Tidy-up of Model classes.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@742 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/prism/Model.java

@@ -35,7 +35,12 @@ import parser.*;
 
 public interface Model
 {
-	String getType();
+	public static final int DTMC = 1; 
+	public static final int CTMC = 2; 
+	public static final int MDP = 3; 
+	
+	int getType();
+	String getTypeString();
 
 	int getNumModules();
 	String[] getModuleNames();

prism/src/prism/NondetModelChecker.java

@@ -3,6 +3,7 @@
 //	Copyright (c) 2002-
 //	Authors:
 //	* Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford, formerly University of Birmingham)
+//	* Carlos S. Bederián (Universidad Nacional de Córdoba)
 //	
 //------------------------------------------------------------------------------
 //	
@@ -26,12 +27,19 @@
 
 package prism;
 
+import java.util.*;
+
 import jdd.*;
 import dv.*;
 import mtbdd.*;
+import simulator.SimulatorException;
 import sparse.*;
 import hybrid.*;
 import parser.ast.*;
+import parser.visitor.ASTTraverse;
+import parser.visitor.ASTTraverseModify;
+import jltl2ba.APElement;
+import jltl2dstar.*;
 
 /*
  * Model checker for MDPs
@@ -173,7 +181,7 @@ public class NondetModelChecker extends StateModelChecker
 
 		// Compute probabilities
 		boolean qual = pb != null && ((p == 0) || (p == 1)) && precomp;
-		probs = checkProbPathExpression(expr.getExpression(), qual, min);
+		probs = checkProbPathFormula(expr.getExpression(), qual, min);
 
 		// Print out probabilities
 		if (verbose) {
@@ -302,20 +310,22 @@ public class NondetModelChecker extends StateModelChecker
 		}
 	}
 
-	// Contents of a P operator
+	// Contents of a P operator, i.e. a path formula
 
-	protected StateProbs checkProbPathExpression(Expression expr, boolean qual, boolean min) throws PrismException
+	protected StateProbs checkProbPathFormula(Expression expr, boolean qual, boolean min) throws PrismException
 	{
 		// Test whether this is a simple path formula (i.e. PCTL)
 		// and then pass control to appropriate method. 
 		if (expr.isSimplePathFormula()) {
-			return checkProbPathExpressionSimple(expr, qual, min);
+			return checkProbPathFormulaSimple(expr, qual, min);
 		} else {
-			throw new PrismException("LTL-style path formulas are not supported");
+			return checkProbPathFormulaLTL(expr, qual, min);
 		}
 	}
 
-	protected StateProbs checkProbPathExpressionSimple(Expression expr, boolean qual, boolean min)
+	// Simple path formula for P operator (one temporal op, possibly negated)
+
+	protected StateProbs checkProbPathFormulaSimple(Expression expr, boolean qual, boolean min)
 			throws PrismException
 	{
 		StateProbs probs = null;
@@ -326,12 +336,12 @@ public class NondetModelChecker extends StateModelChecker
 			// Parentheses
 			if (exprUnary.getOperator() == ExpressionUnaryOp.PARENTH) {
 				// Recurse
-				probs = checkProbPathExpressionSimple(exprUnary.getOperand(), qual, min);
+				probs = checkProbPathFormulaSimple(exprUnary.getOperand(), qual, min);
 			}
 			// Negation
 			else if (exprUnary.getOperator() == ExpressionUnaryOp.NOT) {
 				// Flip min/max, then subtract from 1 
-				probs = checkProbPathExpressionSimple(exprUnary.getOperand(), qual, !min);
+				probs = checkProbPathFormulaSimple(exprUnary.getOperand(), qual, !min);
 				probs.subtractFromOne();
 			}
 		}
@@ -352,7 +362,7 @@ public class NondetModelChecker extends StateModelChecker
 			}
 			// Anything else - convert to until and recurse
 			else {
-				probs = checkProbPathExpressionSimple(exprTemp.convertToUntilForm(), qual, min);
+				probs = checkProbPathFormulaSimple(exprTemp.convertToUntilForm(), qual, min);
 			}
 		}
 
@@ -362,6 +372,143 @@ public class NondetModelChecker extends StateModelChecker
 		return probs;
 	}
 
