code: //==============================================================================
  //	
  //	Copyright (c) 2013-
  //	Authors:
  //	* Ernst Moritz Hahn <emhahn@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 param;
  
  import java.util.ArrayList;
  import java.util.HashSet;
  
  /**
   * Lumper for identity bisimulation.
   * That is, this class does basically nothing and is there for convenience
   * when choosing between different types of bisimulations. So, for
   * disabling bisimulation, one can use an object of this class.
   * 
   * @author Ernst Moritz Hahn <emhahn@cs.ox.ac.uk> (University of Oxford)
   */
  final class NullLumper extends Lumper {
  
  	/**
  	 * Creates a new identity bisimulation lumper for given Markov chain.
  	 * @param origPmc parametric Markov chain to create lumper for
  	 */
  	NullLumper(MutablePMC origPmc) {
  		this.origPmc = origPmc;
  		this.optPmc = origPmc;
  	}
  
  	/**
  	 * Does not have to do anything.
  	 */
  	@Override
  	protected void refineBlock(HashSet<Integer> oldBlock,
  			ArrayList<HashSet<Integer>> newBlocks) {
  	}
  
  	/**
  	 * Does not have to do anything.
  	 */
  	@Override
  	protected void buildQuotient() {
  	}
  
  	/**
  	 * Build identity mapping.
  	 * 
  	 * @return identity mapping
  	 */
  	@Override
  	int[] getOriginalToOptimised() {
  		int[] result = new int[origPmc.getNumStates()];
  		for (int state = 0; state < result.length; state++) {
  			result[state] = state;
  		}
  		return result;
  	}
  }
  