code: //==============================================================================
  //	
  //	Copyright (c) 2002-
  //	Authors:
  //	* Dave Parker <d.a.parker@cs.bham.ac.uk> (University of Birmingham/Oxford)
  //	
  //------------------------------------------------------------------------------
  //	
  //	This file is part of PRISM.
  //	
  //	PRISM 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.
  //	
  //	PRISM 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 PRISM; if not, write to the Free Software Foundation,
  //	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  //	
  //==============================================================================
  
  package explicit.rewards;
  
  import explicit.Model;
  import explicit.Product;
  
  
  /**
   * Explicit-state representation of a DTMC rewards structure, constructed (implicitly)
   * from an MDP rewards structure and a memoryless deterministic strategy, specified as an array of integer indices.
   * This class is read-only: most of data is pointers to other model info.
   */
  public class MCRewardsFromMDPRewards implements MCRewards
  {
  	// MDP rewards
  	protected MDPRewards mdpRewards;
  	// Strategy (array of choice indices; -1 denotes no choice)
  	protected int strat[];
  
  	/**
  	 * Constructor: create from MDP rewards and memoryless adversary.
  	 */
  	public MCRewardsFromMDPRewards(MDPRewards mdpRewards, int strat[])
  	{
  		this.mdpRewards = mdpRewards;
  		this.strat = strat;
  	}
  
  	@Override
  	public double getStateReward(int s)
  	{
  		// For now, state/transition rewards from MDP are both put into state reward
  		// This works fine for cumulative rewards, but not instantaneous ones
  		return mdpRewards.getStateReward(s) + mdpRewards.getTransitionReward(s, strat[s]);
  	}
  	
  	@Override
  	public MCRewards liftFromModel(Product<? extends Model> product)
  	{
  		throw new UnsupportedOperationException();
  	}
  
  	@Override
  	public boolean hasTransitionRewards()
  	{
  		// only state rewards
  		return false;
  	}
  }
  