+	// LTL-like path formula for P operator
+
+	protected StateProbs checkProbPathFormulaLTL(Expression expr, boolean qual, boolean min) throws PrismException
+	{
+		StateProbs probs = null;
+		Expression ltl;
+		Vector<JDDNode> labelDDs;
+		DRA dra;
+		JDDNode draDD, product;
+		JDDVars draDDRowVars, draDDColVars;
+		long l;
+		int i, j, n;
+		
+		// Model check maximal state formulas
+		labelDDs = new Vector<JDDNode>();
+		ltl = checkMaximalStateFormulas(expr.deepCopy(), labelDDs);
+		System.out.println(ltl);
+		
+		// Convert LTL formula to deterministic Rabin automaton (DRA)
+		mainLog.println("\nBuilding deterministic Rabin automaton...");
+		l = System.currentTimeMillis();
+		dra = LTL2Rabin.ltl2rabin(ltl.convertForJltl2ba());
+		mainLog.println("\nDRA has "+dra.size()+" states.");
+		//dra.print(System.out);
+		l = System.currentTimeMillis() - l;
+		mainLog.println("\nTime for Rabin translation: " + l/1000.0 + " seconds.");
+		
+		draDDRowVars = new JDDVars();
+		draDDColVars = new JDDVars();
+		n = (int)Math.ceil(PrismUtils.log2(dra.size()));
+		j = 1000;
+		for (i = 0; i < n; i++) {
+			draDDRowVars.addVar(JDD.Var(j++));
+			draDDColVars.addVar(JDD.Var(j++));
+		}
+		draDD = convertDRAToBDD(dra, labelDDs, draDDRowVars, draDDColVars);
+		JDD.Ref(trans);
+		product = JDD.Apply(JDD.TIMES, trans, draDD);
+		
+		mainLog.println("Model-DRA product: " + JDD.GetInfoString(product, model.getNumDDVarsInTrans()+n));
+		
+		if (probs == null)
+			throw new PrismException("Yikes"); // TODO
+
+		return probs;
+	}
+	
+	/* Extract maximal state formula from an LTL path formula, model check them
+	 * and replace them with ExpressionLabel objects L0, L1, etc.
+	 * As an optimisation, model checking that results in true/false for
+	 * all states is converted to an actual true/false.
+	 */
+	private Expression checkMaximalStateFormulas(Expression expr, Vector<JDDNode> labelDDs) throws PrismException
+	{
+		// A state formula
+		if (expr.getType() == Expression.BOOLEAN) {
+			// Model check
+			JDDNode dd = checkExpressionDD(expr);
+			// Detect special cases (true, false) for optimisation
+			if (dd.equals(JDD.ZERO)) {
+				return Expression.False();
+			}
+			if (dd.equals(reach)) {
+				return Expression.True();
+			}
+			// See if we already have an identical result
+			// (in which case, reuse it)
+			int i = labelDDs.indexOf(dd);
+			if (i != -1) return new ExpressionLabel("L"+i);
+			// Otherwise, add result to list, return new label 
+			labelDDs.add(dd);
+			return new ExpressionLabel("L"+(labelDDs.size()-1));
+		}
+		// A path formula (recurse, modify, return)
+		else if (expr.getType() == Expression.PATH_BOOLEAN) {
+			if (expr instanceof ExpressionBinaryOp) {
+				ExpressionBinaryOp exprBinOp = (ExpressionBinaryOp)expr;
+				exprBinOp.setOperand1(checkMaximalStateFormulas(exprBinOp.getOperand1(), labelDDs));
+				exprBinOp.setOperand2(checkMaximalStateFormulas(exprBinOp.getOperand2(), labelDDs));
+			}
+			else if (expr instanceof ExpressionUnaryOp) {
+				ExpressionUnaryOp exprUnOp = (ExpressionUnaryOp)expr;
+				exprUnOp.setOperand(checkMaximalStateFormulas(exprUnOp.getOperand(), labelDDs));
+			}
+			else if (expr instanceof ExpressionTemporal) {
+				ExpressionTemporal exprTemp = (ExpressionTemporal)expr;
+				if (exprTemp.getOperand1() != null) {
+					exprTemp.setOperand1(checkMaximalStateFormulas(exprTemp.getOperand1(), labelDDs));
+				}
+				if (exprTemp.getOperand2() != null) {
+					exprTemp.setOperand2(checkMaximalStateFormulas(exprTemp.getOperand2(), labelDDs));
+				}
+			}
+		}
+		return expr;
+	}
+	
+	private JDDNode convertDRAToBDD(DRA dra, Vector<JDDNode> labelDDs, JDDVars draDDRowVars, JDDVars draDDColVars)
+	{
+		JDDNode draMask;
+		Iterator<DA_State> it;
+		DA_State state;
+		JDDNode label, exprBDD, transition;
+		int i, n;
+		
+		draMask = JDD.Constant(0);
+		// Iterate through all (states and) transitions of DRA
+		for (it = dra.iterator(); it.hasNext(); ) {
+			state = it.next();
+			for (Map.Entry<APElement, DA_State> edge : state.edges().entrySet()) {
+				// Build a transition label BDD for each edge
+				mainLog.println(state.getName() + " to " + edge.getValue().getName() + " through " + edge.getKey().toString(dra.getAPSet(), false));
+				label = JDD.Constant(1);
+				n = dra.getAPSize();
+				for (i = 0; i < n; i++) {
+					// Get the expression BDD for label i
+					exprBDD = labelDDs.get(Integer.parseInt(dra.getAPSet().getAP(i).substring(1)));
+					JDD.Ref(exprBDD);
+					if (!edge.getKey().get(i)) {
+						exprBDD = JDD.Not(exprBDD);
+					}
+					label = JDD.And(label, exprBDD);
+				}
+				// Switch label BDD to col vars
+				label = JDD.PermuteVariables(label, allDDRowVars, allDDColVars);
+				// Build a BDD for the edge
+				transition = JDD.SetMatrixElement(JDD.Constant(0), draDDRowVars, draDDColVars, state.getName(), edge.getValue().getName(), 1);
+				// Now get the conjunction of the two
+				transition = JDD.And(transition, label);
+				// Add edge BDD to the DRA transition mask
+				draMask = JDD.Or(draMask, transition);
+			}
+		}
+		
+		return draMask;
+	}
+	
 	// next
 
 	protected StateProbs checkProbNext(ExpressionTemporal expr, boolean min) throws PrismException
@@ -369,10 +516,6 @@ public class NondetModelChecker extends StateModelChecker
 		JDDNode b;
 		StateProbs probs = null;
 
-		// check not LTL
-		if (expr.getOperand2().getType() != Expression.BOOLEAN)
-			throw new PrismException("Invalid path formula");
-
 		// model check operand first
 		b = checkExpressionDD(expr.getOperand2());
 
@@ -397,12 +540,6 @@ public class NondetModelChecker extends StateModelChecker
 		JDDNode b1, b2;
 		StateProbs probs = null;
 
-		// check not LTL
-		if (expr.getOperand1().getType() != Expression.BOOLEAN)
-			throw new PrismException("Invalid path formula");
-		if (expr.getOperand2().getType() != Expression.BOOLEAN)
-			throw new PrismException("Invalid path formula");
-
 		// get info from bounded until
 		time = expr.getUpperBound().evaluateInt(constantValues, null);
 		if (time < 0) {
@@ -456,12 +593,6 @@ public class NondetModelChecker extends StateModelChecker
 		StateProbs probs = null;
 		long l;
 
-		// check not LTL
-		if (expr.getOperand1().getType() != Expression.BOOLEAN)
-			throw new PrismException("Invalid path formula");
-		if (expr.getOperand2().getType() != Expression.BOOLEAN)
-			throw new PrismException("Invalid path formula");
-
 		// model check operands first
 		b1 = checkExpressionDD(expr.getOperand1());
 		try {

prism/src/prism/ProbModel.java

@@ -35,132 +35,350 @@ import mtbdd.*;
 import parser.*;
 import sparse.*;
 
-// class to store an instance of a fully probabilistic model (mtbdds)
-
+/*
+ * Class to store a PRISM model which is a DTMC
+ */
 public class ProbModel implements Model
 {
 	// model info
 
-	// type
-	private static final String type = "Probabilistic (DTMC)";
 	// modules
-	private int numModules;				// number of modules
-	private String[] moduleNames;		// module names
+	protected int numModules; // number of modules
+	protected String[] moduleNames; // module names
 	// vars/consts
-	private int numVars;				// total number of module variables
-	private VarList varList;			// list of module variables
-	private long[] gtol;				// numbers for use by globalToLocal
-	private Values constantValues;		// values of constants
+	protected int numVars; // total number of module variables
+	protected VarList varList; // list of module variables
+	protected long[] gtol; // numbers for use by globalToLocal
+	protected Values constantValues; // values of constants
 	// rewards
-	private int numRewardStructs;		// number of reward structs
-	private String[] rewardStructNames;	// reward struct names
+	protected int numRewardStructs; // number of reward structs
+	protected String[] rewardStructNames; // reward struct names
 	// stats
-	private double numStates;			// number of states
-	private double numTransitions;		// number of transitions
-	private double numStartStates;		// number of initial states
+	protected double numStates; // number of states
+	protected double numTransitions; // number of transitions
+	protected double numStartStates; // number of initial states
 	// reachable state list
-	private StateListMTBDD reachStateList = null;
+	protected StateListMTBDD reachStateList = null;
 	// deadlock state list
-	private StateListMTBDD deadlockStateList = null;
+	protected StateListMTBDD deadlockStateList = null;
 	// initial state list
-	private StateListMTBDD startStateList = null;
+	protected StateListMTBDD startStateList = null;
 
