/// <summary>
/// Loads the segment information at segment load time.
/// </summary>
/// <param name="indexEnum">
/// The term enum. </param>
/// <param name="indexDivisor">
/// The index divisor. </param>
/// <param name="tiiFileLength">
/// The size of the tii file, used to approximate the size of the
/// buffer. </param>
/// <param name="totalIndexInterval">
/// The total index interval. </param>
public TermInfosReaderIndex(SegmentTermEnum indexEnum, int indexDivisor, long tiiFileLength, int totalIndexInterval)
{
this.totalIndexInterval = totalIndexInterval;
indexSize = 1 + ((int)indexEnum.size - 1) / indexDivisor;
skipInterval = indexEnum.skipInterval;
// this is only an inital size, it will be GCed once the build is complete
long initialSize = (long)(tiiFileLength * 1.5) / indexDivisor;
PagedBytes dataPagedBytes = new PagedBytes(EstimatePageBits(initialSize));
PagedBytesDataOutput dataOutput = dataPagedBytes.GetDataOutput();
int bitEstimate = 1 + MathUtil.Log(tiiFileLength, 2);
GrowableWriter indexToTerms = new GrowableWriter(bitEstimate, indexSize, PackedInt32s.DEFAULT);
string currentField = null;
IList <string> fieldStrs = new List <string>();
int fieldCounter = -1;
for (int i = 0; indexEnum.Next(); i++)
{
Term term = indexEnum.Term();
if (currentField == null || !currentField.Equals(term.Field, StringComparison.Ordinal))
{
currentField = term.Field;
fieldStrs.Add(currentField);
fieldCounter++;
}
TermInfo termInfo = indexEnum.TermInfo();
indexToTerms.Set(i, dataOutput.GetPosition());
dataOutput.WriteVInt32(fieldCounter);
dataOutput.WriteString(term.Text());
dataOutput.WriteVInt32(termInfo.DocFreq);
if (termInfo.DocFreq >= skipInterval)
{
dataOutput.WriteVInt32(termInfo.SkipOffset);
}
dataOutput.WriteVInt64(termInfo.FreqPointer);
dataOutput.WriteVInt64(termInfo.ProxPointer);
dataOutput.WriteVInt64(indexEnum.indexPointer);
for (int j = 1; j < indexDivisor; j++)
{
if (!indexEnum.Next())
{
break;
}
}
}
fields = new Term[fieldStrs.Count];
for (int i = 0; i < fields.Length; i++)
{
fields[i] = new Term(fieldStrs[i]);
}
dataPagedBytes.Freeze(true);
dataInput = dataPagedBytes.GetDataInput();
indexToDataOffset = indexToTerms.Mutable;
ramBytesUsed = fields.Length * (RamUsageEstimator.NUM_BYTES_OBJECT_REF + RamUsageEstimator.ShallowSizeOfInstance(typeof(Term))) + dataPagedBytes.RamBytesUsed() + indexToDataOffset.RamBytesUsed();
}
private IEnumerable <BytesRef> GetBytesIterator(int maxDocParam)
{
// Use yield return instead of ucsom IEnumerable
var value = new BytesRef();
AppendingDeltaPackedInt64Buffer.Iterator lengthsIterator = lengths.GetIterator();
int size = (int)lengths.Count;
DataInput bytesIterator = bytes.GetDataInput();
int maxDoc = maxDocParam;
int upto = 0;
while (upto < maxDoc)
{
BytesRef v = null;
if (upto < size)
{
int length = (int)lengthsIterator.Next();
value.Grow(length);
value.Length = length;
try
{
bytesIterator.ReadBytes(value.Bytes, value.Offset, value.Length);
}
catch (Exception ioe) when(ioe.IsIOException())
{
// Should never happen!
throw RuntimeException.Create(ioe);
}
if (docsWithField.Get(upto))
{
v = value;
}
}
upto++;
yield return(v);
}
}
