- /*
- * Copyright 2001-2004 The Apache Software Foundation
- *
- * Licensed 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;
- import java.io.IOException;
- import java.net.DatagramPacket;
- import java.net.InetAddress;
-
- /***
- * The DaytimeUDPClient class is a UDP implementation of a client for the
- * Daytime protocol described in RFC 867. To use the class, merely
- * open a local datagram socket with
- * <a href="org.apache.commons.net.DatagramSocketClient.html#open"> open </a>
- * and call <a href="#getTime"> getTime </a> to retrieve the daytime
- * string, then
- * call <a href="org.apache.commons.net.DatagramSocketClient.html#close"> close </a>
- * to close the connection properly. Unlike
- * <a href="org.apache.commons.net.DaytimeTCPClient.html"> DaytimeTCPClient </a>,
- * successive calls to <a href="#getTime"> getTime </a> are permitted
- * without re-establishing a connection. That is because UDP is a
- * connectionless protocol and the Daytime protocol is stateless.
- * <p>
- * <p>
- * @author Daniel F. Savarese
- * @see DaytimeTCPClient
- ***/
-
- public final class DaytimeUDPClient extends DatagramSocketClient
- {
- /*** The default daytime port. It is set to 13 according to RFC 867. ***/
- public static final int DEFAULT_PORT = 13;
-
- private byte[] __dummyData = new byte[1];
- // Received dates should be less than 256 bytes
- private byte[] __timeData = new byte[256];
-
- /***
- * Retrieves the time string from the specified server and port and
- * returns it.
- * <p>
- * @param host The address of the server.
- * @param port The port of the service.
- * @return The time string.
- * @exception IOException If an error occurs while retrieving the time.
- ***/
- public String getTime(InetAddress host, int port) throws IOException
- {
- DatagramPacket sendPacket, receivePacket;
-
- sendPacket =
- new DatagramPacket(__dummyData, __dummyData.length, host, port);
- receivePacket = new DatagramPacket(__timeData, __timeData.length);
-
- _socket_.send(sendPacket);
- _socket_.receive(receivePacket);
-
- return new String(receivePacket.getData(), 0, receivePacket.getLength());
- }
-
- /*** Same as <code>getTime(host, DaytimeUDPClient.DEFAULT_PORT);</code> ***/
- public String getTime(InetAddress host) throws IOException
- {
- return getTime(host, DEFAULT_PORT);
- }
-
- }
-