 	// mtbdd stuff
 
 	// dds
 
-	private JDDNode trans;			// transition matrix dd
-	private JDDNode trans01;		// 0-1 transition matrix dd
-	private JDDNode start;			// start state dd
-	private JDDNode reach;			// reachable states dd
-	private JDDNode deadlocks;		// deadlock states dd
-	private JDDNode fixdl;			// fixed deadlock states dd
-	private JDDNode stateRewards[];	// state rewards dds
-	private JDDNode transRewards[];	// transition rewards dds
+	protected JDDNode trans; // transition matrix dd
+	protected JDDNode trans01; // 0-1 transition matrix dd
+	protected JDDNode start; // start state dd
+	protected JDDNode reach; // reachable states dd
+	protected JDDNode deadlocks; // deadlock states dd
+	protected JDDNode fixdl; // fixed deadlock states dd
+	protected JDDNode stateRewards[]; // state rewards dds
+	protected JDDNode transRewards[]; // transition rewards dds
 	// dd vars
-	private JDDVars[] varDDRowVars;		// dd vars for each module variable (rows)
-	private JDDVars[] varDDColVars;		// dd vars for each module variable (cols)
-	private JDDVars[] moduleDDRowVars;	// dd vars for each module (rows)
-	private JDDVars[] moduleDDColVars;	// dd vars for each module (cols)
-	private JDDVars allDDRowVars;		// all dd vars (rows)
-	private JDDVars allDDColVars;		// all dd vars (cols)
+	protected JDDVars[] varDDRowVars; // dd vars for each module variable (rows)
+	protected JDDVars[] varDDColVars; // dd vars for each module variable (cols)
+	protected JDDVars[] moduleDDRowVars; // dd vars for each module (rows)
+	protected JDDVars[] moduleDDColVars; // dd vars for each module (cols)
+	protected JDDVars allDDRowVars; // all dd vars (rows)
+	protected JDDVars allDDColVars; // all dd vars (cols)
 	// names for all dd vars used
-	private Vector ddVarNames;
+	protected Vector ddVarNames;
 
-	private ODDNode odd;			// odd
+	protected ODDNode odd; // odd
 
 	// accessor methods
 
 	// model info
 
 	// type
-	public String getType()				{ return type; }
+	public int getType()
+	{
+		return Model.DTMC;
+	}
+
+	public String getTypeString()
+	{
+		return "Probabilistic (DTMC)"; // TODO: Change this after regression testing
+		//return "DTMC";
+	}
+
 	// modules
-	public int getNumModules()			{ return numModules; }
-	public String[] getModuleNames()		{ return moduleNames; }
-	public String getModuleName(int i)		{ return moduleNames[i]; }
+	public int getNumModules()
+	{
+		return numModules;
+	}
+
+	public String[] getModuleNames()
+	{
+		return moduleNames;
+	}
+
+	public String getModuleName(int i)
+	{
+		return moduleNames[i];
+	}
+
 	// vars
-	public int getNumVars()				{ return numVars; }
-	public VarList getVarList()			{ return varList; }
-	public String getVarName(int i)			{ return varList.getName(i); }
-	public int getVarIndex(String n)		{ return varList.getIndex(n); }
-	public int getVarModule(int i)			{ return varList.getModule(i); }
-	public int getVarLow(int i)			{ return varList.getLow(i); }
-	public int getVarHigh(int i)			{ return varList.getHigh(i); }
-	public int getVarRange(int i)			{ return varList.getRange(i); }
-	public Values getConstantValues()		{ return constantValues; }
+	public int getNumVars()
+	{
+		return numVars;
+	}
+
+	public VarList getVarList()
+	{
+		return varList;
+	}
+
+	public String getVarName(int i)
+	{
+		return varList.getName(i);
+	}
+
+	public int getVarIndex(String n)
+	{
+		return varList.getIndex(n);
+	}
+
+	public int getVarModule(int i)
+	{
+		return varList.getModule(i);
+	}
+
+	public int getVarLow(int i)
+	{
+		return varList.getLow(i);
+	}
+
+	public int getVarHigh(int i)
+	{
+		return varList.getHigh(i);
+	}
+
+	public int getVarRange(int i)
+	{
+		return varList.getRange(i);
+	}
+
+	public Values getConstantValues()
+	{
+		return constantValues;
+	}
+
 	// rewards
-	public int getNumRewardStructs()		{ return numRewardStructs; }
+	public int getNumRewardStructs()
+	{
+		return numRewardStructs;
+	}
+
 	// stats
-	public long getNumStates()			{ return (numStates>Long.MAX_VALUE) ? -1 : Math.round(numStates); }
-	public long getNumTransitions()			{ return (numTransitions>Long.MAX_VALUE) ? -1 : Math.round(numTransitions); }
-	public long getNumStartStates()			{ return (numStartStates>Long.MAX_VALUE) ? -1 : Math.round(numStartStates); }
+	public long getNumStates()
+	{
+		return (numStates > Long.MAX_VALUE) ? -1 : Math.round(numStates);
+	}
+
+	public long getNumTransitions()
+	{
+		return (numTransitions > Long.MAX_VALUE) ? -1 : Math.round(numTransitions);
+	}
+
+	public long getNumStartStates()
+	{
+		return (numStartStates > Long.MAX_VALUE) ? -1 : Math.round(numStartStates);
+	}
+
 	// additional methods to get stats as strings
-	public String getNumStatesString()		{ return PrismUtils.bigIntToString(numStates); }
-	public String getNumTransitionsString()		{ return PrismUtils.bigIntToString(numTransitions); }
-	public String getNumStartStatesString()		{ return PrismUtils.bigIntToString(numStartStates); }
+	public String getNumStatesString()
+	{
+		return PrismUtils.bigIntToString(numStates);
+	}
+
+	public String getNumTransitionsString()
+	{
+		return PrismUtils.bigIntToString(numTransitions);
+	}
+
+	public String getNumStartStatesString()
+	{
+		return PrismUtils.bigIntToString(numStartStates);
+	}
+
 	// lists of states
-	public StateList getReachableStates()		{ return reachStateList; }
-	public StateList getDeadlockStates()		{ return deadlockStateList; }
-	public StateList getStartStates()		{ return startStateList; }
+	public StateList getReachableStates()
+	{
+		return reachStateList;
+	}
+
+	public StateList getDeadlockStates()
+	{
+		return deadlockStateList;
+	}
+
+	public StateList getStartStates()
+	{
+		return startStateList;
+	}
 
