1 package org.apache.commons.net;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache Commons" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 import java.io.BufferedReader;
58 import java.io.IOException;
59 import java.io.InputStreamReader;
60
61 /****
62 * The DaytimeTCPClient class is a TCP implementation of a client for the
63 * Daytime protocol described in RFC 867. To use the class, merely
64 * establish a connection with
65 * <a href="org.apache.commons.net.SocketClient.html#connect"> connect </a>
66 * and call <a href="#getTime"> getTime() </a> to retrieve the daytime
67 * string, then
68 * call <a href="org.apache.commons.net.SocketClient.html#disconnect"> disconnect </a>
69 * to close the connection properly.
70 * <p>
71 * <p>
72 * @author Daniel F. Savarese
73 * @see DaytimeUDPClient
74 ***/
75
76 public final class DaytimeTCPClient extends SocketClient
77 {
78 /**** The default daytime port. It is set to 13 according to RFC 867. ***/
79 public static final int DEFAULT_PORT = 13;
80
81 // Received dates will likely be less than 64 characters.
82 // This is a temporary buffer used while receiving data.
83 private char[] __buffer = new char[64];
84
85 /****
86 * The default DaytimeTCPClient constructor. It merely sets the default
87 * port to <code> DEFAULT_PORT </code>.
88 ***/
89 public DaytimeTCPClient ()
90 {
91 setDefaultPort(DEFAULT_PORT);
92 }
93
94 /****
95 * Retrieves the time string from the server and returns it. The
96 * server will have closed the connection at this point, so you should
97 * call
98 * <a href="org.apache.commons.net.SocketClient.html#disconnect"> disconnect </a>
99 * after calling this method. To retrieve another time, you must
100 * initiate another connection with
101 * <a href="org.apache.commons.net.SocketClient.html#connect"> connect </a>
102 * before calling <code> getTime() </code> again.
103 * <p>
104 * @return The time string retrieved from the server.
105 * @exception IOException If an error occurs while fetching the time string.
106 ***/
107 public String getTime() throws IOException
108 {
109 int read;
110 StringBuffer result = new StringBuffer(__buffer.length);
111 BufferedReader reader;
112
113 reader = new BufferedReader(new InputStreamReader(_input_));
114
115 while (true)
116 {
117 read = reader.read(__buffer, 0, __buffer.length);
118 if (read <= 0)
119 break;
120 result.append(__buffer, 0, read);
121 }
122
123 return result.toString();
124 }
125
126 }
127
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