public bool AddDialogVariableAssignment(DialogVariableAssignment variableAssignment, DialogNodeType nodeType)
{
switch (variableAssignment.Operator)
{
case DialogVariableOperator.SetTo:
case DialogVariableOperator.SetToYes:
case DialogVariableOperator.SetToNo:
// Filter out all cases when variable assignment is not useful to simplify the code
if (VariablesValues.ContainsKey(variableAssignment.Variable) &&
VariablesValues[variableAssignment.Variable].Count == 1)
{
var previousValue = VariablesValues[variableAssignment.Variable][0];
// Case 1 : value not changed => variable assignment is not useful
if (previousValue == variableAssignment.Value)
{
return(false);
}
}
var values = new List <string>(1);
values.Add(variableAssignment.Value);
VariablesValues[variableAssignment.Variable] = values;
return(true);
case DialogVariableOperator.SetToBlank:
if (VariablesValues.ContainsKey(variableAssignment.Variable))
{
if (VariablesValues[variableAssignment.Variable].Count == 1 &&
entityVariablesNames.Contains(variableAssignment.VariableName))
{
var previousValue = VariablesValues[variableAssignment.Variable][0];
// Case 2 : the default behavior of FatHeadAnswer
// is to reset all entity variables not explicitly set => variable assignment is not useful
if (nodeType == DialogNodeType.FatHeadAnswers && (String.IsNullOrEmpty(previousValue) || previousValue.StartsWith("$(")))
{
return(VariableCouldHaveBeenSetByEntityMatchBefore(variableAssignment.VariableName));
}
// Case 3 : the default behavior of RedirectToLongTail / DirectAnswer
// is to reset all entity variables n=> variable assignment is not useful
else if ((nodeType == DialogNodeType.RedirectToLongTail || nodeType == DialogNodeType.DirectAnswer))
{
return(false);
}
}
VariablesValues.Remove(variableAssignment.Variable);
return(true);
}
else
{
return(VariableCouldHaveBeenSetByEntityMatchBefore(variableAssignment.VariableName));
}
case DialogVariableOperator.CopyValueFromVariable:
var fromVariable = Variables[variableAssignment.Value];
IList <string> fromValues = null;
VariablesValues.TryGetValue(fromVariable, out fromValues);
IList <string> toValues = null;
VariablesValues.TryGetValue(variableAssignment.Variable, out toValues);
if (fromValues == null)
{
if (toValues != null)
{
VariablesValues.Remove(variableAssignment.Variable);
}
}
else
{
VariablesValues[variableAssignment.Variable] = fromValues;
}
return(true);
default:
throw new Exception("Unexpected variable assignment operator " + variableAssignment.Operator);
}
}
public bool SetVariableValue(string variableName, string value, DialogNodeType nodeType)
{
return(AddDialogVariableAssignment(
new DialogVariableAssignment(Variables[variableName], DialogVariableOperator.SetTo, value), nodeType));
}