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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 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 | */ | ||
| 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 | */ | ||
| 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 | */ | ||
| 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 | } | ||