01: /*
02: * JBoss, Home of Professional Open Source.
03: * Copyright 2006, Red Hat Middleware LLC, and individual contributors
04: * as indicated by the @author tags. See the copyright.txt file in the
05: * distribution for a full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * published by the Free Software Foundation; either version 2.1 of
10: * the License, or (at your option) any later version.
11: *
12: * This software is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this software; if not, write to the Free
19: * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21: */
22: package org.jboss.mx.util;
23:
24: import java.security.AccessController;
25: import java.security.PrivilegedAction;
26:
27: /** System property access utilties that encapsulate the
28: * AccessController.doPrivileged calls required when running with a
29: * security manager. Use to access system properties when the callers
30: * permissions should not dictate whether or not access is allowed.
31: *
32: * @author Scott.Stark@jboss.org
33: * @version $Revision: 57200 $
34: */
35: public class PropertyAccess {
36: static class PropertyReadAction implements PrivilegedAction {
37: private String name;
38: private String defaultValue;
39:
40: PropertyReadAction(String name, String defaultValue) {
41: this .name = name;
42: this .defaultValue = defaultValue;
43: }
44:
45: public Object run() {
46: return System.getProperty(name, defaultValue);
47: }
48: }
49:
50: static class PropertyWriteAction implements PrivilegedAction {
51: private String name;
52: private String value;
53:
54: PropertyWriteAction(String name, String value) {
55: this .name = name;
56: this .value = value;
57: }
58:
59: public Object run() {
60: return System.setProperty(name, value);
61: }
62: }
63:
64: public static String getProperty(String name) {
65: return getProperty(name, null);
66: }
67:
68: public static String getProperty(String name, String defaultValue) {
69: PrivilegedAction action = new PropertyReadAction(name,
70: defaultValue);
71: String property = (String) AccessController
72: .doPrivileged(action);
73: return property;
74: }
75:
76: public static String setProperty(String name, String value) {
77: PrivilegedAction action = new PropertyWriteAction(name, value);
78: String property = (String) AccessController
79: .doPrivileged(action);
80: return property;
81: }
82:
83: }
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