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  package org.apache.commons.net.ntp;
  /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */


Common NtpUtils Helper class.

Author(s):
Jason Mathews, MITRE Corp
Version:
$Revision: 1299238 $
 
 public final class NtpUtils {

    
Returns 32-bit integer address to IPv4 address string "%d.%d.%d.%d" format.

Parameters:
address the 32-bit address
Returns:
the raw IP address in a string format.
 
      public static String getHostAddress(int address)
      {
           return ((address >>> 24) & 0xFF) + "." +
                  ((address >>> 16) & 0xFF) + "." +
                  ((address >>>  8) & 0xFF) + "." +
                  ((address >>>  0) & 0xFF);
      }

    
Returns NTP packet reference identifier as IP address.

Parameters:
packet NTP packet
Returns:
the packet reference id (as IP address) in "%d.%d.%d.%d" format.
 
      public static String getRefAddress(NtpV3Packet packet)
      {
          int address = (packet == null) ? 0 : packet.getReferenceId();
          return getHostAddress(address);
      }

    
Get refId as reference clock string (e.g. GPS, WWV, LCL). If string is invalid (non-ASCII character) then returns empty string "". For details refer to the Comprehensive List of Clock Drivers.

Parameters:
message
Returns:
reference clock string if primary NTP server
 
     public static String getReferenceClock(NtpV3Packet message) {
         if (message == null) {
             return "";
         }
         int refId = message.getReferenceId();
         if (refId == 0) {
             return "";
         }
         StringBuilder buf = new StringBuilder(4);
         // start at highest-order byte (0x4c434c00 -> LCL)
         for (int shiftBits = 24; shiftBits >= 0; shiftBits -= 8)
         {
             char c = (char) ((refId >>> shiftBits) & 0xff);
             if (c == 0) { // 0-terminated ASCII string
                 break;
             }
             if (!Character.isLetterOrDigit(c)) {
                 return "";
             }
             buf.append(c);
         }
         return buf.toString();
     }

    
Return human-readable name of message mode type (RFC 1305).

Parameters:
mode
Returns:
mode name
 
     public static String getModeName(int mode)
     {
         switch (mode) {
             case .:
                 return "Reserved";
             case .:
                return "Symmetric Active";
            case .:
                return "Symmetric Passive";
            case .:
                return "Client";
            case .:
                return "Server";
            case .:
                return "Broadcast";
            case .:
                return "Control";
            case .:
                return "Private";
            default:
                return "Unknown";
        }
    }
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