public static IValueOf getStrategy(Expression expr)
{
IValueOf strategy = ValueOfConst.clone();
if (expr is MemberExpression)
{
MemberExpression member = (MemberExpression)expr;
if (member.Expression is MemberExpression) // expr là một property trong object
{
strategy = ValueOfObject.clone();
}
else if (member.Expression is ConstantExpression) // expr là một biến
{
strategy = ValueOfVariable.clone();
}
else
{
strategy = ValueOfDatetime.clone();
}
}
else if (expr is MethodCallExpression) // expr là 1 fuction
{
strategy = ValueOfMethod.clone();
}
else if (expr is UnaryExpression)
{
strategy = ValueOfUnary.clone();
}
return(strategy);
}
public static IValueOf clone()
{
if (value == null)
{
value = new ValueOfConst();
}
return(value);
}