges enabled, that throws one or
 * more checked exceptions.  The computation is performed by invoking
 * <code>AccessController.doPrivileged</code> on the
 * <code>PrivilegedExceptionAction</code> object.  This interface is
 * used only for computations that throw checked exceptions;
 * computations that do not throw
 * checked exceptions should use <code>PrivilegedAction</code> instead.
 *
 * @see AccessController
 * @see AccessController#doPrivileged(PrivilegedExceptionAction)
 * @see AccessController#doPrivileged(PrivilegedExceptionAction,
 *                                              AccessControlContext)
 * @see PrivilegedAction
 */

public interface PrivilegedExceptionAction {
    /**
     * Performs the computation.  This method will be called by
     * <code>AccessController.doPrivileged</code> after enabling privileges.
     *
     * @return a class-dependent value that may represent the results of the
     *	       computation.  Each class that implements
     *	       <code>PrivilegedExceptionAction</code> should document what
     *         (if anything) this value represents.
     * @throws Exception an exceptional condition has occurred.  Each class
     *	       that implements <code>PrivilegedExceptionAction</code> should
     *         document the exceptions that its run method can throw.
     * @see AccessController#doPrivileged(PrivilegedExceptionAction)
     * @see AccessController#doPrivileged(PrivilegedExceptionAction,AccessControlContext)
     */

    Object run() throws Exception;
}