/// <summary> Add a complete document specified by all its term vectors. If document has no
/// term vectors, add value for tvx.
///
/// </summary>
/// <param name="vectors">
/// </param>
/// <throws> IOException </throws>
public void AddAllDocVectors(TermFreqVector[] vectors)
{
tvx.WriteLong(tvd.GetFilePointer());
tvx.WriteLong(tvf.GetFilePointer());
if (vectors != null)
{
int numFields = vectors.Length;
tvd.WriteVInt(numFields);
long[] fieldPointers = new long[numFields];
for (int i = 0; i < numFields; i++)
{
fieldPointers[i] = tvf.GetFilePointer();
int fieldNumber = fieldInfos.FieldNumber(vectors[i].GetField());
// 1st pass: write field numbers to tvd
tvd.WriteVInt(fieldNumber);
int numTerms = vectors[i].Size();
tvf.WriteVInt(numTerms);
TermPositionVector tpVector;
byte bits;
bool storePositions;
bool storeOffsets;
if (vectors[i] is TermPositionVector)
{
// May have positions & offsets
tpVector = (TermPositionVector)vectors[i];
storePositions = tpVector.Size() > 0 && tpVector.GetTermPositions(0) != null;
storeOffsets = tpVector.Size() > 0 && tpVector.GetOffsets(0) != null;
bits = (byte)((storePositions?TermVectorsReader.STORE_POSITIONS_WITH_TERMVECTOR: (byte)0) + (storeOffsets?TermVectorsReader.STORE_OFFSET_WITH_TERMVECTOR: (byte)0));
}
else
{
tpVector = null;
bits = 0;
storePositions = false;
storeOffsets = false;
}
tvf.WriteVInt(bits);
System.String[] terms = vectors[i].GetTerms();
int[] freqs = vectors[i].GetTermFrequencies();
int utf8Upto = 0;
utf8Results[1].length = 0;
for (int j = 0; j < numTerms; j++)
{
UnicodeUtil.UTF16toUTF8(terms[j], 0, terms[j].Length, utf8Results[utf8Upto]);
int start = StringHelper.BytesDifference(utf8Results[1 - utf8Upto].result, utf8Results[1 - utf8Upto].length, utf8Results[utf8Upto].result, utf8Results[utf8Upto].length);
int length = utf8Results[utf8Upto].length - start;
tvf.WriteVInt(start); // write shared prefix length
tvf.WriteVInt(length); // write delta length
tvf.WriteBytes(utf8Results[utf8Upto].result, start, length); // write delta bytes
utf8Upto = 1 - utf8Upto;
int termFreq = freqs[j];
tvf.WriteVInt(termFreq);
if (storePositions)
{
int[] positions = tpVector.GetTermPositions(j);
if (positions == null)
{
throw new System.SystemException("Trying to write positions that are null!");
}
System.Diagnostics.Debug.Assert(positions.Length == termFreq);
// use delta encoding for positions
int lastPosition = 0;
for (int k = 0; k < positions.Length; k++)
{
int position = positions[k];
tvf.WriteVInt(position - lastPosition);
lastPosition = position;
}
}
if (storeOffsets)
{
TermVectorOffsetInfo[] offsets = tpVector.GetOffsets(j);
if (offsets == null)
{
throw new System.SystemException("Trying to write offsets that are null!");
}
System.Diagnostics.Debug.Assert(offsets.Length == termFreq);
// use delta encoding for offsets
int lastEndOffset = 0;
for (int k = 0; k < offsets.Length; k++)
{
int startOffset = offsets[k].GetStartOffset();
int endOffset = offsets[k].GetEndOffset();
tvf.WriteVInt(startOffset - lastEndOffset);
tvf.WriteVInt(endOffset - startOffset);
lastEndOffset = endOffset;
}
}
}
}
// 2nd pass: write field pointers to tvd
if (numFields > 1)
{
long lastFieldPointer = fieldPointers[0];
for (int i = 1; i < numFields; i++)
{
long fieldPointer = fieldPointers[i];
tvd.WriteVLong(fieldPointer - lastFieldPointer);
lastFieldPointer = fieldPointer;
}
}
}
else
{
tvd.WriteVInt(0);
}
}
