Context.hxx
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上传日期:2013-07-25
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- #if !defined(CONTEXT_DOT_H)
- #define CONTEXT_DOT_H
- /* ====================================================================
- * The Vovida Software License, Version 1.0
- *
- * Copyright (c) 2000 Vovida Networks, Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The names "VOCAL", "Vovida Open Communication Application Library",
- * and "Vovida Open Communication Application Library (VOCAL)" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact vocal@vovida.org.
- *
- * 4. Products derived from this software may not be called "VOCAL", nor
- * may "VOCAL" appear in their name, without prior written
- * permission of Vovida Networks, Inc.
- *
- * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
- * NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL VOVIDA
- * NETWORKS, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT DAMAGES
- * IN EXCESS OF $1,000, NOR FOR ANY INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
- * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
- * DAMAGE.
- *
- * ====================================================================
- *
- * This software consists of voluntary contributions made by Vovida
- * Networks, Inc. and many individuals on behalf of Vovida Networks,
- * Inc. For more information on Vovida Networks, Inc., please see
- * <http://www.vovida.org/>.
- *
- */
- static const char* const Context_hxx_Version =
- "$Id: Context.hxx,v 1.1 2001/03/30 02:49:20 icahoon Exp $";
- #include "Writer.hxx"
- /** Infrastructure common to VOCAL.
- */
- namespace Vocal
- {
- /** Infrastructure in VOCAL related to "algorithms and the assignment of
- * responsibilities between objects".<br><br>
- *
- * See Design Patterns, ISBN 0-201-63361-2, Chapter 5.
- */
- namespace Behavioral
- {
- class Stimulus;
- class StateInterface;
- /** The basis of a finite state machine.<br><br>
- *
- * The context is responsible for maintaining the current state of the
- * finite state machine, and provide and means to set and verify the
- * starting and stopping states of that machine. Users of finite
- * state machines will typically only interface with the finite state
- * machine class that extends this class.
- *
- * @see Vocal::Behavioral::StateInterface
- * @see Vocal::Behavioral::Stimulus
- */
- class Context : public Vocal::IO::Writer
- {
- protected:
- /** Default constructor
- */
- Context();
- public:
- /** Virtual destructor
- */
- virtual ~Context();
- /** Reset the current state back to the starting state.
- */
- void reset() throw();
- /** Reset the current state to the given state.
- */
- void reset(StateInterface &) throw();
- /** Set the starting state to the given state.
- */
- void startState(StateInterface &);
- /** Query the context whether the current state is the starting state.
- */
- bool inStartState() const;
- /** Set the stopping state to the given state.
- */
- void stopState(StateInterface &);
- /** Query the context whether the current state is the stopping state.
- */
- bool inStopState() const;
- /** Pass a stimulus to the current state.
- */
- void stimulate(const Stimulus &) throw ();
- /** Write the context to am ostream.
- */
- virtual ostream & writeTo(ostream &) const;
- /** The name of this class of context.
- */
- virtual const char * name() const = 0;
- /** Query the context whether the current state is the same as the
- * given state.
- */
- bool verifyState(const StateInterface &);
- private:
-
- StateInterface * state_;
- StateInterface * startState_;
- StateInterface * stopState_;
- };
- } // namespace Behavioral
- } // namespace Vocal
- #endif // !defined(CONTEXT_DOT_H)