code: //==============================================================================
  //	
  //	Copyright (c) 2002-
  //	Authors:
  //	* Dave Parker <david.parker@comlab.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;
  
  import java.util.BitSet;
  import java.util.List;
  
  import parser.State;
  import prism.PrismException;
  
  /**
   * Interface for simple mutable explicit-state model representations.
   */
  public interface ModelSimple extends Model
  {
  	/**
  	 * Add a state to the list of initial states.
  	 */
  	public abstract void addInitialState(int i);
  
  	/**
  	 * Build (anew) from a list of transitions exported explicitly by PRISM (i.e. a .tra file).
  	 * Note that initial states are not configured (since this info is not in the file),
  	 * so this needs to be done separately (using {@link #addInitialState(int)}.
  	 */
  	public abstract void buildFromPrismExplicit(String filename) throws PrismException;
  
  	/**
  	 * Clear all information for a state (i.e. remove all transitions).
  	 */
  	public abstract void clearState(int i);
  
  	/**
  	 * Add a new state and return its index.
  	 */
  	public abstract int addState();
  
  	/**
  	 * Add multiple new states.
  	 */
  	public abstract void addStates(int numToAdd);
  
  	/**
  	 * Set the associated (read-only) state list.
  	 */
  	public void setStatesList(List<State> statesList);
  
  	/**
  	 * Adds a label and the set the states that satisfy it.
  	 * Any existing label with the same name is overwritten.
  	 * @param name The name of the label
  	 * @param states The states that satisfy the label 
  	 */
  	public void addLabel(String name, BitSet states);
  }