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    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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