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.pop3; 019 020 /*** 021 * POP3Command stores POP3 command code constants. 022 * <p> 023 * <p> 024 * @author Daniel F. Savarese 025 ***/ 026 027 public final class POP3Command 028 { 029 /*** Send user name. ***/ 030 public static final int USER = 0; 031 /*** Send password. ***/ 032 public static final int PASS = 1; 033 /*** Quit session. ***/ 034 public static final int QUIT = 2; 035 /*** Get status. ***/ 036 public static final int STAT = 3; 037 /*** List message(s). ***/ 038 public static final int LIST = 4; 039 /*** Retrieve message(s). ***/ 040 public static final int RETR = 5; 041 /*** Delete message(s). ***/ 042 public static final int DELE = 6; 043 /*** No operation. Used as a session keepalive. ***/ 044 public static final int NOOP = 7; 045 /*** Reset session. ***/ 046 public static final int RSET = 8; 047 /*** Authorization. ***/ 048 public static final int APOP = 9; 049 /*** Retrieve top number lines from message. ***/ 050 public static final int TOP = 10; 051 /*** List unique message identifier(s). ***/ 052 public static final int UIDL = 11; 053 054 static final String[] _commands = { 055 "USER", "PASS", "QUIT", "STAT", "LIST", "RETR", "DELE", "NOOP", "RSET", 056 "APOP", "TOP", "UIDL" 057 }; 058 059 // Cannot be instantiated. 060 private POP3Command() 061 {} 062 063 /*** 064 * Get the POP3 protocol string command corresponding to a command code. 065 * <p> 066 * @return The POP3 protocol string command corresponding to a command code. 067 ***/ 068 public static final String getCommand(int command) 069 { 070 return _commands[command]; 071 } 072 }