private static IArgChecker CreateFromMethodCallExpression(MethodCallExpression expression)
{
if (expression.Method.IsGenericMethod && expression.Method.DeclaringType == ArgClassType)
{
var expressionGenericMethodDefinition = expression.Method.GetGenericMethodDefinition();
if (expressionGenericMethodDefinition == ArgAnyMethodInfo)
{
return(new AnyArgChecker());
}
if (expressionGenericMethodDefinition == ArgMatchMethodInfo)
{
var genericParameters = expression.Method.GetGenericArguments();
var typedMatchArgCheckerType = GenericMatchArgCheckerType.MakeGenericType(genericParameters);
var constructorArgument = ((UnaryExpression)expression.Arguments[0]).Operand;
var constructorArguments = new object[] { constructorArgument };
var matchArgChecker = (IArgChecker)Activator.CreateInstance(
typedMatchArgCheckerType,
constructorArguments);
return(matchArgChecker);
}
}
throw CaishenException.InvalidArgumentExpression();
}
public IArgChecker CreateArgChecker(Expression expression)
{
switch (expression)
{
case ConstantExpression constantExpression:
return(CreateFromConstantExpression(constantExpression));
case MethodCallExpression methodCallExpression:
return(CreateFromMethodCallExpression(methodCallExpression));
default:
throw CaishenException.InvalidArgumentExpression();
}
}
