internal virtual void addTerm(System.String term, TermVectorOffsetInfo info)
{
terms.Add(term);
if (offsets != null)
{
offsets.Add(info);
}
}
/// <summary> </summary>
/// <param name="term">The term to map
/// </param>
/// <param name="frequency">The frequency of the term
/// </param>
/// <param name="offsets">Offset information, may be null
/// </param>
/// <param name="positions">Position information, may be null
/// </param>
//We need to combine any previous mentions of the term
public override void Map(System.String term, int frequency, TermVectorOffsetInfo[] offsets, int[] positions)
{
TermVectorEntry entry = termToTVE[term];
if (entry == null)
{
entry = new TermVectorEntry(ALL, term, frequency, storeOffsets == true?offsets:null, storePositions == true?positions:null);
termToTVE[term] = entry;
currentSet.Add(entry);
}
else
{
entry.Frequency = entry.Frequency + frequency;
if (storeOffsets)
{
TermVectorOffsetInfo[] existingOffsets = entry.GetOffsets();
//A few diff. cases here: offsets is null, existing offsets is null, both are null, same for positions
if (existingOffsets != null && offsets != null && offsets.Length > 0)
{
//copy over the existing offsets
TermVectorOffsetInfo[] newOffsets = new TermVectorOffsetInfo[existingOffsets.Length + offsets.Length];
Array.Copy(existingOffsets, 0, newOffsets, 0, existingOffsets.Length);
Array.Copy(offsets, 0, newOffsets, existingOffsets.Length, offsets.Length);
entry.SetOffsets(newOffsets);
}
else if (existingOffsets == null && offsets != null && offsets.Length > 0)
{
entry.SetOffsets(offsets);
}
//else leave it alone
}
if (storePositions)
{
int[] existingPositions = entry.GetPositions();
if (existingPositions != null && positions != null && positions.Length > 0)
{
int[] newPositions = new int[existingPositions.Length + positions.Length];
Array.Copy(existingPositions, 0, newPositions, 0, existingPositions.Length);
Array.Copy(positions, 0, newPositions, existingPositions.Length, positions.Length);
entry.SetPositions(newPositions);
}
else if (existingPositions == null && positions != null && positions.Length > 0)
{
entry.SetPositions(positions);
}
}
}
}
/// <summary> </summary>
/// <param name="field">The field to read in
/// </param>
/// <param name="tvfPointer">The pointer within the tvf file where we should start reading
/// </param>
/// <param name="mapper">The mapper used to map the TermVector
/// </param>
/// <throws> IOException </throws>
private void ReadTermVector(System.String field, long tvfPointer, TermVectorMapper mapper)
{
// Now read the data from specified position
//We don't need to offset by the FORMAT here since the pointer already includes the offset
tvf.Seek(tvfPointer);
int numTerms = tvf.ReadVInt();
//System.out.println("Num Terms: " + numTerms);
// If no terms - return a constant empty termvector. However, this should never occur!
if (numTerms == 0)
{
return;
}
bool storePositions;
bool storeOffsets;
if (format >= FORMAT_VERSION)
{
byte bits = tvf.ReadByte();
storePositions = (bits & STORE_POSITIONS_WITH_TERMVECTOR) != 0;
storeOffsets = (bits & STORE_OFFSET_WITH_TERMVECTOR) != 0;
}
else
{
tvf.ReadVInt();
storePositions = false;
storeOffsets = false;
}
mapper.SetExpectations(field, numTerms, storeOffsets, storePositions);
int start = 0;
int deltaLength = 0;
int totalLength = 0;
byte[] byteBuffer;
char[] charBuffer;
bool preUTF8 = format < FORMAT_UTF8_LENGTH_IN_BYTES;
// init the buffers
if (preUTF8)
{
charBuffer = new char[10];
byteBuffer = null;
}
else
{
charBuffer = null;
byteBuffer = new byte[20];
}
for (int i = 0; i < numTerms; i++)
{
start = tvf.ReadVInt();
deltaLength = tvf.ReadVInt();
totalLength = start + deltaLength;
System.String term;
if (preUTF8)
{
// Term stored as java chars
if (charBuffer.Length < totalLength)
{
char[] newCharBuffer = new char[(int)(1.5 * totalLength)];
Array.Copy(charBuffer, 0, newCharBuffer, 0, start);
charBuffer = newCharBuffer;
}
tvf.ReadChars(charBuffer, start, deltaLength);
term = new System.String(charBuffer, 0, totalLength);
}
else
{
// Term stored as utf8 bytes
if (byteBuffer.Length < totalLength)
{
byte[] newByteBuffer = new byte[(int)(1.5 * totalLength)];
Array.Copy(byteBuffer, 0, newByteBuffer, 0, start);
byteBuffer = newByteBuffer;
}
tvf.ReadBytes(byteBuffer, start, deltaLength);
term = System.Text.Encoding.UTF8.GetString(byteBuffer, 0, totalLength);
}
int freq = tvf.ReadVInt();
int[] positions = null;
if (storePositions)
{
//read in the positions
//does the mapper even care about positions?
if (mapper.IsIgnoringPositions == false)
{
positions = new int[freq];
int prevPosition = 0;
for (int j = 0; j < freq; j++)
{
positions[j] = prevPosition + tvf.ReadVInt();
prevPosition = positions[j];
}
}
else
{
//we need to skip over the positions. Since these are VInts, I don't believe there is anyway to know for sure how far to skip
//
for (int j = 0; j < freq; j++)
{
tvf.ReadVInt();
}
}
}
TermVectorOffsetInfo[] offsets = null;
if (storeOffsets)
{
//does the mapper even care about offsets?
if (mapper.IsIgnoringOffsets == false)
{
offsets = new TermVectorOffsetInfo[freq];
int prevOffset = 0;
for (int j = 0; j < freq; j++)
{
int startOffset = prevOffset + tvf.ReadVInt();
int endOffset = startOffset + tvf.ReadVInt();
offsets[j] = new TermVectorOffsetInfo(startOffset, endOffset);
prevOffset = endOffset;
}
}
else
{
for (int j = 0; j < freq; j++)
{
tvf.ReadVInt();
tvf.ReadVInt();
}
}
}
mapper.Map(term, freq, offsets, positions);
}
}
