public void Clear_field_path()
{
var aw = new AdventureWorks();
var path = new FieldPath(
aw.SalesOrderDetails["ProductID"],
aw.Products["ProductCategoryID"],
aw.ProductCategory.DefaultField);
path.Clear();
Assert.AreEqual(0, path.Count);
}
/// <summary>
/// Parse text containing placeholders for fields delimited by bracket.
/// The first stop delimits the subject.field, subsequent stops traverse relationships.
/// For example:
/// [Products.Name] is the "Products" subject, field "Name"
/// [Products.ProductCategoryID.Name] is the "Products" subject, field "ProductCategoryID" which is a RelationField to subject "Product Category" with a field "Name".
/// </summary>
/// <param name="subject"></param>
/// <param name="texts"></param>
/// <returns></returns>
public virtual Dictionary<string, IFieldPath> Parse(IConfiguration config, params string[] texts)
{
var fields = new Dictionary<string, IFieldPath>();
foreach (var t in texts)
{
var matches = Regex.Matches(t, @"\[((?<subject>[^\]\.]+)(\.([^\]\.]+))+)\]");
foreach (Match m in matches)
{
// represent the entire path as the key to the dictionary
if (!fields.ContainsKey(m.Groups[1].Value))
{
// now create the FieldPath based on the Regex
var path = new FieldPath();
var subject = config[m.Groups["subject"].Value];
if (subject != null)
{
foreach (Capture capture in m.Groups[3].Captures)
{
var field = subject[capture.Value];
if (field == null)
{
path.Clear();
break;
}
path.Add(field);
if (field is IRelationField)
subject = ((IRelationField)field).RelatedSubject;
}
if (path.Count > 0)
fields.Add(m.Groups[0].Value, path);
}
}
}
}
return fields;
}