 	// mtbdd stuff
 
-	public JDDNode getTrans()			{ return trans; }
-	public JDDNode getTrans01()			{ return trans01; }
-	public JDDNode getStart()			{ return start; }
-	public JDDNode getReach()		 	{ return reach; }
-	public JDDNode getDeadlocks()		 	{ return deadlocks; }
-	public JDDNode getFixedDeadlocks()		 	{ return fixdl; }
-	public JDDNode getStateRewards()			{ return getStateRewards(0); }
-	public JDDNode getStateRewards(int i)		{ return (i>=0&&i<numRewardStructs) ? stateRewards[i] : null; }
-	public JDDNode getStateRewards(String s)	{ for (int i=0;i<numRewardStructs;i++) if (rewardStructNames[i].equals(s)) return stateRewards[i]; return null; }
-	public JDDNode getTransRewards()			{ return getTransRewards(0); }
-	public JDDNode getTransRewards(int i)		{ return (i>=0&&i<numRewardStructs) ? transRewards[i] : null; }
-	public JDDNode getTransRewards(String s)	{ for (int i=0;i<numRewardStructs;i++) if (rewardStructNames[i].equals(s)) return transRewards[i]; return null; }
+	public JDDNode getTrans()
+	{
+		return trans;
+	}
+
+	public JDDNode getTrans01()
+	{
+		return trans01;
+	}
+
+	public JDDNode getStart()
+	{
+		return start;
+	}
+
+	public JDDNode getReach()
+	{
+		return reach;
+	}
+
+	public JDDNode getDeadlocks()
+	{
+		return deadlocks;
+	}
+
+	public JDDNode getFixedDeadlocks()
+	{
+		return fixdl;
+	}
+
+	public JDDNode getStateRewards()
+	{
+		return getStateRewards(0);
+	}
+
+	public JDDNode getStateRewards(int i)
+	{
+		return (i >= 0 && i < numRewardStructs) ? stateRewards[i] : null;
+	}
+
+	public JDDNode getStateRewards(String s)
+	{
+		for (int i = 0; i < numRewardStructs; i++)
+			if (rewardStructNames[i].equals(s))
+				return stateRewards[i];
+		return null;
+	}
+
+	public JDDNode getTransRewards()
+	{
+		return getTransRewards(0);
+	}
+
+	public JDDNode getTransRewards(int i)
+	{
+		return (i >= 0 && i < numRewardStructs) ? transRewards[i] : null;
+	}
+
+	public JDDNode getTransRewards(String s)
+	{
+		for (int i = 0; i < numRewardStructs; i++)
+			if (rewardStructNames[i].equals(s))
+				return transRewards[i];
+		return null;
+	}
+
 	// dd vars
-	public JDDVars[] getVarDDRowVars()		{ return varDDRowVars; }
-	public JDDVars[] getVarDDColVars()		{ return varDDColVars; }
-	public JDDVars getVarDDRowVars(int i)		{ return varDDRowVars[i]; }
-	public JDDVars getVarDDColVars(int i)		{ return varDDColVars[i]; }
-	public JDDVars[] getModuleDDRowVars()		{ return moduleDDRowVars; }
-	public JDDVars[] getModuleDDColVars()		{ return moduleDDColVars; }
-	public JDDVars getModuleDDRowVars(int i)	{ return moduleDDRowVars[i]; }
-	public JDDVars getModuleDDColVars(int i)	{ return moduleDDColVars[i]; }
-	public JDDVars getAllDDRowVars()		{ return allDDRowVars; }
-	public JDDVars getAllDDColVars()		{ return allDDColVars; }
+	public JDDVars[] getVarDDRowVars()
+	{
+		return varDDRowVars;
+	}
+
+	public JDDVars[] getVarDDColVars()
+	{
+		return varDDColVars;
+	}
+
+	public JDDVars getVarDDRowVars(int i)
+	{
+		return varDDRowVars[i];
+	}
+
+	public JDDVars getVarDDColVars(int i)
+	{
+		return varDDColVars[i];
+	}
+
+	public JDDVars[] getModuleDDRowVars()
+	{
+		return moduleDDRowVars;
+	}
+
+	public JDDVars[] getModuleDDColVars()
+	{
+		return moduleDDColVars;
+	}
+
+	public JDDVars getModuleDDRowVars(int i)
+	{
+		return moduleDDRowVars[i];
+	}
+
+	public JDDVars getModuleDDColVars(int i)
+	{
+		return moduleDDColVars[i];
+	}
+
+	public JDDVars getAllDDRowVars()
+	{
+		return allDDRowVars;
+	}
+
+	public JDDVars getAllDDColVars()
+	{
+		return allDDColVars;
+	}
+
 	// additional useful methods to do with dd vars
-	public int getNumDDRowVars()			{ return allDDRowVars.n(); }
-	public int getNumDDColVars()			{ return allDDColVars.n(); }
-	public int getNumDDVarsInTrans()		{ return allDDRowVars.n()*2; }
-	public Vector getDDVarNames()			{ return ddVarNames; }
+	public int getNumDDRowVars()
+	{
+		return allDDRowVars.n();
+	}
 
-	public ODDNode getODD()				{ return odd; }
+	public int getNumDDColVars()
+	{
+		return allDDColVars.n();
+	}
+
+	public int getNumDDVarsInTrans()
+	{
+		return allDDRowVars.n() * 2;
+	}
+
+	public Vector getDDVarNames()
+	{
+		return ddVarNames;
+	}
+
+	public ODDNode getODD()
+	{
+		return odd;
+	}
+	
+	public String getTransName()
+	{
+		return "Transition matrix"; 
+	}
+	
+	public String getTransSymbol()
+	{
+		return "P";
+	}
 	
 	// constructor
 
-	public ProbModel(JDDNode tr, JDDNode tr01, JDDNode s, JDDNode r, JDDNode dl, JDDNode sr[], JDDNode trr[], String rsn[], JDDVars arv, JDDVars acv, Vector ddvn,
-			      int nm, String[] mn, JDDVars[] mrv, JDDVars[] mcv,
+	public ProbModel(JDDNode tr, JDDNode tr01, JDDNode s, JDDNode r, JDDNode dl, JDDNode sr[], JDDNode trr[],
+			String rsn[], JDDVars arv, JDDVars acv, Vector ddvn, int nm, String[] mn, JDDVars[] mrv, JDDVars[] mcv,
 			int nv, VarList vl, JDDVars[] vrv, JDDVars[] vcv, Values cv)
 	{
 		int i;
@@ -193,8 +411,8 @@ public class ProbModel implements Model
 		for (i = 0; i < numVars; i++) {
 			gtol[i] = 1l << (varDDRowVars[i].getNumVars());
 		}
-		for (i = numVars-2; i >= 0; i--) {
-			gtol[i] = gtol[i] * gtol[i+1];
+		for (i = numVars - 2; i >= 0; i--) {
+			gtol[i] = gtol[i] * gtol[i + 1];
 		}
 
 		// work out number of states
@@ -202,7 +420,7 @@ public class ProbModel implements Model
 		numStartStates = JDD.GetNumMinterms(start, allDDRowVars.n());
 
 		// work out number of transitions
-		numTransitions = JDD.GetNumMinterms(trans01, allDDRowVars.n()*2);		
+		numTransitions = JDD.GetNumMinterms(trans01, getNumDDVarsInTrans());
 
 		// build odd
 		odd = ODDUtils.BuildODD(reach, allDDRowVars);
@@ -240,15 +458,19 @@ public class ProbModel implements Model
 
 	public void printTrans()
 	{
-//		JDD.PrintMatrix(trans, allDDRowVars, allDDColVars);
+		//		JDD.PrintMatrix(trans, allDDRowVars, allDDColVars);
 	}
 
 	public void printTrans01()
 	{
-//		JDD.PrintMatrix(trans01, allDDRowVars, allDDColVars, JDD.ZERO_ONE);
+		//		JDD.PrintMatrix(trans01, allDDRowVars, allDDColVars, JDD.ZERO_ONE);
+	}
+
+	public void printTransInfo(PrismLog log)
+	{
+		printTransInfo(log, false);
 	}
 
-	public void printTransInfo(PrismLog log) { printTransInfo(log, false); }
 	public void printTransInfo(PrismLog log, boolean extra)
 	{
 		int i, j, n;
@@ -258,44 +480,46 @@ public class ProbModel implements Model
 
 		log.println();
 
