1. /*

  2.  * Copyright 2001-2004 The Apache Software Foundation

  3.  *

  4.  * Licensed under the Apache License, Version 2.0 (the "License");

  5.  * you may not use this file except in compliance with the License.

  6.  * You may obtain a copy of the License at

  7.  *

  8.  *     http://www.apache.org/licenses/LICENSE-2.0

  9.  *

  10.  * Unless required by applicable law or agreed to in writing, software

  11.  * distributed under the License is distributed on an "AS IS" BASIS,

  12.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  13.  * See the License for the specific language governing permissions and

  14.  * limitations under the License.

  15.  */

  16. package org.apache.commons.net.pop3;

  17. 

  18. /***

  19.  * POP3Command stores POP3 command code constants.

  20.  * <p>

  21.  * <p>

  22.  * @author Daniel F. Savarese

  23.  ***/

  24. 

  25. public final class POP3Command

  26. {

  27.     /*** Send user name. ***/

  28.     public static final int USER = 0;

  29.     /*** Send password. ***/

  30.     public static final int PASS = 1;

  31.     /*** Quit session. ***/

  32.     public static final int QUIT = 2;

  33.     /*** Get status. ***/

  34.     public static final int STAT = 3;

  35.     /*** List message(s). ***/

  36.     public static final int LIST = 4;

  37.     /*** Retrieve message(s). ***/

  38.     public static final int RETR = 5;

  39.     /*** Delete message(s). ***/

  40.     public static final int DELE = 6;

  41.     /*** No operation.  Used as a session keepalive. ***/

  42.     public static final int NOOP = 7;

  43.     /*** Reset session. ***/

  44.     public static final int RSET = 8;

  45.     /*** Authorization. ***/

  46.     public static final int APOP = 9;

  47.     /*** Retrieve top number lines from message. ***/

  48.     public static final int TOP = 10;

  49.     /*** List unique message identifier(s). ***/

  50.     public static final int UIDL = 11;

  51. 

  52.     static final String[] _commands = {

  53.                                           "USER", "PASS", "QUIT", "STAT", "LIST", "RETR", "DELE", "NOOP", "RSET",

  54.                                           "APOP", "TOP", "UIDL"

  55.                                       };

  56. 

  57.     // Cannot be instantiated.

  58.     private POP3Command()

  59.     {}

  60. 

  61.     /***

  62.      * Get the POP3 protocol string command corresponding to a command code.

  63.      * <p>

  64.      * @return The POP3 protocol string command corresponding to a command code.

  65.      ***/

  66.     public static final String getCommand(int command)

  67.     {

  68.         return _commands[command];

  69.     }

  70. }