protected override Group GenerateGroupsInternal(CancellationToken cancellationToken)
{
var dbContainer = Context.I.DbContainer;
var root = new Group(this)
{
Caption = RootGroupCaption, Level = 0
};
var records = dbContainer.AudioBookSet.GetRecordsAllWithCache();
var recordsByProperty = new Dictionary <string, Group>(StringComparer.InvariantCultureIgnoreCase);
var alphabetGroups = new Dictionary <string, Group>(StringComparer.InvariantCultureIgnoreCase);
var emptyPropertyGroup = new Group(this)
{
Caption = ValueNotSetCaption,
Level = 1
};
root.Add(emptyPropertyGroup);
alphabetGroups.Add(ValueNotSetCaption, emptyPropertyGroup);
foreach (var audioBook in records)
{
var propertyValues = GetPropertyValues(audioBook);
if (propertyValues.Any())
{
foreach (var propertyValue in propertyValues)
{
var firstLetter = propertyValue[0].ToString().ToUpper();
var isLetter = _isLetterRegex.IsMatch(firstLetter);
if (!isLetter)
{
firstLetter = OtherValuesCaption;
}
if (!alphabetGroups.TryGetValue(firstLetter, out var alphabetGroup))
{
alphabetGroup = new Group(this)
{
Caption = firstLetter,
Level = 1
};
alphabetGroups.Add(firstLetter.ToUpper(), alphabetGroup);
root.Add(alphabetGroup);
}
if (!recordsByProperty.TryGetValue(propertyValue, out var group))
{
var propertyValueForDisplay =
propertyValue
.TrimToLength(40)
.ChangeCase(Extensions.CaseTypes.AllWords, false, false);
group = new Group(this)
{
Caption = propertyValueForDisplay,
Level = 2
};
recordsByProperty[propertyValue] = group;
alphabetGroup.Add(group);
}
group.LinkedRecords.Add(audioBook.Key);
alphabetGroup.LinkedRecords.Add(audioBook.Key);
}
}
else
{
emptyPropertyGroup.LinkedRecords.Add(audioBook.Key);
}
}
foreach (var propertyValueGroup in recordsByProperty)
{
propertyValueGroup.Value.Caption =
$"{propertyValueGroup.Value.Caption} [{propertyValueGroup.Value.LinkedRecords.Count}]";
}
foreach (var alphabetGroup in alphabetGroups)
{
alphabetGroup.Value.Caption += $" [{alphabetGroup.Value.LinkedRecords.Count}]";
alphabetGroup.Value.OrderByCaption();
}
root.OrderByCaption();
return(root);
}
protected override IEnumerable <IAudioBook> GetRecordsInner(IDbContainer dbContainer, Group group,
CancellationToken cancellationToken)
{
IEnumerable <IAudioBook> result;
if (group == null || group.Level == 0)
{
result = dbContainer.AudioBookSet.GetRecordsAllWithCache();
}
else
{
result = dbContainer.AudioBookSet.GetRecordsByKeys(group.LinkedRecords);
}
return(result);
}
