code: //==============================================================================
  //	
  //	Copyright (c) 2002-
  //	Authors:
  //	* Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford)
  //	* Vojtech Forejt <vojtech.forejt@cs.ox.ac.uk> (University of 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;
  
  /**
   * Classes that provide (read) access to explicit-state rewards for an STPG.
   * See the {@link explicit.STPG} interface for details of the accompanying model,
   * in particular, for an explanation of nested transitions. 
   */
  public interface STPGRewards extends MDPRewards
  {
  	/**
  	 * Get the transition reward for the {@code i,j}th nested choice from state {@code s}.
  	 */
  	public abstract double getNestedTransitionReward(int s, int i, int j);
  
  	/**
  	 * Build an MDPRewards object containing all the same rewards except for the nested ones.
  	 */
  	public abstract MDPRewards buildMDPRewards();
  
  	@Override
  	public STPGRewards liftFromModel(Product<? extends Model> product);
  }
  