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    
018    package org.apache.commons.net.tftp;
019    
020    import java.net.DatagramPacket;
021    import 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    
045    public 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    }