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| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.security.action; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * A convenience class for retrieving the string value of a system | ||
| 30 | * property as a privileged action. | ||
| 31 | * | ||
| 32 | * <p>An instance of this class can be used as the argument of | ||
| 33 | * <code>AccessController.doPrivileged</code>. | ||
| 34 | * | ||
| 35 | * <p>The following code retrieves the value of the system | ||
| 36 | * property named <code>"prop"</code> as a privileged action: <p> | ||
| 37 | * | ||
| 38 | * <pre> | ||
| 39 | * String s = java.security.AccessController.doPrivileged | ||
| 40 | * (new GetPropertyAction("prop")); | ||
| 41 | * </pre> | ||
| 42 | * | ||
| 43 | * @author Roland Schemers | ||
| 44 | * @see java.security.PrivilegedAction | ||
| 45 | * @see java.security.AccessController | ||
| 46 | * @since 1.2 | ||
| 47 | */ | ||
| 48 | |||
| 49 | public class GetPropertyAction | ||
| 50 | implements java.security.PrivilegedAction<String> { | ||
| 51 | private String theProp; | ||
| 52 | private String defaultVal; | ||
| 53 | |||
| 54 | /** | ||
| 55 | * Constructor that takes the name of the system property whose | ||
| 56 | * string value needs to be determined. | ||
| 57 | * | ||
| 58 | * @param theProp the name of the system property. | ||
| 59 | */ | ||
| 60 | public GetPropertyAction(String theProp) { | ||
| 61 | this.theProp = theProp; | ||
| 62 | } | ||
| 63 | |||
| 64 | /** | ||
| 65 | * Constructor that takes the name of the system property and the default | ||
| 66 | * value of that property. | ||
| 67 | * | ||
| 68 | * @param theProp the name of the system property. | ||
| 69 | * @param defaulVal the default value. | ||
| 70 | */ | ||
| 71 | public GetPropertyAction(String theProp, String defaultVal) { | ||
| 72 | this.theProp = theProp; | ||
| 73 | this.defaultVal = defaultVal; | ||
| 74 | } | ||
| 75 | |||
| 76 | /** | ||
| 77 | * Determines the string value of the system property whose | ||
| 78 | * name was specified in the constructor. | ||
| 79 | * | ||
| 80 | * @return the string value of the system property, | ||
| 81 | * or the default value if there is no property with that key. | ||
| 82 | */ | ||
| 83 | public String run() { | ||
| 84 | String value = System.getProperty(theProp); | ||
| 85 | return (value == null) ? defaultVal : value; | ||
| 86 | } | ||
| 87 | } | ||