private void ProcessOrderClause(LambdaExpression lambda, bool isAscending)
{
if ((lambda.Parameters.Count != 1) ||
(!(lambda.Parameters[0] is ParameterExpression)) ||
(!IsAWorkItem(lambda.Parameters[0].Type)))
{
throw new InvalidOperationException("invalid order clase");
}
Expression body = lambda.Body;
MemberExpression me = body as MemberExpression;
string fieldReference = null;
if (me != null)
{
fieldReference = FieldUtility.ExtractFieldReferenceName(me.Member);
if (fieldReference == null)
{
throw new InvalidOperationException("invalid order field");
}
_builder.AddOrderClause(fieldReference, isAscending);
return;
}
MethodCallExpression mc = body as MethodCallExpression;
if (mc != null)
{
fieldReference = FieldUtility.ExtractWIFieldFromMethodCall(mc);
if (fieldReference == null)
{
throw new InvalidOperationException("invalid order field");
}
_builder.AddOrderClause(fieldReference, isAscending);
}
}
protected override Expression VisitMethodCall(MethodCallExpression m)
{
if ((m.Object is ParameterExpression) && (m.Object.Type == typeof(WIT.WorkItem)))
{
if (CurrentLocation != WhereLocationEnum.LeftOperatorClause)
{
throw new InvalidOperationException("Methodcall");
}
string fieldReference = FieldUtility.ExtractWIFieldFromMethodCall(m);
if (fieldReference == null)
{
throw new NotSupportedException("MethodCall");
}
_builder.Append(fieldReference);
}
else if (CheckCustomOperatorCalls(m))
{
return(m);
}
else if (CheckCustomStaticOperatorCalls(m))
{
return(m);
}
//else if (CheckFieldExtensionMethodCall(m))
//{
// return m;
//}
else
{
MemberExpression me = m.Object as MemberExpression;
if ((me == null) ||
(!(me.Expression is ParameterExpression)) ||
(m.Arguments.Count != 1))
{
throw new NotSupportedException("MethodCall");
}
else
{
ConstantExpression constant = m.Arguments[0] as ConstantExpression;
string op = null;
if (me.Type == typeof(string))
{
if (m.Method.Name == "Contains")
{
op = "CONTAINS";
}
else if (m.Method.Name == "StartsWith")
{
op = "UNDER";
}
}
if (op == null)
{
throw new NotSupportedException("MethodCall");
}
PushLocation(WhereLocationEnum.LeftOperatorClause);
Visit(me);
PopLocation();
_builder.Append(" " + op + " ");
PushLocation(WhereLocationEnum.RightOperatorClause);
Visit(m.Arguments[0]);
PopLocation();
}
}
return(m);
}