-		log.print("Transition matrix: ");
-		log.print(JDD.GetNumNodes(trans) + " nodes (");
-		log.print(JDD.GetNumTerminals(trans) + " terminal), ");
-		log.print(JDD.GetNumMintermsString(trans, getNumDDVarsInTrans()) + " minterms, ");
-		log.print("vars: " + getNumDDRowVars() + "r/" + getNumDDColVars() + "c\n");
+		log.print(getTransName() + ": " + JDD.GetInfoString(trans, getNumDDVarsInTrans()));
+		log.print(", vars: " + getNumDDRowVars() + "r/" + getNumDDColVars() + "c\n");
 		if (extra) {
 			log.print("DD vars (r/c):");
 			n = allDDRowVars.getNumVars();
 			for (i = 0; i < n; i++) {
 				j = allDDRowVars.getVarIndex(i);
-				log.print(" "+j+":"+ddVarNames.get(j));
+				log.print(" " + j + ":" + ddVarNames.get(j));
 				j = allDDColVars.getVarIndex(i);
-				log.print(" "+j+":"+ddVarNames.get(j));
+				log.print(" " + j + ":" + ddVarNames.get(j));
 			}
 			log.println();
-			log.print("Transition matrix terminals: " + JDD.GetTerminalsAndNumbersString(trans, getNumDDVarsInTrans())+"\n");
+			log.print(getTransName() + " terminals: " + JDD.GetTerminalsAndNumbersString(trans, getNumDDVarsInTrans())
+					+ "\n");
 			log.print("Reach: " + JDD.GetNumNodes(reach) + " nodes\n");
 			log.print("ODD: " + ODDUtils.GetNumODDNodes() + " nodes\n");
 		}
 		for (i = 0; i < numRewardStructs; i++) {
 			if (stateRewards[i] != null && !stateRewards[i].equals(JDD.ZERO)) {
-				log.print("State rewards ("+(i+1)+(("".equals(rewardStructNames[i]))?"":(":\""+rewardStructNames[i]+"\""))+"): ");
+				log.print("State rewards (" + (i + 1)
+						+ (("".equals(rewardStructNames[i])) ? "" : (":\"" + rewardStructNames[i] + "\"")) + "): ");
 				log.print(JDD.GetNumNodes(stateRewards[i]) + " nodes (");
 				log.print(JDD.GetNumTerminals(stateRewards[i]) + " terminal), ");
 				log.print(JDD.GetNumMintermsString(stateRewards[i], getNumDDRowVars()) + " minterms\n");
 				if (extra) {
-					log.print("State rewards terminals ("+(i+1)+(("".equals(rewardStructNames[i]))?"":(":\""+rewardStructNames[i]+"\""))+"): ");
-					log.print(JDD.GetTerminalsAndNumbersString(stateRewards[i], getNumDDRowVars())+"\n");
+					log.print("State rewards terminals (" + (i + 1)
+							+ (("".equals(rewardStructNames[i])) ? "" : (":\"" + rewardStructNames[i] + "\"")) + "): ");
+					log.print(JDD.GetTerminalsAndNumbersString(stateRewards[i], getNumDDRowVars()) + "\n");
 				}
 			}
 			if (transRewards[i] != null && !transRewards[i].equals(JDD.ZERO)) {
-				log.print("Transition rewards ("+(i+1)+(("".equals(rewardStructNames[i]))?"":(":\""+rewardStructNames[i]+"\""))+"): ");
+				log.print("Transition rewards (" + (i + 1)
+						+ (("".equals(rewardStructNames[i])) ? "" : (":\"" + rewardStructNames[i] + "\"")) + "): ");
 				log.print(JDD.GetNumNodes(transRewards[i]) + " nodes (");
 				log.print(JDD.GetNumTerminals(transRewards[i]) + " terminal), ");
 				log.print(JDD.GetNumMintermsString(transRewards[i], getNumDDVarsInTrans()) + " minterms\n");
 				if (extra) {
-					log.print("Transition rewards terminals ("+(i+1)+(("".equals(rewardStructNames[i]))?"":(":\""+rewardStructNames[i]+"\""))+"): ");
-					log.print(JDD.GetTerminalsAndNumbersString(transRewards[i], getNumDDVarsInTrans())+"\n");
+					log.print("Transition rewards terminals (" + (i + 1)
+							+ (("".equals(rewardStructNames[i])) ? "" : (":\"" + rewardStructNames[i] + "\"")) + "): ");
+					log.print(JDD.GetTerminalsAndNumbersString(transRewards[i], getNumDDVarsInTrans()) + "\n");
 				}
 			}
 		}
@@ -306,10 +530,11 @@ public class ProbModel implements Model
 	public void exportToFile(int exportType, boolean explicit, File file) throws FileNotFoundException
 	{
 		if (!explicit) {
-			PrismMTBDD.ExportMatrix(trans, "P", allDDRowVars, allDDColVars, odd, exportType, (file != null)?file.getPath():null);
-		}
-		else {
-			PrismSparse.ExportMatrix(trans, "P", allDDRowVars, allDDColVars, odd, exportType, (file != null)?file.getPath():null);
+			PrismMTBDD.ExportMatrix(trans, getTransSymbol(), allDDRowVars, allDDColVars, odd, exportType, (file != null) ? file
+					.getPath() : null);
+		} else {
+			PrismSparse.ExportMatrix(trans, getTransSymbol(), allDDRowVars, allDDColVars, odd, exportType, (file != null) ? file
+					.getPath() : null);
 		}
 	}
 
@@ -319,43 +544,47 @@ public class ProbModel implements Model
 
 	public String exportStateRewardsToFile(int exportType, File file) throws FileNotFoundException, PrismException
 	{
-		if (numRewardStructs == 0) throw new PrismException("There are no state rewards to export");
+		if (numRewardStructs == 0)
+			throw new PrismException("There are no state rewards to export");
 		int i;
 		String filename, allFilenames = "";
 		for (i = 0; i < numRewardStructs; i++) {
 			filename = (file != null) ? file.getPath() : null;
 			if (filename != null && numRewardStructs > 1) {
 				filename = PrismUtils.addCounterSuffixToFilename(filename, i);
-				allFilenames += ((i>0)?", ":"") + filename;
+				allFilenames += ((i > 0) ? ", " : "") + filename;
 			}
-			PrismMTBDD.ExportVector(stateRewards[i], "c"+i, allDDRowVars, odd, exportType, filename);
+			PrismMTBDD.ExportVector(stateRewards[i], "c" + i, allDDRowVars, odd, exportType, filename);
 		}
-		return (allFilenames.length()>0) ? allFilenames : null;
+		return (allFilenames.length() > 0) ? allFilenames : null;
 	}
 
 	// export transition rewards matrix to a file
 
 	// returns string containing files used if there were more than 1, null otherwise
 
