--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/com/glavsoft/rfb/protocol/state/ProtocolState.java	Tue Jul 03 13:20:49 2012 +0900
@@ -0,0 +1,68 @@
+// Copyright (C) 2010, 2011 GlavSoft LLC.
+// All rights reserved.
+//
+//-------------------------------------------------------------------------
+// This file is part of the TightVNC software.  Please visit our Web site:
+//
+//                       http://www.tightvnc.com/
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//-------------------------------------------------------------------------
+//
+
+package com.glavsoft.rfb.protocol.state;
+
+import java.util.logging.Logger;
+
+import com.glavsoft.exceptions.AuthenticationFailedException;
+import com.glavsoft.exceptions.FatalException;
+import com.glavsoft.exceptions.TransportException;
+import com.glavsoft.exceptions.UnsupportedProtocolVersionException;
+import com.glavsoft.exceptions.UnsupportedSecurityTypeException;
+import com.glavsoft.rfb.protocol.ProtocolContext;
+import com.glavsoft.transport.Reader;
+import com.glavsoft.transport.Writer;
+
+abstract public class ProtocolState {
+	protected ProtocolContext context;
+	protected Logger logger;
+	protected Reader reader;
+	protected Writer writer;
+
+	public ProtocolState(ProtocolContext context) {
+		this.context = context;
+		this.logger = context.getLogger();
+		this.reader = context.getReader();
+		this.writer = context.getWriter();
+	}
+
+	/**
+	 * Change state of finite machine.
+	 *
+	 * @param state state, the Finite Machine will switched to
+	 */
+	protected void changeStateTo(ProtocolState state) {
+		context.changeStateTo(state);
+	}
+
+	/**
+	 * Carry out next step of protocol flow.
+	 *
+	 * @return false when no next protocol steps availabe, true - when need to continue
+	 */
+	abstract public boolean next() throws UnsupportedProtocolVersionException, TransportException,
+			UnsupportedSecurityTypeException, AuthenticationFailedException, FatalException;
+
+}