/*
 * 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
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
 * <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
 * <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
 * <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;
 }

}