-	public String exportTransRewardsToFile(int exportType, boolean explicit, File file) throws FileNotFoundException, PrismException
+	public String exportTransRewardsToFile(int exportType, boolean explicit, File file) throws FileNotFoundException,
+			PrismException
 	{
-		if (numRewardStructs == 0) throw new PrismException("There are no transition rewards to export");
+		if (numRewardStructs == 0)
+			throw new PrismException("There are no transition rewards to export");
 		int i;
 		String filename, allFilenames = "";
 		for (i = 0; i < numRewardStructs; i++) {
 			filename = (file != null) ? file.getPath() : null;
 			if (filename != null && numRewardStructs > 1) {
 				filename = PrismUtils.addCounterSuffixToFilename(filename, i);
-				allFilenames += ((i>0)?", ":"") + filename;
+				allFilenames += ((i > 0) ? ", " : "") + filename;
 			}
 			if (!explicit) {
-				PrismMTBDD.ExportMatrix(transRewards[i], "C"+i, allDDRowVars, allDDColVars, odd, exportType, filename);
+				PrismMTBDD
+						.ExportMatrix(transRewards[i], "C" + i, allDDRowVars, allDDColVars, odd, exportType, filename);
+			} else {
+				PrismSparse.ExportMatrix(transRewards[i], "C" + i, allDDRowVars, allDDColVars, odd, exportType,
+						filename);
 			}
-			else {
-				PrismSparse.ExportMatrix(transRewards[i], "C"+i, allDDRowVars, allDDColVars, odd, exportType, filename);
 		}
-		}
-		return (allFilenames.length()>0) ? allFilenames : null;
+		return (allFilenames.length() > 0) ? allFilenames : null;
 	}
 
 	// convert global state index to local indices
@@ -366,11 +595,11 @@ public class ProbModel implements Model
 		String s = "";
 
 		s += "(";
-		for (i = 0; i < numVars-1; i++) {
-			s += ((x/gtol[i+1]) + varList.getLow(i)) + ",";
-			x = x % gtol[i+1];
+		for (i = 0; i < numVars - 1; i++) {
+			s += ((x / gtol[i + 1]) + varList.getLow(i)) + ",";
+			x = x % gtol[i + 1];
 		}
-		s += (x + varList.getLow(numVars-1)) + ")";
+		s += (x + varList.getLow(numVars - 1)) + ")";
 
 		return s;
 	}
@@ -381,16 +610,15 @@ public class ProbModel implements Model
 	{
 		int i;
 
-		for (i = 0; i < numVars-1; i++) {
+		for (i = 0; i < numVars - 1; i++) {
 			if (i == l) {
-				return (int)((x/gtol[i+1]) + varList.getLow(i));
-			}
-			else {
-				x = x % gtol[i+1];
+				return (int) ((x / gtol[i + 1]) + varList.getLow(i));
+			} else {
+				x = x % gtol[i + 1];
 			}
 		}
 
-		return (int)(x + varList.getLow(numVars-1));
+		return (int) (x + varList.getLow(numVars - 1));
 	}
 
 	// clear up (deref all dds, dd vars)

prism/src/prism/StochModel.java

@@ -26,396 +26,45 @@
 
 package prism;
 
-import java.io.*;
 import java.util.Vector;
 
 import jdd.*;
-import odd.*;
-import mtbdd.*;
 import parser.*;
-import sparse.*;
 
-// class to store an instance of a stochastic model (ctmc)
-
-public class StochModel implements Model
+/*
+ * Class to store a PRISM model which is a CTMC
+ */
+public class StochModel extends ProbModel
 {
-	// model info
-	
-	// type
-	private static final String type = "Stochastic (CTMC)";
-	// modules
-	private int numModules;				// number of modules
-	private String[] moduleNames;		// module names
-	// vars/consts
-	private int numVars;				// total number of module variables
-	private VarList varList;			// list of module variables
-	private long[] gtol;				// numbers for use by globalToLocal
-	private Values constantValues;		// values of constants
-	// rewards
-	private int numRewardStructs;		// number of reward structs
-	private String[] rewardStructNames;	// reward struct names
-	// stats
-	private double numStates;			// number of states
-	private double numTransitions;		// number of transitions
-	private double numStartStates;		// number of initial states
-	// reachable state list
-	private StateListMTBDD reachStateList = null;
-	// deadlock state list
-	private StateListMTBDD deadlockStateList = null;
-	// initial state list
-	private StateListMTBDD startStateList = null;
-	
-	// mtbdd stuff
-	
-	// dds
-	private JDDNode trans;			// transition rate matrix dd
-	private JDDNode trans01;		// 0-1 transition matrix dd
-	private JDDNode start;			// start state dd
-	private JDDNode reach;			// reachable states dd
-	private JDDNode deadlocks;		// deadlock states dd
-	private JDDNode fixdl;			// fixed deadlock states dd
-	private JDDNode stateRewards[];	// state rewards dds
-	private JDDNode transRewards[];	// transition rewards dds
-	// dd vars
-	private JDDVars[] varDDRowVars;		// dd vars for each module variable (rows)
-	private JDDVars[] varDDColVars;		// dd vars for each module variable (cols)
-	private JDDVars[] moduleDDRowVars;	// dd vars for each module (rows)
-	private JDDVars[] moduleDDColVars;	// dd vars for each module (cols)
-	private JDDVars allDDRowVars;		// all dd vars (rows)
-	private JDDVars allDDColVars;		// all dd vars (cols)
-	// names for all dd vars used
-	private Vector ddVarNames;
-
-	private ODDNode odd;			// odd
-
 	// accessor methods
 
