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 = $"{nameof(PersistentIndex)} {dictionaryType} {fieldsType} {postingType} {textEncoding}",
MaxTokenSize = MaxTokenSize,
NextDocumentId = 0,
CreatedDate = DateTime.UtcNow,
ModifiedDate = DateTime.UtcNow,
};
}
else
{
var types = header.Type.Split(' ');
if (types[0] != nameof(PersistentIndex))
{
throw new InvalidOperationException("Index type and name mismatch");
}
if (types[1] != dictionaryType)
{
throw new InvalidOperationException("Field type and name mismatch");
}
if (types[2] != fieldsType)
{
throw new InvalidOperationException("Field type and name mismatch");
}
if (types[3] != postingType)
{
throw new InvalidOperationException("Posting type and name mismatch");
}
if (types[4] != textEncoding)
{
throw new InvalidOperationException("Text encoding type and name mismatch");
}
}
return(header);
}
public static ITermDictionary Create(string dictionaryType,
string folder,
string fileNameDictionary,
int maxTokenLength,
string encodingName)
{
if (dictionaryType == PersistentIndexName.DefaultValue || dictionaryType == PersistentDictionaryTst.Id)
{
return(new PersistentDictionaryTst(folder, fileNameDictionary, maxTokenLength, TextEncodingFactory.GetByName(encodingName)));
}
if (dictionaryType == PersistentDictionaryFst.Id)
{
return(new PersistentDictionaryFst(folder, fileNameDictionary, maxTokenLength, TextEncodingFactory.GetByName(encodingName)));
}
throw new NotSupportedException($"Dictionary type {dictionaryType} is not supported");
}
