fsm.java

状态机设计源代码

/*************************************************************************************************
** Project:     FSMGenerator
** Package:     FSMApi
** Module:      FSMApi::Java
** File:        FSM.java
** Date:        2002.08.01
** Author:      Pavel Bekkerman ([e-mail])
** Copyright:   Copyright (C) 2002 Pavel Bekkerman
** License:
**              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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
**
** Contact:     Pavel Bekkerman ([e-mail])
*************************************************************************************************/

package FSMApi;

public class FSM
{
  protected AbstractFSM m_fsm;
  protected boolean m_bFinal = false;

  // interface
  public FSM( AbstractFSM fsm )
  {
    m_fsm = fsm;
  }

  public boolean IsFinal() throws FSMException
  {
    return m_bFinal;
  }

  public void Initialize() throws FSMException
  {
    try
    {
      idStateCurrent = m_fsm._getStartState();
      m_fsm._processStateEnter( idStateCurrent );
      m_bFinal = m_fsm._isFinalState( idStateCurrent );
    }
    catch( FSMException e )
    {
      throw e;
    }
  }

  public void Process( int idEvent ) throws FSMException
  {
    FSMIDPair idpair;

    try
    {
      m_fsm._processEvent( idEvent );

      idpair = m_fsm._getNextIncarnation( idStateCurrent, idEvent );

	// PB: Commented out
	// Even if the next state is the current state (staying in the state), we should exit the state, take transition, and reneter the state!!!
      	// if( idpair.idSecond == idStateCurrent )
        // return;

      m_fsm._processStateExit( idStateCurrent );
      m_fsm._processTransition( idpair.idFirst );

      idStateCurrent = idpair.idSecond;
      m_fsm._processStateEnter( idStateCurrent );
      m_bFinal = m_fsm._isFinalState( idStateCurrent );
    }
    catch( FSMException e )
    {
      throw e;
    }
  }

  public void Attach( FSM fsm ) throws FSMException
  {
  }

  public void Finalize() throws FSMException
  {
  }

  //
  protected int  idStateCurrent;
}