-	// model info
-	
-	// type
-	public String getType()				{ return type; }
-	// modules
-	public int getNumModules()			{ return numModules; }
-	public String[] getModuleNames()		{ return moduleNames; }
-	public String getModuleName(int i)		{ return moduleNames[i]; }
-	// vars
-	public int getNumVars()				{ return numVars; }
-	public VarList getVarList()			{ return varList; }
-	public String getVarName(int i)			{ return varList.getName(i); }
-	public int getVarIndex(String n)		{ return varList.getIndex(n); }
-	public int getVarModule(int i)			{ return varList.getModule(i); }
-	public int getVarLow(int i)			{ return varList.getLow(i); }
-	public int getVarHigh(int i)			{ return varList.getHigh(i); }
-	public int getVarRange(int i)			{ return varList.getRange(i); }
-	public Values getConstantValues()		{ return constantValues; }
-	// rewards
-	public int getNumRewardStructs()		{ return numRewardStructs; }
-	// stats
-	public long getNumStates()			{ return (numStates>Long.MAX_VALUE) ? -1 : Math.round(numStates); }
-	public long getNumTransitions()			{ return (numTransitions>Long.MAX_VALUE) ? -1 : Math.round(numTransitions); }
-	public long getNumStartStates()			{ return (numStartStates>Long.MAX_VALUE) ? -1 : Math.round(numStartStates); }
-	// additional methods to get stats as strings
-	public String getNumStatesString()		{ return PrismUtils.bigIntToString(numStates); }
-	public String getNumTransitionsString()		{ return PrismUtils.bigIntToString(numTransitions); }
-	public String getNumStartStatesString()		{ return PrismUtils.bigIntToString(numStartStates); }
-	// lists of states
-	public StateList getReachableStates()		{ return reachStateList; }
-	public StateList getDeadlockStates()		{ return deadlockStateList; }
-	public StateList getStartStates()		{ return startStateList; }
-	
-	// mtbdd stuff
-	
-	public JDDNode getTrans()			{ return trans; }
-	public JDDNode getTrans01()			{ return trans01; }
-	public JDDNode getStart()			{ return start; }
-	public JDDNode getReach()		 	{ return reach; }
-	public JDDNode getDeadlocks()		 	{ return deadlocks; }
-	public JDDNode getFixedDeadlocks()		 	{ return fixdl; }
-	public JDDNode getStateRewards()			{ return getStateRewards(0); }
-	public JDDNode getStateRewards(int i)		{ return (i>=0&&i<numRewardStructs) ? stateRewards[i] : null; }
-	public JDDNode getStateRewards(String s)	{ for (int i=0;i<numRewardStructs;i++) if (rewardStructNames[i].equals(s)) return stateRewards[i]; return null; }
-	public JDDNode getTransRewards()			{ return getTransRewards(0); }
-	public JDDNode getTransRewards(int i)		{ return (i>=0&&i<numRewardStructs) ? transRewards[i] : null; }
-	public JDDNode getTransRewards(String s)	{ for (int i=0;i<numRewardStructs;i++) if (rewardStructNames[i].equals(s)) return transRewards[i]; return null; }
-	// dd vars
-	public JDDVars[] getVarDDRowVars()		{ return varDDRowVars; }
-	public JDDVars[] getVarDDColVars()		{ return varDDColVars; }
-	public JDDVars getVarDDRowVars(int i)		{ return varDDRowVars[i]; }
-	public JDDVars getVarDDColVars(int i)		{ return varDDColVars[i]; }
-	public JDDVars[] getModuleDDRowVars()		{ return moduleDDRowVars; }
-	public JDDVars[] getModuleDDColVars()		{ return moduleDDColVars; }
-	public JDDVars getModuleDDRowVars(int i)	{ return moduleDDRowVars[i]; }
-	public JDDVars getModuleDDColVars(int i)	{ return moduleDDColVars[i]; }
-	public JDDVars getAllDDRowVars()		{ return allDDRowVars; }
-	public JDDVars getAllDDColVars()		{ return allDDColVars; }
-	// additional useful methods to do with dd vars
-	public int getNumDDRowVars()			{ return allDDRowVars.n(); }
-	public int getNumDDColVars()			{ return allDDColVars.n(); }
-	public int getNumDDVarsInTrans()		{ return allDDRowVars.n()*2; }
-	public Vector getDDVarNames()			{ return ddVarNames; }
-	
-	public ODDNode getODD()				{ return odd; }
-	
-	// constructor
-	
-	public StochModel(JDDNode tr, JDDNode tr01, JDDNode s, JDDNode r, JDDNode dl, JDDNode sr[], JDDNode trr[], String rsn[], JDDVars arv, JDDVars acv, Vector ddvn,
-			       int nm, String[] mn, JDDVars[] mrv, JDDVars[] mcv,
-			       int nv, VarList vl, JDDVars[] vrv, JDDVars[] vcv, Values cv)
-	{
-		int i;
-
-		trans = tr;
-		trans01 = tr01;
-		start = s;
-		reach = r;
-		deadlocks = dl;
-		fixdl = JDD.Constant(0);
-		stateRewards = sr;
-		transRewards = trr;
-		numRewardStructs = stateRewards.length; // which should == transRewards.length
-		rewardStructNames = rsn;
-		allDDRowVars = arv;
-		allDDColVars = acv;
-		ddVarNames = ddvn;
-		numModules = nm;
-		moduleNames = mn;
-		moduleDDRowVars = mrv;
-		moduleDDColVars = mcv;
-		numVars = nv;
-		varList = vl;
-		varDDRowVars = vrv;
-		varDDColVars = vcv;
-		constantValues = cv;
-		
-		// compute numbers for globalToLocal converter
-		gtol = new long[numVars];
-		for (i = 0; i < numVars; i++) {
-			gtol[i] = 1l << (varDDRowVars[i].getNumVars());
-		}
-		for (i = numVars-2; i >= 0; i--) {
-			gtol[i] = gtol[i] * gtol[i+1];
-		}
-		
-		// work out number of states
-		numStates = JDD.GetNumMinterms(reach, allDDRowVars.n());
-		numStartStates = JDD.GetNumMinterms(start, allDDRowVars.n());
-		
-		// work out number of transitions
-		numTransitions = JDD.GetNumMinterms(trans01, allDDRowVars.n()*2);		
-		
-		// build odd
-		odd = ODDUtils.BuildODD(reach, allDDRowVars);
-		
-		// store reachable states in a StateList
-		reachStateList = new StateListMTBDD(reach, this);
-		
-		// store deadlock states in a StateList
-		deadlockStateList = new StateListMTBDD(deadlocks, this);
-		
-		// store initial states in a StateList
-		startStateList = new StateListMTBDD(start, this);
-	}
-	
-	public void fixDeadlocks()
+	public int getType()
 	{
-		JDDNode tmp;
-		
-		if (!deadlocks.equals(JDD.ZERO)) {
-			// remove deadlocks by adding self-loops
-			JDD.Ref(deadlocks);
-			tmp = JDD.And(deadlocks, JDD.Identity(allDDRowVars, allDDColVars));
-			JDD.Ref(tmp);
-			trans = JDD.Apply(JDD.PLUS, trans, tmp);
-			trans01 = JDD.Apply(JDD.PLUS, trans01, tmp);
-			// update lists of deadlocks
-			JDD.Deref(fixdl);
-			fixdl = deadlocks;
-			deadlocks = JDD.Constant(0);
-			deadlockStateList = new StateListMTBDD(deadlocks, this);
-			// update model stats
-			numTransitions = JDD.GetNumMinterms(trans01, getNumDDVarsInTrans());		
-		}
+		return Model.CTMC;
 	}
 
-	public void printTrans()
+	public String getTypeString()
 	{
-//		JDD.PrintMatrix(trans, allDDRowVars, allDDColVars);
+		return "Stochastic (CTMC)"; // TODO: Change this after regression testing
+		//return "CTMC";
 	}
 
-	public void printTrans01()
+	public String getTransName()
 	{
-//		JDD.PrintMatrix(trans01, allDDRowVars, allDDColVars, JDD.ZERO_ONE);
+		return "Rate matrix"; 
 	}
 	
