author | weijun |
Tue, 14 Aug 2018 22:39:34 +0800 | |
changeset 51398 | 3c389a284345 |
parent 47216 | 71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.security.action; |
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import java.security.AccessController; |
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/** |
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* A convenience class for retrieving the boolean value of a system property |
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* as a privileged action. |
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* |
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* <p>An instance of this class can be used as the argument of |
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* <code>AccessController.doPrivileged</code>. |
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* |
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* <p>The following code retrieves the boolean value of the system |
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* property named <code>"prop"</code> as a privileged action: |
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* <pre> |
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* boolean b = java.security.AccessController.doPrivileged |
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* (new GetBooleanAction("prop")).booleanValue(); |
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* </pre> |
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* |
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* @author Roland Schemers |
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* @see java.security.PrivilegedAction |
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* @see java.security.AccessController |
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* @since 1.2 |
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*/ |
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public class GetBooleanAction |
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implements java.security.PrivilegedAction<Boolean> { |
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private String theProp; |
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/** |
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* Constructor that takes the name of the system property whose boolean |
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* value needs to be determined. |
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* |
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* @param theProp the name of the system property. |
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*/ |
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public GetBooleanAction(String theProp) { |
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this.theProp = theProp; |
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} |
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/** |
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* Determines the boolean value of the system property whose name was |
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* specified in the constructor. |
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* |
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* @return the <code>Boolean</code> value of the system property. |
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*/ |
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public Boolean run() { |
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return Boolean.getBoolean(theProp); |
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} |
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/** |
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* Convenience method to get a property without going through doPrivileged |
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* if no security manager is present. This is unsafe for inclusion in a |
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* public API but allowable here since this class is now encapsulated. |
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* |
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* Note that this method performs a privileged action using caller-provided |
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* inputs. The caller of this method should take care to ensure that the |
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* inputs are not tainted and the returned property is not made accessible |
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* to untrusted code if it contains sensitive information. |
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* |
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* @param theProp the name of the system property. |
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*/ |
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public static boolean privilegedGetProperty(String theProp) { |
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if (System.getSecurityManager() == null) { |
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return Boolean.getBoolean(theProp); |
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} else { |
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return AccessController.doPrivileged( |
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new GetBooleanAction(theProp)); |
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} |
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} |
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} |