public Func <Dictionary <string, object>, T> GetItemGetter <T>(int index)
{
IExpression itemExpr = Expressions[index];
Type itemType = typeof(T);
if (ReflectionHelper.IsNumber(itemType))
{
INumericExpression numericExpr = (INumericExpression)itemExpr;
Func <double, T> converter = ReflectionHelper.GenerateFromDoubleConverter <T>();
return(variables => converter(numericExpr.Evaluate(variables)));
}
else if (itemType == typeof(bool))
{
MethodInfo generateGetterMethod = GetType()
.GetMethod("GetBooleanItemGetter", BindingFlags.NonPublic | BindingFlags.Static);
Func <IBooleanExpression, Func <Dictionary <string, object>, T> > generateGetterDelegate =
ReflectionHelper.CreateDelegate <IBooleanExpression, Func <Dictionary <string, object>, T> >(generateGetterMethod);
IBooleanExpression booleanExpr = (IBooleanExpression)itemExpr;
return(generateGetterDelegate(booleanExpr));
}
else if (itemType == typeof(string))
{
MethodInfo generateGetterMethod = GetType()
.GetMethod("GetStringItemGetter", BindingFlags.NonPublic | BindingFlags.Static);
Func <IStringExpression, Func <Dictionary <string, object>, T> > generateGetterDelegate =
ReflectionHelper.CreateDelegate <IStringExpression, Func <Dictionary <string, object>, T> >(generateGetterMethod);
IStringExpression booleanExpr = (IStringExpression)itemExpr;
return(generateGetterDelegate(booleanExpr));
}
else
{
IObjectExpression objectExpr = (IObjectExpression)itemExpr;
return(variables => (T)objectExpr.GetInstance(variables));
}
}
public double Evaluate(Dictionary <string, object> variables)
{
object listInstance = listExpr.GetInstance(variables);
return(evaluator(listInstance, (int)indexExpr.Evaluate(variables)));
}
public double Evaluate(Dictionary <string, object> variables)
{
object instance = containingObject.GetInstance(variables);
return(evaluator(instance));
}