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 integer value of a system property 30 * 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 integer value of the system 36 * property named <code>"prop"</code> as a privileged action. Since it does 37 * not pass a default value to be used in case the property 38 * <code>"prop"</code> is not defined, it has to check the result for 39 * <code>null</code>: <p> 40 * 41 * <pre> 42 * Integer tmp = java.security.AccessController.doPrivileged 43 * (new sun.security.action.GetIntegerAction("prop")); 44 * int i; 45 * if (tmp != null) { 46 * i = tmp.intValue(); 47 * } 48 * </pre> 49 * 50 * <p>The following code retrieves the integer value of the system 51 * property named <code>"prop"</code> as a privileged action, and also passes 52 * a default value to be used in case the property <code>"prop"</code> is not 53 * defined: <p> 54 * 55 * <pre> 56 * int i = ((Integer)java.security.AccessController.doPrivileged( 57 * new GetIntegerAction("prop", 3))).intValue(); 58 * </pre> 59 * 60 * @author Roland Schemers 61 * @see java.security.PrivilegedAction 62 * @see java.security.AccessController 63 * @since 1.2 64 */ 65 66 public class GetIntegerAction 67 implements java.security.PrivilegedAction<Integer> { 68 private String theProp; 69 private int defaultVal; 70 private boolean defaultSet = false; 71 72 /** 73 * Constructor that takes the name of the system property whose integer 74 * value needs to be determined. 75 * 76 * @param theProp the name of the system property. 77 */ GetIntegerAction(String theProp)78 public GetIntegerAction(String theProp) { 79 this.theProp = theProp; 80 } 81 82 /** 83 * Constructor that takes the name of the system property and the default 84 * value of that property. 85 * 86 * @param theProp the name of the system property. 87 * @param defaulVal the default value. 88 */ GetIntegerAction(String theProp, int defaultVal)89 public GetIntegerAction(String theProp, int defaultVal) { 90 this.theProp = theProp; 91 this.defaultVal = defaultVal; 92 this.defaultSet = true; 93 } 94 95 /** 96 * Determines the integer value of the system property whose name was 97 * specified in the constructor. 98 * 99 * <p>If there is no property of the specified name, or if the property 100 * does not have the correct numeric format, then an <code>Integer</code> 101 * object representing the default value that was specified in the 102 * constructor is returned, or <code>null</code> if no default value was 103 * specified. 104 * 105 * @return the <code>Integer</code> value of the property. 106 */ run()107 public Integer run() { 108 Integer value = Integer.getInteger(theProp); 109 if ((value == null) && defaultSet) 110 return new Integer(defaultVal); 111 return value; 112 } 113 } 114