-	public void printTransInfo(PrismLog log) { printTransInfo(log, false); }
-	public void printTransInfo(PrismLog log, boolean extra)
+	public String getTransSymbol()
 	{
-		int i, j, n;
-		
-		log.print("States:      " + getNumStatesString() + " (" + getNumStartStatesString() + " initial)" + "\n");
-		log.print("Transitions: " + getNumTransitionsString() + "\n");
-		
-		log.println();
-		
-		log.print("Rate matrix: ");
-		log.print(JDD.GetNumNodes(trans) + " nodes (");
-		log.print(JDD.GetNumTerminals(trans) + " terminal), ");
-		log.print(JDD.GetNumMintermsString(trans, getNumDDVarsInTrans()) + " minterms, ");
-		log.print("vars: " + getNumDDRowVars() + "r/" + getNumDDColVars() + "c\n");
-		if (extra) {
-			log.print("DD vars (r/c):");
-			n = allDDRowVars.getNumVars();
-			for (i = 0; i < n; i++) {
-				j = allDDRowVars.getVarIndex(i);
-				log.print(" "+j+":"+ddVarNames.get(j));
-				j = allDDColVars.getVarIndex(i);
-				log.print(" "+j+":"+ddVarNames.get(j));
-			}
-			log.println();
-			log.print("Rate matrix terminals: " + JDD.GetTerminalsAndNumbersString(trans, getNumDDVarsInTrans())+"\n");
-			log.print("Reach: " + JDD.GetNumNodes(reach) + " nodes\n");
-			log.print("ODD: " + ODDUtils.GetNumODDNodes() + " nodes\n");
-		}
-		
-		for (i = 0; i < numRewardStructs; i++) {
-			if (stateRewards[i] != null && !stateRewards[i].equals(JDD.ZERO)) {
-				log.print("State rewards ("+(i+1)+(("".equals(rewardStructNames[i]))?"":(":\""+rewardStructNames[i]+"\""))+"): ");
-				log.print(JDD.GetNumNodes(stateRewards[i]) + " nodes (");
-				log.print(JDD.GetNumTerminals(stateRewards[i]) + " terminal), ");
-				log.print(JDD.GetNumMintermsString(stateRewards[i], getNumDDRowVars()) + " minterms\n");
-				if (extra) {
-					log.print("State rewards terminals ("+(i+1)+(("".equals(rewardStructNames[i]))?"":(":\""+rewardStructNames[i]+"\""))+"): ");
-					log.print(JDD.GetTerminalsAndNumbersString(stateRewards[i], getNumDDRowVars())+"\n");
-				}
-			}
-			if (transRewards[i] != null && !transRewards[i].equals(JDD.ZERO)) {
-				log.print("Transition rewards ("+(i+1)+(("".equals(rewardStructNames[i]))?"":(":\""+rewardStructNames[i]+"\""))+"): ");
-				log.print(JDD.GetNumNodes(transRewards[i]) + " nodes (");
-				log.print(JDD.GetNumTerminals(transRewards[i]) + " terminal), ");
-				log.print(JDD.GetNumMintermsString(transRewards[i], getNumDDVarsInTrans()) + " minterms\n");
-				if (extra) {
-					log.print("Transition rewards terminals ("+(i+1)+(("".equals(rewardStructNames[i]))?"":(":\""+rewardStructNames[i]+"\""))+"): ");
-					log.print(JDD.GetTerminalsAndNumbersString(transRewards[i], getNumDDVarsInTrans())+"\n");
-				}
-			}
-		}
+		return "R";
 	}
 	
-	// export transition matrix to a file
-	
-	public void exportToFile(int exportType, boolean explicit, File file) throws FileNotFoundException
-	{
-		if (!explicit) {
-			PrismMTBDD.ExportMatrix(trans, "R", allDDRowVars, allDDColVars, odd, exportType, (file != null)?file.getPath():null);
-		}
-		else {
-			PrismSparse.ExportMatrix(trans, "R", allDDRowVars, allDDColVars, odd, exportType, (file != null)?file.getPath():null);
-		}
-	}
-
-	// export state rewards vector to a file
-	
-	// returns string containing files used if there were more than 1, null otherwise
-	
-	public String exportStateRewardsToFile(int exportType, File file) throws FileNotFoundException, PrismException
-	{
-		if (numRewardStructs == 0) throw new PrismException("There are no state rewards to export");
-		int i;
-		String filename, allFilenames = "";
-		for (i = 0; i < numRewardStructs; i++) {
-			filename = (file != null) ? file.getPath() : null;
-			if (filename != null && numRewardStructs > 1) {
-				filename = PrismUtils.addCounterSuffixToFilename(filename, i);
-				allFilenames += ((i>0)?", ":"") + filename;
-			}
-			PrismMTBDD.ExportVector(stateRewards[i], "c"+i, allDDRowVars, odd, exportType, filename);
-		}
-		return (allFilenames.length()>0) ? allFilenames : null;
-	}
-
-	// export transition rewards matrix to a file
-	
-	// returns string containing files used if there were more than 1, null otherwise
-	
-	public String exportTransRewardsToFile(int exportType, boolean explicit, File file) throws FileNotFoundException, PrismException
-	{
-		if (numRewardStructs == 0) throw new PrismException("There are no transition rewards to export");
-		int i;
-		String filename, allFilenames = "";
-		for (i = 0; i < numRewardStructs; i++) {
-			filename = (file != null) ? file.getPath() : null;
-			if (filename != null && numRewardStructs > 1) {
-				filename = PrismUtils.addCounterSuffixToFilename(filename, i);
-				allFilenames += ((i>0)?", ":"") + filename;
-			}
-			if (!explicit) {
-				PrismMTBDD.ExportMatrix(transRewards[i], "C"+i, allDDRowVars, allDDColVars, odd, exportType, filename);
-			}
-			else {
-				PrismSparse.ExportMatrix(transRewards[i], "C"+i, allDDRowVars, allDDColVars, odd, exportType, filename);
-			}
-		}
-		return (allFilenames.length()>0) ? allFilenames : null;
-	}
-
-	// convert global state index to local indices
-	
-	public String globalToLocal(long x)
-	{
-		int i;
-		String s = "";
-		
-		s += "(";
-		for (i = 0; i < numVars-1; i++) {
-			s += ((x/gtol[i+1]) + varList.getLow(i)) + ",";
-			x = x % gtol[i+1];
-		}
-		s += (x + varList.getLow(numVars-1)) + ")";
-		
-		return s;
-	}
-	
-	// convert global state index to local index
-	
-	public int globalToLocal(long x, int l)
-	{
-		int i;
-		
-		for (i = 0; i < numVars-1; i++) {
-			if (i == l) {
-				return (int)((x/gtol[i+1]) + varList.getLow(i));
-			}
-			else {
-				x = x % gtol[i+1];
-			}
-		}
-		
-		return (int)(x + varList.getLow(numVars-1));
-	}
-	
-	// clear up (deref all dds, dd vars)
+	// constructor
 
-	public void clear()
+	public StochModel(JDDNode tr, JDDNode tr01, JDDNode s, JDDNode r, JDDNode dl, JDDNode sr[], JDDNode trr[],
+			String rsn[], JDDVars arv, JDDVars acv, Vector ddvn, int nm, String[] mn, JDDVars[] mrv, JDDVars[] mcv,
+			int nv, VarList vl, JDDVars[] vrv, JDDVars[] vcv, Values cv)
 	{
-		for (int i = 0; i < numVars; i++) {
-			varDDRowVars[i].derefAll();
-			varDDColVars[i].derefAll();
-		}
-		for (int i = 0; i < numModules; i++) {
-			moduleDDRowVars[i].derefAll();
-			moduleDDColVars[i].derefAll();
-		}
-		allDDRowVars.derefAll();
-		allDDColVars.derefAll();
-		JDD.Deref(trans);
-		JDD.Deref(trans01);
-		JDD.Deref(start);
-		JDD.Deref(reach);
-		JDD.Deref(deadlocks);
-		JDD.Deref(fixdl);
-		for (int i = 0; i < numRewardStructs; i++) {
-			JDD.Deref(stateRewards[i]);
-			JDD.Deref(transRewards[i]);
-		}
+		super(tr, tr01, s, r, dl, sr, trr, rsn, arv, acv, ddvn, nm, mn, mrv, mcv, nv, vl, vrv, vcv, cv);
 	}
 }