public static Predicate <int> GetDocsExistenceVerificationMethodInSet(this IndexReader reader, string field, Predicate <string> termAcceptanceFunction)
{
ConcurrentDictionary <Tuple <string, Predicate <string> >, Predicate <int> > value;
if (documentIdsSetBuildersCache.TryGetValue(reader, out value) == false)
{
value = documentIdsSetBuildersCache.GetOrCreateValue(reader);
_keys.Add(new WeakReference <IndexReader>(reader));
IndexReader target;
_keys.RemoveWhere(x => x.TryGetTarget(out target) == false);
}
var readerFieldTuple = Tuple.Create(field, termAcceptanceFunction);
Predicate <int> predicate;
if (value.TryGetValue(readerFieldTuple, out predicate))
{
return(predicate);
}
var termDocs = reader.TermDocs();
var termEnum = reader.Terms(new Term(field));
int t = 0; // current term number
var maxDoc = reader.MaxDoc;
var documentsIDsSet = new DocumentsIDsSetBuilder(reader.MaxDoc);
do
{
Term term = termEnum.Term;
if (term == null || term.Field != field || t >= maxDoc)
{
break;
}
bool termMatches = termAcceptanceFunction(term.Text);
if (termMatches)
{
termDocs.Seek(termEnum);
while (termDocs.Next())
{
documentsIDsSet.Set(termDocs.Doc);
}
}
t++;
}while (termEnum.Next());
predicate = documentsIDsSet.Build();
value.TryAdd(readerFieldTuple, predicate);
return(predicate);
}
public static Predicate<int> GetDocsExistenceVerificationMethodInSet(this IndexReader reader, string field, Predicate<string> termAcceptanceFunction)
{
ConcurrentDictionary<Tuple<string, Predicate<string>>, Predicate<int>> value;
if (documentIdsSetBuildersCache.TryGetValue(reader, out value) == false)
{
value = documentIdsSetBuildersCache.GetOrCreateValue(reader);
_keys.Add(new WeakReference<IndexReader>(reader));
IndexReader target;
_keys.RemoveWhere(x=>x.TryGetTarget(out target) == false);
}
var readerFieldTuple = Tuple.Create(field, termAcceptanceFunction);
Predicate<int> predicate;
if (value.TryGetValue(readerFieldTuple, out predicate))
return predicate;
var termDocs = reader.TermDocs();
var termEnum = reader.Terms(new Term(field));
int t = 0; // current term number
var maxDoc = reader.MaxDoc;
var documentsIDsSet = new DocumentsIDsSetBuilder(32);
do
{
Term term = termEnum.Term;
if (term == null || term.Field != field || t >= maxDoc) break;
bool termMatches = termAcceptanceFunction(term.Text);
if (termMatches)
{
termDocs.Seek(termEnum);
while (termDocs.Next())
{
documentsIDsSet.Set(termDocs.Doc);
}
}
t++;
}
while (termEnum.Next());
predicate = documentsIDsSet.Build();
value.TryAdd(readerFieldTuple, predicate);
return predicate;
}