1 /*
2 * Copyright (c) 2004, 2008, 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 package sun.net;
26
27 import java.io.*;
28 import java.security.AccessController;
29 import java.security.PrivilegedAction;
30 import java.util.Properties;
31
32 /*
33 * This class allows for centralized access to Networking properties.
34 * Default values are loaded from the file jre/lib/net.properties
35 *
36 *
37 * @author Jean-Christophe Collet
38 *
39 */
40
41 public class NetProperties {
42 static private Properties props = new Properties();
43 static {
44 AccessController.doPrivileged(
45 new PrivilegedAction<Void>() {
46 public Void run() {
47 loadDefaultProperties();
48 return null;
49 }});
50 }
51
52 private NetProperties() { };
53
54
55 /*
56 * Loads the default networking system properties
57 * the file is in jre/lib/net.properties
58 */
59 static private void loadDefaultProperties() {
60 String fname = System.getProperty("java.home");
61 if (fname == null) {
62 throw new Error("Can't find java.home ??");
63 }
64 try {
65 File f = new File(fname, "conf");
66 f = new File(f, "net.properties");
67 fname = f.getCanonicalPath();
68 InputStream in = new FileInputStream(fname);
69 BufferedInputStream bin = new BufferedInputStream(in);
70 props.load(bin);
71 bin.close();
72 } catch (Exception e) {
73 // Do nothing. We couldn't find or access the file
74 // so we won't have default properties...
75 }
76 }
77
78 /**
79 * Get a networking system property. If no system property was defined
80 * returns the default value, if it exists, otherwise returns
81 * <code>null</code>.
82 * @param key the property name.
83 * @throws SecurityException if a security manager exists and its
84 * <code>checkPropertiesAccess</code> method doesn't allow access
85 * to the system properties.
86 * @return the <code>String</code> value for the property,
87 * or <code>null</code>
88 */
89 static public String get(String key) {
90 String def = props.getProperty(key);
91 try {
92 return System.getProperty(key, def);
93 } catch (IllegalArgumentException e) {
94 } catch (NullPointerException e) {
95 }
96 return null;
97 }
98
99 /**
100 * Get an Integer networking system property. If no system property was
101 * defined returns the default value, if it exists, otherwise returns
102 * <code>null</code>.
103 * @param key the property name.
104 * @param defval the default value to use if the property is not found
105 * @throws SecurityException if a security manager exists and its
106 * <code>checkPropertiesAccess</code> method doesn't allow access
107 * to the system properties.
108 * @return the <code>Integer</code> value for the property,
109 * or <code>null</code>
110 */
111 static public Integer getInteger(String key, int defval) {
112 String val = null;
113
114 try {
115 val = System.getProperty(key, props.getProperty(key));
116 } catch (IllegalArgumentException e) {
117 } catch (NullPointerException e) {
118 }
119
120 if (val != null) {
121 try {
122 return Integer.decode(val);
123 } catch (NumberFormatException ex) {
124 }
125 }
126 return defval;
127 }
128
129 /**
130 * Get a Boolean networking system property. If no system property was
131 * defined returns the default value, if it exists, otherwise returns
132 * <code>null</code>.
133 * @param key the property name.
134 * @throws SecurityException if a security manager exists and its
135 * <code>checkPropertiesAccess</code> method doesn't allow access
136 * to the system properties.
137 * @return the <code>Boolean</code> value for the property,
138 * or <code>null</code>
139 */
140 static public Boolean getBoolean(String key) {
141 String val = null;
142
143 try {
144 val = System.getProperty(key, props.getProperty(key));
145 } catch (IllegalArgumentException e) {
146 } catch (NullPointerException e) {
147 }
148
149 if (val != null) {
150 try {
151 return Boolean.valueOf(val);
152 } catch (NumberFormatException ex) {
153 }
154 }
155 return null;
156 }
157
158 }