private bool TryGetAttributeMessageFromAttributeInfoMessage(AttributeInfoMessage attributeInfoMessage,
string name,
[NotNullWhen(returnValue: true)] out AttributeMessage?attributeMessage)
{
attributeMessage = null;
var fractalHeap = attributeInfoMessage.FractalHeap;
var btree2NameIndex = attributeInfoMessage.BTree2NameIndex;
var nameHash = H5Checksum.JenkinsLookup3(name);
var candidate = default(AttributeMessage);
var success = btree2NameIndex.TryFindRecord(out var record, record =>
{
#warning Better to implement comparison code in record (here: BTree2Record08) itself?
if (nameHash < record.NameHash)
{
return(-1);
}
else if (nameHash > record.NameHash)
{
return(1);
}
else
{
#warning duplicate2
using var localReader = new H5BinaryReader(new MemoryStream(record.HeapId));
var heapId = FractalHeapId.Construct(this.Context, localReader, fractalHeap);
candidate = heapId.Read(reader => new AttributeMessage(reader, this.Context.Superblock));
// https://stackoverflow.com/questions/35257814/consistent-string-sorting-between-c-sharp-and-c
// https://stackoverflow.com/questions/492799/difference-between-invariantculture-and-ordinal-string-comparison
return(string.CompareOrdinal(name, candidate.Name));
}
});
if (success)
{
if (candidate == null)
{
throw new Exception("This should never happen. Just to satisfy the compiler.");
}
attributeMessage = candidate;
return(true);
}
return(false);
}
private IEnumerable <AttributeMessage> EnumerateAttributeMessagesFromAttributeInfoMessage(AttributeInfoMessage attributeInfoMessage)
{
var btree2NameIndex = attributeInfoMessage.BTree2NameIndex;
var records = btree2NameIndex
.EnumerateRecords()
.ToList();
var fractalHeap = attributeInfoMessage.FractalHeap;
// local cache: indirectly accessed, non-filtered
List <BTree2Record01>?record01Cache = null;
foreach (var record in records)
{
#warning duplicate1
using var localReader = new H5BinaryReader(new MemoryStream(record.HeapId));
var heapId = FractalHeapId.Construct(this.Context, localReader, fractalHeap);
var message = heapId.Read(reader => new AttributeMessage(reader, this.Context.Superblock), ref record01Cache);
yield return(message);
}
}
