/**
* Compute the min/max probability, from the initial state, of reaching a set of target locations.
*/
private double computeProbabilisticReachability(BitSet targetLocs, boolean min)
throws PrismException {
// Determine which method to use for computation
String ptaMethod = prism.getSettings().getString(PrismSettings.PRISM_PTA_METHOD);
// Do probability computation through abstraction/refinement/stochastic games
if (ptaMethod.equals("Stochastic games")) {
PTAAbstractRefine ptaAR;
ptaAR = new PTAAbstractRefine();
String arOptions = prism.getSettings().getString(PrismSettings.PRISM_AR_OPTIONS);
ptaAR.setLog(mainLog);
ptaAR.parseOptions(arOptions.split(","));
return ptaAR.forwardsReachAbstractRefine(pta, targetLocs, null, min);
}
// Do probability computation by first constructing a bisimulation
else if (ptaMethod.equals("Bisimulation minimisation")) {
// Not supported yet
throw new PrismException("Not yet supported");
} else throw new PrismException("Unknown PTA solution method");
}
/** Constructor. */
public PTAModelChecker(Prism prism, ModulesFile modulesFile, PropertiesFile propertiesFile)
throws PrismException {
this.prism = prism;
mainLog = prism.getMainLog();
this.modulesFile = modulesFile;
this.propertiesFile = propertiesFile;
// Get combined constant values from model/properties
constantValues = new Values();
constantValues.addValues(modulesFile.getConstantValues());
if (propertiesFile != null) constantValues.addValues(propertiesFile.getConstantValues());
// Build a combined label list and expand any constants
// (note labels in model are ignored (removed) during PTA translation so need to store here)
labelList = new LabelList();
for (int i = 0; i < modulesFile.getLabelList().size(); i++) {
labelList.addLabel(
modulesFile.getLabelList().getLabelNameIdent(i),
modulesFile.getLabelList().getLabel(i).deepCopy());
}
for (int i = 0; i < propertiesFile.getLabelList().size(); i++) {
labelList.addLabel(
propertiesFile.getLabelList().getLabelNameIdent(i),
propertiesFile.getLabelList().getLabel(i).deepCopy());
}
labelList = (LabelList) labelList.replaceConstants(constantValues);
// Build mapping from all (original model) variables to non-clocks only
int numVars = modulesFile.getNumVars();
nonClockVarMap = new int[numVars];
int count = 0;
for (int i = 0; i < numVars; i++) {
if (modulesFile.getVarType(i) instanceof TypeClock) {
nonClockVarMap[i] = -1;
} else {
nonClockVarMap[i] = count++;
}
}
}
