private int[][] ReadPositions(int skip, int numFields, PackedInts.Reader flags, PackedInts.Reader numTerms, int[] termFreqs, int flag, int totalPositions, int[][] positionIndex)
{
int[][] positions = new int[numFields][];
reader.Reset(vectorsStream, totalPositions);
// skip
int toSkip = 0;
int termIndex = 0;
for (int i = 0; i < skip; ++i)
{
int f = (int)flags.Get(i);
int termCount = (int)numTerms.Get(i);
if ((f & flag) != 0)
{
for (int j = 0; j < termCount; ++j)
{
int freq = termFreqs[termIndex + j];
toSkip += freq;
}
}
termIndex += termCount;
}
reader.Skip(toSkip);
// read doc positions
for (int i = 0; i < numFields; ++i)
{
int f = (int)flags.Get(skip + i);
int termCount = (int)numTerms.Get(skip + i);
if ((f & flag) != 0)
{
int totalFreq = positionIndex[i][termCount];
int[] fieldPositions = new int[totalFreq];
positions[i] = fieldPositions;
for (int j = 0; j < totalFreq; )
{
LongsRef nextPositions = reader.Next(totalFreq - j);
for (int k = 0; k < nextPositions.Length; ++k)
{
fieldPositions[j++] = (int)nextPositions.Longs[nextPositions.Offset + k];
}
}
}
termIndex += termCount;
}
reader.Skip(totalPositions - reader.Ord());
return positions;
}
// field -> term index -> position index
private int[][] PositionIndex(int skip, int numFields, PackedInts.Reader numTerms, int[] termFreqs)
{
int[][] positionIndex = new int[numFields][];
int termIndex = 0;
for (int i = 0; i < skip; ++i)
{
int termCount = (int)numTerms.Get(i);
termIndex += termCount;
}
for (int i = 0; i < numFields; ++i)
{
int termCount = (int)numTerms.Get(skip + i);
positionIndex[i] = new int[termCount + 1];
for (int j = 0; j < termCount; ++j)
{
int freq = termFreqs[termIndex + j];
positionIndex[i][j + 1] = positionIndex[i][j] + freq;
}
termIndex += termCount;
}
return positionIndex;
}
