public ReturnValueClass getNextUIState()
{
//run the clips first
clipsEnvironment.Run();
ReturnValueClass returnValue = new ReturnValueClass();
// Get the state-list.
String evalStr = "(find-all-facts ((?f state-list)) TRUE)";
using (FactAddressValue allFacts = (FactAddressValue)((MultifieldValue)clipsEnvironment.Eval(evalStr))[0])
{
string currentID = allFacts.GetFactSlot("current").ToString();
evalStr = "(find-all-facts ((?f UI-state)) " +
"(eq ?f:id " + currentID + "))";
}
using (FactAddressValue evalFact = (FactAddressValue)((MultifieldValue)clipsEnvironment.Eval(evalStr))[0])
{
//get the state from clipse
string state = evalFact.GetFactSlot("state").ToString();
returnValue.State = state;
using (MultifieldValue validAnswers = (MultifieldValue)evalFact.GetFactSlot("valid-answers"))
{
for (int i = 0; i < validAnswers.Count; i++)
{
returnValue.validAnswers.Add((SymbolValue)validAnswers[i]);
}
}
returnValue.displayQuestion = GetString((SymbolValue)evalFact.GetFactSlot("display"));
}
return(returnValue);
}
/* call this method from the fron end.
* input = strButtonName = Next/Restart/Prev
* initialFlag = call this for the first time
* ChoiceOption = Yes / No
*/
public void HandleRequest(string strButtonName, bool initialFlag, string ChoiceOption)
{
ReturnValueClass returnValue = new ReturnValueClass();
String evalStr = "(find-all-facts ((?f state-list)) TRUE)";
using (FactAddressValue f = (FactAddressValue)((MultifieldValue)clipsEnvironment.Eval(evalStr))[0])
{
string currentID = f.GetFactSlot("current").ToString();
if (strButtonName.Equals("Next"))
{
if (initialFlag)
{
clipsEnvironment.AssertString("(next " + currentID + ")");
}
else
{
clipsEnvironment.AssertString("(next " + currentID + " " + ChoiceOption + ")");
}
returnValue = getNextUIState();
}
else if (strButtonName.Equals("Restart"))
{
clipsEnvironment.Reset();
returnValue = getNextUIState();
}
else if (strButtonName.Equals("Prev"))
{
clipsEnvironment.AssertString("(prev " + currentID + ")");
returnValue = getNextUIState();
}
}
}