private static QueryBuffer.TypeBuffer GetTypeBuffer(HarmonyTableExpression table, List <Tuple <HarmonyTableExpression, QueryBuffer.TypeBuffer> > flatList)
{
var queryTables = table.RootExpression.RootExpressions.Values.OfType <HarmonyTableExpression>().Where(qt => qt != table);
var made = new QueryBuffer.TypeBuffer
{
DataObjectType = table.ItemType,
IsCollection = table.IsCollection,
ParentFieldName = table.Name,
Metadata = DataObjectMetadataBase.LookupType(table.ItemType)
};
if (table.Top != null)
{
var bakedFunction = Expression.Lambda <Func <QueryContext, long> >(Expression.Convert(table.Top, typeof(long)), QueryCompilationContext.QueryContextParameter).Compile();
made.Top = (obj) => bakedFunction(obj as QueryContext);
}
if (table.Skip != null)
{
var bakedFunction = Expression.Lambda <Func <QueryContext, long> >(Expression.Convert(table.Skip, typeof(long)), QueryCompilationContext.QueryContextParameter).Compile();
made.Skip = (obj) => bakedFunction(obj as QueryContext);
}
if (made.Top != null || made.Skip != null)
{
made.SelectResult = CollectionFilterMethod.MakeGenericMethod(made.DataObjectType).CreateDelegate(typeof(Func <QueryBuffer, QueryBuffer.TypeBuffer, object, object>), null) as Func <QueryBuffer, QueryBuffer.TypeBuffer, object, object>;
}
flatList.Add(Tuple.Create(table, made));
var joinedBuffers = queryTables.OfType <HarmonyTableExpression>().Where(qt => !qt.Name.Contains(".")).Select(qt => GetTypeBuffer(qt, flatList)).ToList();
var namedLookup = joinedBuffers.ToDictionary(tb => tb.ParentFieldName);
foreach (var nestedTable in queryTables.OfType <HarmonyTableExpression>().Where(qt => qt.Name.Contains(".")).OrderBy(qt => qt.Name.Length))
{
var nameParts = nestedTable.Name.Split(".");
if (namedLookup.TryGetValue(string.Join(".", nameParts.Take(nameParts.Length - 1)), out var foundBuffer))
{
var fullName = nestedTable.Name;
nestedTable.Name = nameParts.Last();
var madeBuffer = GetTypeBuffer(nestedTable, flatList);
foundBuffer.JoinedBuffers.Add(madeBuffer);
namedLookup.Add(fullName, madeBuffer);
}
else
{
throw new Exception(string.Format("failed to find parent table while processing query {0}", nestedTable.Name));
}
}
made.JoinedBuffers = joinedBuffers;
return(made);
}
public static IList <string> GetPKFieldNames <T>(IEntityType entityType)
{
if (typeof(DataObjectBase).IsAssignableFrom(typeof(T)))
{
var metadata = DataObjectMetadataBase.LookupType(typeof(T));
var fields = metadata.GetKeyFields(0, KeyType.ISAMGenerated | KeyType.KeyFactorySupplied | KeyType.UserSupplied);
return(fields);
}
else
{
var primaryKey = entityType.FindPrimaryKey();
return(primaryKey.Properties.Select(prop => prop.Name).ToList());
}
}
