GetPropertyAction.java revision 608:7e06bf1dcb09
1/* 2 * Copyright (c) 2004, 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 26package com.sun.corba.se.impl.orbutil ; 27 28/** 29 * A convenience class for retrieving the string value of a system 30 * property as a privileged action. This class is directly copied 31 * from sun.security.action.GetPropertyAction in order to avoid 32 * depending on the sun.security.action package. 33 * 34 * <p>An instance of this class can be used as the argument of 35 * <code>AccessController.doPrivileged</code>. 36 * 37 * <p>The following code retrieves the value of the system 38 * property named <code>"prop"</code> as a privileged action: <p> 39 * 40 * <pre> 41 * String s = (String) java.security.AccessController.doPrivileged( 42 * new GetPropertyAction("prop")); 43 * </pre> 44 * 45 * @author Roland Schemers 46 * @author Ken Cavanaugh 47 * @see java.security.PrivilegedAction 48 * @see java.security.AccessController 49 */ 50 51public class GetPropertyAction implements java.security.PrivilegedAction { 52 private String theProp; 53 private String defaultVal; 54 55 /** 56 * Constructor that takes the name of the system property whose 57 * string value needs to be determined. 58 * 59 * @param theProp the name of the system property. 60 */ 61 public GetPropertyAction(String theProp) { 62 this.theProp = theProp; 63 } 64 65 /** 66 * Constructor that takes the name of the system property and the default 67 * value of that property. 68 * 69 * @param theProp the name of the system property. 70 * @param defaulVal the default value. 71 */ 72 public GetPropertyAction(String theProp, String defaultVal) { 73 this.theProp = theProp; 74 this.defaultVal = defaultVal; 75 } 76 77 /** 78 * Determines the string value of the system property whose 79 * name was specified in the constructor. 80 * 81 * @return the string value of the system property, 82 * or the default value if there is no property with that key. 83 */ 84 public Object run() { 85 String value = System.getProperty(theProp); 86 return (value == null) ? defaultVal : value; 87 } 88} 89