/*
* Copyright (c) 2004, 2008, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package sun.net;
import jdk.internal.util.StaticProperty;
import java.io.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Properties;
/*
* This class allows for centralized access to Networking properties.
* Default values are loaded from the file jre/lib/net.properties
*
*
* @author Jean-Christophe Collet
*
*/
public class NetProperties {
private static Properties props = new Properties();
static {
AccessController.doPrivileged(
new PrivilegedAction<Void>() {
public Void run() {
loadDefaultProperties();
return null;
}});
}
private NetProperties() { };
/*
* Loads the default networking system properties
* the file is in jre/lib/net.properties
*/
private static void loadDefaultProperties() {
String fname = StaticProperty.javaHome();
if (fname == null) {
throw new Error("Can't find java.home ??");
}
try {
File f = new File(fname, "conf");
f = new File(f, "net.properties");
fname = f.getCanonicalPath();
InputStream in = new FileInputStream(fname);
BufferedInputStream bin = new BufferedInputStream(in);
props.load(bin);
bin.close();
} catch (Exception e) {
// Do nothing. We couldn't find or access the file
// so we won't have default properties...
}
}
Get a networking system property. If no system property was defined
returns the default value, if it exists, otherwise returns
null.
Params: - key – the property name.
Throws: - SecurityException – if a security manager exists and its
checkPropertiesAccess method doesn't allow access
to the system properties.
Returns: the String value for the property,
or null
/**
* Get a networking system property. If no system property was defined
* returns the default value, if it exists, otherwise returns
* <code>null</code>.
* @param key the property name.
* @throws SecurityException if a security manager exists and its
* <code>checkPropertiesAccess</code> method doesn't allow access
* to the system properties.
* @return the <code>String</code> value for the property,
* or <code>null</code>
*/
public static String get(String key) {
String def = props.getProperty(key);
try {
return System.getProperty(key, def);
} catch (IllegalArgumentException e) {
} catch (NullPointerException e) {
}
return null;
}
Get an Integer networking system property. If no system property was
defined returns the default value, if it exists, otherwise returns
null.
Params: - key – the property name.
- defval – the default value to use if the property is not found
Throws: - SecurityException – if a security manager exists and its
checkPropertiesAccess method doesn't allow access
to the system properties.
Returns: the Integer value for the property,
or null
/**
* Get an Integer networking system property. If no system property was
* defined returns the default value, if it exists, otherwise returns
* <code>null</code>.
* @param key the property name.
* @param defval the default value to use if the property is not found
* @throws SecurityException if a security manager exists and its
* <code>checkPropertiesAccess</code> method doesn't allow access
* to the system properties.
* @return the <code>Integer</code> value for the property,
* or <code>null</code>
*/
public static Integer getInteger(String key, int defval) {
String val = null;
try {
val = System.getProperty(key, props.getProperty(key));
} catch (IllegalArgumentException e) {
} catch (NullPointerException e) {
}
if (val != null) {
try {
return Integer.decode(val);
} catch (NumberFormatException ex) {
}
}
return defval;
}
Get a Boolean networking system property. If no system property was
defined returns the default value, if it exists, otherwise returns
null.
Params: - key – the property name.
Throws: - SecurityException – if a security manager exists and its
checkPropertiesAccess method doesn't allow access
to the system properties.
Returns: the Boolean value for the property,
or null
/**
* Get a Boolean networking system property. If no system property was
* defined returns the default value, if it exists, otherwise returns
* <code>null</code>.
* @param key the property name.
* @throws SecurityException if a security manager exists and its
* <code>checkPropertiesAccess</code> method doesn't allow access
* to the system properties.
* @return the <code>Boolean</code> value for the property,
* or <code>null</code>
*/
public static Boolean getBoolean(String key) {
String val = null;
try {
val = System.getProperty(key, props.getProperty(key));
} catch (IllegalArgumentException e) {
} catch (NullPointerException e) {
}
if (val != null) {
try {
return Boolean.valueOf(val);
} catch (NumberFormatException ex) {
}
}
return null;
}
}