    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.smtp;
    019
    020    /***
    021     * SMTPCommand stores a set of constants for SMTP command codes.  To interpret
    022     * the meaning of the codes, familiarity with RFC 821 is assumed.
    023     * The mnemonic constant names are transcriptions from the code descriptions
    024     * of RFC 821.  For those who think in terms of the actual SMTP commands,
    025     * a set of constants such as {@link #HELO  HELO } are provided
    026     * where the constant name is the same as the SMTP command.
    027     * <p>
    028     * <p>
    029     * @author Daniel F. Savarese
    030     ***/
    031
    032    public final class SMTPCommand
    033    {
    034
    035
    036        public static final int HELO = 0;
    037        public static final int MAIL = 1;
    038        public static final int RCPT = 2;
    039        public static final int DATA = 3;
    040        public static final int SEND = 4;
    041        public static final int SOML = 5;
    042        public static final int SAML = 6;
    043        public static final int RSET = 7;
    044        public static final int VRFY = 8;
    045        public static final int EXPN = 9;
    046        public static final int HELP = 10;
    047        public static final int NOOP = 11;
    048        public static final int TURN = 12;
    049        public static final int QUIT = 13;
    050
    051        public static final int HELLO = HELO;
    052        public static final int LOGIN = HELO;
    053        public static final int MAIL_FROM = MAIL;
    054        public static final int RECIPIENT = RCPT;
    055        public static final int SEND_MESSAGE_DATA = DATA;
    056        public static final int SEND_FROM = SEND;
    057        public static final int SEND_OR_MAIL_FROM = SOML;
    058        public static final int SEND_AND_MAIL_FROM = SAML;
    059        public static final int RESET = RSET;
    060        public static final int VERIFY = VRFY;
    061        public static final int EXPAND = EXPN;
    062        // public static final int HELP = HELP;
    063        // public static final int NOOP = NOOP;
    064        // public static final int TURN = TURN;
    065        // public static final int QUIT = QUIT;
    066        public static final int LOGOUT = QUIT;
    067
    068        // Cannot be instantiated
    069        private SMTPCommand()
    070        {}
    071
    072        static final String[] _commands = {
    073                                              "HELO", "MAIL FROM:", "RCPT TO:", "DATA", "SEND FROM:", "SOML FROM:",
    074                                              "SAML FROM:", "RSET", "VRFY", "EXPN", "HELP", "NOOP", "TURN", "QUIT"
    075                                          };
    076
    077
    078        /***
    079         * Retrieve the SMTP protocol command string corresponding to a specified
    080         * command code.
    081         * <p>
    082         * @param command The command code.
    083         * @return The SMTP protcol command string corresponding to a specified
    084         *         command code.
    085         ***/
    086        public static final String getCommand(int command)
    087        {
    088            return _commands[command];
    089        }
    090
    091    }