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, "lib"); 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 new Integer(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 } 159
