public IList <Document> ReadDocuments(IList <int> documentIds)
{
var addresses = new List <BlockInfo>(documentIds.Count);
foreach (var id in documentIds)
{
addresses.Add(new BlockInfo(id * _blockSize, _blockSize));
}
var docAddresses = _addressReader.Read(addresses);
var index = 0;
var documents = new List <Document>(documentIds.Count);
_stream.Seek(Version.KeyIndexOffset, SeekOrigin.Begin);
var keyIndex = TableSerializer.ReadKeyIndex(_stream, Version.KeyIndexSize);
using (var documentReader = new DocumentReader(
_stream, Version.Compression, keyIndex, leaveOpen: true))
foreach (var document in documentReader.Read(docAddresses))
{
document.Id = documentIds[index++];
documents.Add(document);
}
return(documents);
}
private IEnumerable <Document> StreamDocuments()
{
var skipped = 0;
var took = 0;
for (int docId = 0; docId < _ix.DocumentCount; docId++)
{
var hash = _hashReader.Read(docId);
var address = _addressReader.Read(new[]
{
new BlockInfo(docId * BlockSerializer.SizeOfBlock(), BlockSerializer.SizeOfBlock())
}).First();
var document = _documentReader.Read(new List <BlockInfo> {
address
}).First();
if (!hash.IsObsolete)
{
if (skipped == _skip && took < _take)
{
yield return(document);
took++;
}
else if (skipped < _skip)
{
skipped++;
}
else if (took == _take)
{
break;
}
}
}
}
