/// <summary>Returns the position of a Term in the set or -1. </summary>
internal long GetPosition(Term term)
{
if (size == 0)
{
return(-1);
}
int indexOffset = GetIndexOffset(term);
SeekEnum(indexOffset);
SegmentTermEnum enumerator = GetEnum();
while (term.CompareTo(enumerator.Term()) > 0 && enumerator.Next())
{
}
if (term.CompareTo(enumerator.Term()) == 0)
{
return(enumerator.position);
}
else
{
return(-1);
}
}
public /*internal*/ TermInfosReader(Directory dir, System.String seg, FieldInfos fis)
{
directory = dir;
segment = seg;
fieldInfos = fis;
origEnum = new SegmentTermEnum(directory.OpenFile(segment + ".tis"), fieldInfos, false);
size = origEnum.size;
ReadIndex();
}
public /*internal*/ TermInfosReader(Directory dir, System.String seg, FieldInfos fis)
{
directory = dir;
segment = seg;
fieldInfos = fis;
origEnum = new SegmentTermEnum(directory.OpenFile(segment + ".tis"), fieldInfos, false);
size = origEnum.size;
ReadIndex();
}
private SegmentTermEnum GetEnum()
{
SegmentTermEnum termEnum = (SegmentTermEnum)System.Threading.Thread.GetData(enumerators);
if (termEnum == null)
{
termEnum = Terms();
System.Threading.Thread.SetData(enumerators, termEnum);
}
return(termEnum);
}
private Term ScanEnum(int position)
{
SegmentTermEnum enumerator = GetEnum();
while (enumerator.position < position)
{
if (!enumerator.Next())
{
return(null);
}
}
return(enumerator.Term());
}
/// <summary>Returns the nth term in the set. </summary>
internal Term Get(int position)
{
if (size == 0)
{
return(null);
}
SegmentTermEnum enumerator = GetEnum();
if (enumerator != null && enumerator.Term() != null && position >= enumerator.position && position < (enumerator.position + enumerator.indexInterval))
{
return(ScanEnum(position)); // can avoid seek
}
SeekEnum(position / enumerator.indexInterval); // must seek
return(ScanEnum(position));
}
/// <summary>Scans within block for matching term. </summary>
private TermInfo ScanEnum(Term term)
{
SegmentTermEnum enumerator = GetEnum();
while (term.CompareTo(enumerator.Term()) > 0 && enumerator.Next())
{
}
if (enumerator.Term() != null && term.CompareTo(enumerator.Term()) == 0)
{
return(enumerator.TermInfo());
}
else
{
return(null);
}
}
public System.Object Clone()
{
SegmentTermEnum clone = null;
try
{
clone = (SegmentTermEnum)base.MemberwiseClone();
}
catch (System.Exception)
{
}
clone.input = (InputStream)input.Clone();
clone.termInfo = new TermInfo(termInfo);
if (term != null)
{
clone.GrowBuffer(term.text.Length);
}
return(clone);
}
private void ReadIndex()
{
SegmentTermEnum indexEnum = new SegmentTermEnum(directory.OpenFile(segment + ".tii"), fieldInfos, true);
try
{
int indexSize = (int) indexEnum.size;
indexTerms = new Term[indexSize];
indexInfos = new TermInfo[indexSize];
indexPointers = new long[indexSize];
for (int i = 0; indexEnum.Next(); i++)
{
indexTerms[i] = indexEnum.Term();
indexInfos[i] = indexEnum.TermInfo();
indexPointers[i] = indexEnum.indexPointer;
}
}
finally
{
indexEnum.Close();
}
}
/// <summary>Returns the TermInfo for a Term in the set, or null. </summary>
public /*internal*/ TermInfo Get(Term term)
{
if (size == 0)
{
return(null);
}
// optimize sequential access: first try scanning cached enum w/o seeking
SegmentTermEnum enumerator = GetEnum();
if (enumerator.Term() != null && ((enumerator.prev != null && term.CompareTo(enumerator.prev) > 0) || term.CompareTo(enumerator.Term()) >= 0))
{
int enumOffset = (int)(enumerator.position / enumerator.indexInterval) + 1;
if (indexTerms.Length == enumOffset || term.CompareTo(indexTerms[enumOffset]) < 0)
{
return(ScanEnum(term)); // no need to seek
}
}
// random-access: must seek
SeekEnum(GetIndexOffset(term));
return(ScanEnum(term));
}
private void ReadIndex()
{
SegmentTermEnum indexEnum = new SegmentTermEnum(directory.OpenFile(segment + ".tii"), fieldInfos, true);
try
{
int indexSize = (int)indexEnum.size;
indexTerms = new Term[indexSize];
indexInfos = new TermInfo[indexSize];
indexPointers = new long[indexSize];
for (int i = 0; indexEnum.Next(); i++)
{
indexTerms[i] = indexEnum.Term();
indexInfos[i] = indexEnum.TermInfo();
indexPointers[i] = indexEnum.indexPointer;
}
}
finally
{
indexEnum.Close();
}
}
