public PersistentIndex(PersistentIndexName name)
{
var folder = name.Folder;
if (!PersistentIndexInfo.Exists(folder, FileNameInfo))
{
throw new InvalidOperationException("No index");
}
HeaderReader = new PersistentIndexInfo(folder, FileNameInfo);
Header = HeaderReader.Read();
if (Header == null)
{
throw new InvalidOperationException("No index");
}
VerifyHeader(name);
var indexType = Header.Type.Split(' ');
Dictionary = PersistentDictionaryFactory.Create(indexType[1], folder, FileNameDictionary, Header.MaxTokenSize, indexType[4]);
PostingLists = PostingListIOFactory.CreateReader(indexType[3], folder, FileNamePostingLists);
PosIndex = PersistentDictionaryFactory.Create(indexType[1], folder, FileNamePosIndex, PosIndexKeySize, indexType[4]);
PositionsReader = new DeltaVarIntListReader(folder, FileNamePositions);
Fields = PersistentMetadataFactory.CreateStorage(indexType[2], folder, FileNameFields);
this.name = name;
}
protected override IFullTextIndexHeader GetIndexHeader()
{
var header = indexInfo.Read();
var dictionaryType = PersistentDictionaryFactory.GetName(name.DictionaryType);
var fieldsType = PersistentMetadataFactory.GetName(name.FieldsType);
var postingType = PostingListIOFactory.GetName(name.PostingType);
var textEncoding = TextEncodingFactory.GetName(name.TextEncoding);
if (header == null)
{
header = new IndexHeaderData
{
Type = $"{nameof(PersistentIndex)} {dictionaryType} {fieldsType} {postingType} {textEncoding}",
MaxTokenSize = MaxTokenSize,
NextDocumentId = 0,
CreatedDate = DateTime.UtcNow,
ModifiedDate = DateTime.UtcNow,
};
}
else
{
var types = header.Type.Split(' ');
if (types[0] != nameof(PersistentIndex))
{
throw new InvalidOperationException("Index type and name mismatch");
}
if (types[1] != dictionaryType)
{
throw new InvalidOperationException("Field type and name mismatch");
}
if (types[2] != fieldsType)
{
throw new InvalidOperationException("Field type and name mismatch");
}
if (types[3] != postingType)
{
throw new InvalidOperationException("Posting type and name mismatch");
}
if (types[4] != textEncoding)
{
throw new InvalidOperationException("Text encoding type and name mismatch");
}
}
return(header);
}
protected override void DoStart()
{
base.DoStart();
indexInfo = new PersistentIndexInfo(Folder, PersistentIndex.FileNameInfo);
fields = PersistentMetadataFactory.CreateStorage(name.FieldsType, Folder, PersistentIndex.FileNameFields);
occurrenceWriter = PostingListIOFactory.CreateWriter(name.PostingType, Folder, PersistentIndex.FileNamePostingLists);
dictionaryWriter = PersistentDictionaryFactory.CreateWriter(name.DictionaryType, Folder, PersistentIndex.FileNameDictionary, MaxTokenSize, name.TextEncoding);
dictionaryUpdate = dictionaryWriter.BeginUpdate();
posIndexWriter = PersistentDictionaryFactory.CreateWriter(name.DictionaryType, Folder, PersistentIndex.FileNamePosIndex, PersistentIndex.PosIndexKeySize, name.TextEncoding);
posIndexUpdate = posIndexWriter.BeginUpdate();
positionsWriter = new DeltaVarIntListWriter(Folder, PersistentIndex.FileNamePositions);
dictUpdates = 0;
posUpdates = 0;
}
