package SmtpServer;import java.io.InputStream;import java.io.IOException;public class Request {	public static final int SEND  = 0;			//SEND 	public static final int SEND_OR_MAIL = 1;	//SOML	public static final int SEND_AND_MAIL  = 2;	//SAML	public static final int RESET = 3;			//REST	public static final int VERIFY = 4;			//VRFY	public static final int EXPAND = 5;			//EXPN	public static final int HELP = 6;			//HELP 	public static final int NOOP = 7;			//NOOP 	public static final int QUIT = 8;			//QUIT 	public static final int TURN = 9;			//TURN 	public static final int HELO = 10;			//HELO 	public static final int MAIL = 11;			//MAIL  	public static final int RECIPIENT = 12;		//RCPT  	public static final int DATA = 13;			//DATA  		public static final int UNKNOWN_CMD = 99;	//unknow cmd			public static final int ERROR = -1;		private InputStream input;	private String request;	private String cmd;	private int requestType;	private String domain;	private String reversePath;	private String forwardPath;	private String string;	private String user;		public String getRequest() { return request; }	public String getRequestCmd() { return cmd; }	public int getRequestType() { return requestType; }	public String Domain() { return domain; }	public String getReversePath() { return reversePath; }	public String getForwardPath() { return forwardPath; }	public String getString() { return string; }	public String getUser() { return user; }	public void clear() {		domain = "";		reversePath = "";		forwardPath = "";		string = "";		user = "";	}		public Request() {		requestType = ERROR;	}  	public Request(InputStream input) {    	this.input = input;  	}	private void parse() {		int index = request.indexOf(' ');		if (index <0) cmd = request.toUpperCase();			else cmd = request.substring(0,index).toUpperCase();		if (cmd.equals("SEND")) {			requestType = SEND;			int bracketL = request.indexOf('<');			int bracketR = request.indexOf('>');			reversePath = request.substring(bracketL+1,bracketR);			return;		}		if (cmd.equals("SOML")) {			requestType = SEND_OR_MAIL;			int bracketL = request.indexOf('<');			int bracketR = request.indexOf('>');			reversePath = request.substring(bracketL+1,bracketR);			return;		}		if (cmd.equals("SAML")) {			requestType = SEND_AND_MAIL ;			int bracketL = request.indexOf('<');			int bracketR = request.indexOf('>');			reversePath = request.substring(bracketL+1,bracketR);			return;		}		if (cmd.equals("REST")) {			requestType = RESET;			return;		}		if (cmd.equals("VRFY")) {			requestType = VERIFY;			string = request.substring(index+1,request.length());			return;		}		if (cmd.equals("EXPN")) {			requestType = EXPAND;			string = request.substring(index+1,request.length());			return;		}		if (cmd.equals("HELP")) {			requestType = HELP;			string = request.substring(index+1,request.length());			return;		}		if (cmd.equals("NOOP")) {			requestType = NOOP;			return;		}		if (cmd.equals("QUIT")) {			requestType = QUIT;			return;		}		if (cmd.equals("TURN")) {			requestType = TURN;			return;		}		if (cmd.equals("HELO")) {			requestType = HELO;			domain = request.substring(index+1,request.length());			return;		}		if (cmd.equals("MAIL")) {			requestType = MAIL;			int bracketL = request.indexOf('<');			int bracketR = request.indexOf('>');			reversePath = request.substring(bracketL+1,bracketR);			return;		}		if (cmd.equals("RCPT")) {			requestType = RECIPIENT;			int bracketL = request.indexOf('<');			int bracketR = request.indexOf('>');			forwardPath = request.substring(bracketL+1,bracketR);			int index2 = forwardPath.indexOf('@');			if (index2 >=0) user = forwardPath.substring(0,index2);			else user = "";			return;		}		if (cmd.equals("DATA")) {			requestType = DATA;			return;		}		requestType = UNKNOWN_CMD;	}		public String getMsg() {		StringBuffer requestBuf = new StringBuffer(2048);	    int i;	    byte[] buffer = new byte[2048];	    try {	      i = input.read(buffer);	    }	    catch (IOException e) {	      e.printStackTrace();	      i = -1;	    }	    for (int j=0; j<i; j++) {	      requestBuf.append((char) buffer[j]);	    }	    System.out.print(requestBuf.toString());	    request = requestBuf.toString().trim();	    parse();	    return request; 	      	}}