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org.apache.commons.net.DaytimeTCPClient |
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1 | /* |
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2 | * Copyright 2001-2005 The Apache Software Foundation |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.net; |
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17 | ||
18 | import java.io.BufferedReader; |
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19 | import java.io.IOException; |
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20 | import java.io.InputStreamReader; |
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21 | ||
22 | /*** |
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23 | * The DaytimeTCPClient class is a TCP implementation of a client for the |
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24 | * Daytime protocol described in RFC 867. To use the class, merely |
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25 | * establish a connection with |
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26 | * {@link org.apache.commons.net.SocketClient#connect connect } |
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27 | * and call {@link #getTime getTime() } to retrieve the daytime |
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28 | * string, then |
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29 | * call {@link org.apache.commons.net.SocketClient#disconnect disconnect } |
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30 | * to close the connection properly. |
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31 | * <p> |
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32 | * <p> |
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33 | * @author Daniel F. Savarese |
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34 | * @see DaytimeUDPClient |
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35 | ***/ |
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36 | ||
37 | public final class DaytimeTCPClient extends SocketClient |
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38 | { |
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39 | /*** The default daytime port. It is set to 13 according to RFC 867. ***/ |
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40 | public static final int DEFAULT_PORT = 13; |
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41 | ||
42 | // Received dates will likely be less than 64 characters. |
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43 | // This is a temporary buffer used while receiving data. |
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44 | 0 | private char[] __buffer = new class="keyword">char[64]; |
45 | ||
46 | /*** |
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47 | * The default DaytimeTCPClient constructor. It merely sets the default |
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48 | * port to <code> DEFAULT_PORT </code>. |
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49 | ***/ |
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50 | public DaytimeTCPClient () |
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51 | 0 | { |
52 | 0 | setDefaultPort(DEFAULT_PORT); |
53 | 0 | } |
54 | ||
55 | /*** |
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56 | * Retrieves the time string from the server and returns it. The |
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57 | * server will have closed the connection at this point, so you should |
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58 | * call |
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59 | * {@link org.apache.commons.net.SocketClient#disconnect disconnect } |
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60 | * after calling this method. To retrieve another time, you must |
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61 | * initiate another connection with |
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62 | * {@link org.apache.commons.net.SocketClient#connect connect } |
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63 | * before calling <code> getTime() </code> again. |
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64 | * <p> |
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65 | * @return The time string retrieved from the server. |
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66 | * @exception IOException If an error occurs while fetching the time string. |
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67 | ***/ |
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68 | public String getTime() throws IOException |
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69 | { |
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70 | int read; |
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71 | 0 | StringBuffer result = new StringBuffer(__buffer.length); |
72 | BufferedReader reader; |
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73 | ||
74 | 0 | reader = new BufferedReader(class="keyword">new InputStreamReader(_input_)); |
75 | ||
76 | while (true) |
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77 | { |
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78 | 0 | read = reader.read(__buffer, 0, __buffer.length); |
79 | 0 | if (read <= 0) |
80 | 0 | break; |
81 | 0 | result.append(__buffer, 0, read); |
82 | } |
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83 | ||
84 | 0 | return result.toString(); |
85 | } |
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86 | ||
87 | } |
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88 |
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