    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.net.tftp;
    019
    020import java.net.DatagramPacket;
    021import java.net.InetAddress;
    022
    023/***
    024 * A class derived from TFTPRequestPacket definiing a TFTP read request
    025 * packet type.
    026 * <p>
    027 * Details regarding the TFTP protocol and the format of TFTP packets can
    028 * be found in RFC 783.  But the point of these classes is to keep you
    029 * from having to worry about the internals.  Additionally, only very
    030 * few people should have to care about any of the TFTPPacket classes
    031 * or derived classes.  Almost all users should only be concerned with the
    032 * {@link org.apache.commons.net.tftp.TFTPClient} class
    033 * {@link org.apache.commons.net.tftp.TFTPClient#receiveFile receiveFile()}
    034 * and
    035 * {@link org.apache.commons.net.tftp.TFTPClient#sendFile sendFile()}
    036 * methods.
    037 * <p>
    038 * <p>
    039 * @see TFTPPacket
    040 * @see TFTPRequestPacket
    041 * @see TFTPPacketException
    042 * @see TFTP
    043 ***/
    044
    045public final class TFTPReadRequestPacket extends TFTPRequestPacket
    046{
    047
    048    /***
    049     * Creates a read request packet to be sent to a host at a
    050     * given port with a filename and transfer mode request.
    051     * <p>
    052     * @param destination  The host to which the packet is going to be sent.
    053     * @param port  The port to which the packet is going to be sent.
    054     * @param filename The requested filename.
    055     * @param mode The requested transfer mode.  This should be on of the TFTP
    056     *        class MODE constants (e.g., TFTP.NETASCII_MODE).
    057     ***/
    058    public TFTPReadRequestPacket(InetAddress destination, int port,
    059                                 String filename, int mode)
    060    {
    061        super(destination, port, TFTPPacket.READ_REQUEST, filename, mode);
    062    }
    063
    064    /***
    065     * Creates a read request packet of based on a received
    066     * datagram and assumes the datagram has already been identified as a
    067     * read request.  Assumes the datagram is at least length 4, else an
    068     * ArrayIndexOutOfBoundsException may be thrown.
    069     * <p>
    070     * @param datagram  The datagram containing the received request.
    071     * @throws TFTPPacketException  If the datagram isn't a valid TFTP
    072     *         request packet.
    073     ***/
    074    TFTPReadRequestPacket(DatagramPacket datagram) throws TFTPPacketException
    075    {
    076        super(TFTPPacket.READ_REQUEST, datagram);
    077    }
    078
    079}