private IEnumerable <DocumentScore> GetDocIdsByPrefix(Term term, FieldReader reader)
{
var terms = reader.GetTokens(term.Token).Select(token => new Term {
Field = term.Field, Token = token
}).ToList();
return(terms.SelectMany(t => GetDocIdsExact(t, reader)));
}
public IEnumerable <TokenInfo> GetAllTokens(string field)
{
int fieldId;
if (_fieldIndex.TryGetValue(field, out fieldId))
{
var f = FieldReader.Load(Path.Combine(_directory, fieldId + ".fld"));
return(f.GetAllTokens());
}
return(Enumerable.Empty <TokenInfo>().ToList());
}
private IEnumerable <DocumentScore> GetDocIdsExact(Term term, FieldReader reader)
{
var postings = reader.GetPostings(term.Token);
if (postings != null)
{
foreach (var posting in postings)
{
yield return(new DocumentScore {
DocId = posting.Key, Value = posting.Value.Count
});
}
}
}
private FieldReader GetReader(string field)
{
int fieldId;
if (_fieldIndex.TryGetValue(field, out fieldId))
{
FieldReader reader;
if (!_fieldReaders.TryGetValue(field, out reader))
{
reader = FieldReader.Load(Path.Combine(_directory, fieldId + ".fld"));
_fieldReaders.Add(field, reader);
}
return(reader);
}
return(null);
}