code: //==============================================================================
  //	
  //	Copyright (c) 2002-
  //	Authors:
  //	* Dave Parker <d.a.parker@cs.bham.ac.uk> (University of Birmingham/Oxford)
  //	* Nishan Kamaleson <nxk249@bham.ac.uk> (University of Birmingham)
  //	
  //------------------------------------------------------------------------------
  //	
  //	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 prism;
  
  import param.Function;
  import param.FunctionFactory;
  import param.ModelBuilder;
  import parser.ast.Expression;
  
  /**
   * Interface for classes that generate a probabilistic model:
   * given a particular model state (represented as a State object),
   * they provide information about the outgoing transitions from that state.
   */
  public interface ModelGeneratorSymbolic extends ModelGenerator
  {
  	// Extra methods for symbolic interface (bit of a hack for now:
  	// we assume some methods do not need to be implemented, e.g. getTransitionProbability,
  	// and and some new ones to replace them, e.g. getTransitionProbabilityFunction
  	
  	public void setSymbolic(ModelBuilder modelBuilder, FunctionFactory functionFactory);
  	
  	public Expression getUnknownConstantDefinition(String name) throws PrismException;
  
  	public Function getTransitionProbabilityFunction(int i, int offset) throws PrismException;
  }
  