    1   /*
    2    * Dumbster: a dummy SMTP server.
    3    * Copyright (C) 2003, Jason Paul Kitchen
    4    * lilnottsman@yahoo.com
    5    *
    6    * This library is free software; you can redistribute it and/or
    7    * modify it under the terms of the GNU Lesser General Public
    8    * License as published by the Free Software Foundation; either
    9    * version 2.1 of the License, or (at your option) any later version.
    10   *
    11   * This library is distributed in the hope that it will be useful,
    12   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    14   * Lesser General Public License for more details.
    15   *
    16   * You should have received a copy of the GNU Lesser General Public
    17   * License along with this library; if not, write to the Free Software
    18   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    19   */
    20  package com.dumbster.smtp;
    21
    22  /***
    23   * Represents an SMTP action or command.
    24   */
    25  public class SmtpActionType {
    26
    27  	/*** Internal value for the action type. */
    28  	private byte value;
    29
    30  	/*** Internal representation of the CONNECT action. */
    31  	private static final byte CONNECT_BYTE = 1;
    32
    33  	/*** Internal representation of the EHLO action. */
    34  	private static final byte EHLO_BYTE = 2;
    35
    36  	/*** Internal representation of the MAIL FROM action. */
    37  	private static final byte MAIL_BYTE = 3;
    38
    39  	/*** Internal representation of the RCPT action. */
    40  	private static final byte RCPT_BYTE = 4;
    41
    42  	/*** Internal representation of the DATA action. */
    43  	private static final byte DATA_BYTE = 5;
    44
    45  	/*** Internal representation of the DATA END (.) action. */
    46  	private static final byte DATA_END_BYTE = 6;
    47
    48  	/*** Internal representation of the QUIT action. */
    49  	private static final byte QUIT_BYTE = 7;
    50
    51  	/*** Internal representation of an unrecognized action: body text gets this action type. */
    52  	private static final byte UNREC_BYTE = 8;
    53
    54  	/*** Internal representation of the blank line action: separates headers and body text. */
    55  	private static final byte BLANK_LINE_BYTE = 9;
    56
    57  	/*** Internal representation of the stateless RSET action. */
    58  	private static final byte RSET_BYTE = -1;
    59
    60  	/*** Internal representation of the stateless VRFY action. */
    61  	private static final byte VRFY_BYTE = -2;
    62
    63  	/*** Internal representation of the stateless EXPN action. */
    64  	private static final byte EXPN_BYTE = -3;
    65
    66  	/*** Internal representation of the stateless HELP action. */
    67  	private static final byte HELP_BYTE = -4;
    68
    69  	/*** Internal representation of the stateless NOOP action. */
    70  	private static final byte NOOP_BYTE = -5;
    71
    72  	/*** CONNECT action. */
    73  	public static final SmtpActionType CONNECT = new SmtpActionType(CONNECT_BYTE);
    74
    75  	/*** EHLO action. */
    76  	public static final SmtpActionType EHLO = new SmtpActionType(EHLO_BYTE);
    77
    78  	/*** MAIL action. */
    79  	public static final SmtpActionType MAIL = new SmtpActionType(MAIL_BYTE);
    80
    81  	/*** RCPT action. */
    82  	public static final SmtpActionType RCPT = new SmtpActionType(RCPT_BYTE);
    83
    84  	/*** DATA action. */
    85  	public static final SmtpActionType DATA = new SmtpActionType(DATA_BYTE);
    86
    87  	/*** "." action. */
    88  	public static final SmtpActionType DATA_END = new SmtpActionType(DATA_END_BYTE);
    89
    90  	/*** Body text action. */
    91  	public static final SmtpActionType UNRECOG = new SmtpActionType(UNREC_BYTE);
    92
    93  	/*** QUIT action. */
    94  	public static final SmtpActionType QUIT = new SmtpActionType(QUIT_BYTE);
    95
    96  	/*** Header/body separator action. */
    97  	public static final SmtpActionType BLANK_LINE = new SmtpActionType(BLANK_LINE_BYTE);
    98
    99  	/*** Stateless RSET action. */
    100 	public static final SmtpActionType RSET = new SmtpActionType(RSET_BYTE);
    101
    102 	/*** Stateless VRFY action. */
    103 	public static final SmtpActionType VRFY = new SmtpActionType(VRFY_BYTE);
    104
    105 	/*** Stateless EXPN action. */
    106 	public static final SmtpActionType EXPN = new SmtpActionType(EXPN_BYTE);
    107
    108 	/*** Stateless HELP action. */
    109 	public static final SmtpActionType HELP = new SmtpActionType(HELP_BYTE);
    110
    111 	/*** Stateless NOOP action. */
    112 	public static final SmtpActionType NOOP = new SmtpActionType(NOOP_BYTE);
    113
    114 	/***
    115 	 * Create a new SMTP action type. Private to ensure no invalid values.
    116 	 * @param value one of the _BYTE values
    117 	 */
    118 	private SmtpActionType(byte value) {
    119 		this.value = value;
    120 	}
    121
    122 	/***
    123 	 * Indicates whether the action is stateless or not.
    124 	 * @return true iff the action is stateless
    125 	 */
    126 	public boolean isStateless() {
    127 		return value < 0;
    128 	}
    129
    130 	/***
    131 	 * String representation of this SMTP action type.
    132 	 * @return a String
    133 	 */
    134 	public String toString() {
    135 		switch (value) {
    136 			case CONNECT_BYTE:
    137 				return "Connect";
    138 			case EHLO_BYTE:
    139 				return "EHLO";
    140 			case MAIL_BYTE:
    141 				return "MAIL";
    142 			case RCPT_BYTE:
    143 				return "RCPT";
    144 			case DATA_BYTE:
    145 				return "DATA";
    146 			case DATA_END_BYTE:
    147 				return ".";
    148 			case QUIT_BYTE:
    149 				return "QUIT";
    150 			case RSET_BYTE:
    151 				return "RSET";
    152 			case VRFY_BYTE:
    153 				return "VRFY";
    154 			case EXPN_BYTE:
    155 				return "EXPN";
    156 			case HELP_BYTE:
    157 				return "HELP";
    158 			case NOOP_BYTE:
    159 				return "NOOP";
    160 			case UNREC_BYTE:
    161 				return "Unrecognized command / data";
    162 			case BLANK_LINE_BYTE:
    163 				return "Blank line";
    164 			default:
    165 				return "Unknown";
    166 		}
    167 	}
    168 }