TObject ConstructObject(IReadOnlyDictionary <string, object?>?row, int?rowCount)
{
if (rowCount == 0 || row == null)
{
throw new MissingDataException($"No rows were returned. It was this expected, use `.ToObjectOrNull` instead of `.ToObject`.");
}
else if (rowCount > 1 && !m_RowOptions.HasFlag(RowOptions.DiscardExtraRows))
{
throw new UnexpectedDataException($"Expected 1 row but received {rowCount} rows. If this was expected, use `RowOptions.DiscardExtraRows`.");
}
return(MaterializerUtilities.ConstructObject <TObject>(row, Constructor, Converter));
}
TObject?ConstructObject(IReadOnlyDictionary <string, object?>?row, int?rowCount)
{
if (rowCount == 0 || row == null)
{
if (!m_RowOptions.HasFlag(RowOptions.PreventEmptyResults))
{
return(null);
}
else
{
throw new MissingDataException($"No rows were returned and {nameof(RowOptions)}.{nameof(RowOptions.PreventEmptyResults)} was enabled.");
}
}
else if (rowCount > 1 && !m_RowOptions.HasFlag(RowOptions.DiscardExtraRows))
{
throw new UnexpectedDataException($"Expected 1 row but received {rowCount} rows. If this was expected, use `RowOptions.DiscardExtraRows`.");
}
return(MaterializerUtilities.ConstructObject <TObject>(row, Constructor, Converter));
}
List <TMaster> GenerateObjects(Table table)
{
IEqualityComparer <object> comparer;
var columnType = table.ColumnTypeMap[m_MasterKeyColumn];
if (columnType == typeof(short))
{
comparer = new Int16EqualityComparer();
}
else if (columnType == typeof(int))
{
comparer = new Int32EqualityComparer();
}
else if (columnType == typeof(long))
{
comparer = new Int64EqualityComparer();
}
else if (columnType == typeof(Guid))
{
comparer = new GuidEqualityComparer();
}
else if (columnType == typeof(string))
{
comparer = new StringEqualityComparer();
}
else if (columnType == typeof(DateTime))
{
comparer = new DateTimeEqualityComparer();
}
else if (columnType == typeof(DateTimeOffset))
{
comparer = new DateTimeOffsetEqualityComparer();
}
else if (columnType == typeof(ulong))
{
comparer = new UInt64EqualityComparer();
}
else
{
throw new NotSupportedException($"Key column of type '{columnType.Name}' is not supported for Master/Detail collections.");
}
var groups = new Dictionary <object, List <Row> >(comparer);
foreach (var row in table.Rows)
{
var key = row[m_MasterKeyColumn];
if (key == null)
{
throw new MissingDataException($"A null was found in the master key column '{m_MasterKeyColumn}'");
}
if (!groups.TryGetValue(key, out var group))
{
group = new();
groups.Add(key, group);
}
group.Add(row);
}
var result = new List <TMaster>();
foreach (var group in groups.Values)
{
var master = MaterializerUtilities.ConstructObject <TMaster>(group[0], m_MasterConstructor, Converter);
var target = m_Map(master);
foreach (var row in group)
{
target.Add(MaterializerUtilities.ConstructObject <TDetail>(row, m_DetailConstructor, Converter));
}
result.Add(master);
}
return(result);
}