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  /*
   * 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.
  */
 
 package org.apache.commons.net.time;
 
 import java.util.Date;
 
 import  org.apache.commons.net.DatagramSocketClient;

The TimeUDPClient class is a UDP implementation of a client for the Time protocol described in RFC 868. To use the class, merely open a local datagram socket with open and call getTime or getDate to retrieve the time. Then call close to close the connection properly. Unlike org.apache.commons.net.time.TimeTCPClient, successive calls to getTime or getDate are permitted without re-establishing a connection. That is because UDP is a connectionless protocol and the Time protocol is stateless.

See also:
TimeTCPClient
 
 
 public final class TimeUDPClient extends DatagramSocketClient
 {
    
The default time port. It is set to 37 according to RFC 868. *
 
     public static final int DEFAULT_PORT = 37;

    
The number of seconds between 00:00 1 January 1900 and 00:00 1 January 1970. This value can be useful for converting time values to other formats.
 
     public static final long SECONDS_1900_TO_1970 = 2208988800L;
 
     private final byte[] __dummyData = new byte[1];
     private final byte[] __timeData = new byte[4];

    
Retrieves the time from the specified server and port and returns it. The time is the number of seconds since 00:00 (midnight) 1 January 1900 GMT, as specified by RFC 868. This method reads the raw 32-bit big-endian unsigned integer from the server, converts it to a Java long, and returns the value.

Parameters:
host The address of the server.
port The port of the service.
Returns:
The time value retrieved from the server.
Throws:
IOException If an error occurs while retrieving the time.
 
     public long getTime(InetAddress hostint portthrows IOException
     {
         long time;
         DatagramPacket sendPacketreceivePacket;
 
         sendPacket =
             new DatagramPacket(.hostport);
         receivePacket = new DatagramPacket(.);
 
         _socket_.send(sendPacket);
         _socket_.receive(receivePacket);
 
         time = 0L;
         time |= ((([0] & 0xff) << 24) & 0xffffffffL);
         time |= ((([1] & 0xff) << 16) & 0xffffffffL);
         time |= ((([2] & 0xff) << 8) & 0xffffffffL);
         time |= (([3] & 0xff) & 0xffffffffL);
 
         return time;
     }

    
Same as getTime(host, DEFAULT_PORT); *
 
     public long getTime(InetAddress hostthrows IOException
     {
         return getTime(host);
     }


    
Retrieves the time from the server and returns a Java Date containing the time converted to the local timezone.

Parameters:
host The address of the server.
port The port of the service.
Returns:
A Date value containing the time retrieved from the server converted to the local timezone.
Throws:
IOException If an error occurs while fetching the time.
    public Date getDate(InetAddress hostint portthrows IOException
    {
        return new Date((getTime(hostport) - )*1000L);
    }


    
Same as getTime(host, DEFAULT_PORT); *
    public Date getDate(InetAddress hostthrows IOException
    {
        return new Date((getTime(host) -
                         )*1000L);
    }
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