/// <summary>Increments the enumeration to the next element. True if one exists.</summary>
public override bool Next()
{
if (position++ >= size - 1)
{
term = null;
return(false);
}
prev = term;
term = ReadTerm();
termInfo.docFreq = input.ReadVInt(); // read doc freq
termInfo.freqPointer += input.ReadVLong(); // read freq pointer
termInfo.proxPointer += input.ReadVLong(); // read prox pointer
if (format == -1)
{
// just read skipOffset in order to increment file pointer;
// value is never used since skipTo is switched off
if (!isIndex)
{
if (termInfo.docFreq > formatM1SkipInterval)
{
termInfo.skipOffset = input.ReadVInt();
}
}
}
else
{
if (termInfo.docFreq >= skipInterval)
{
termInfo.skipOffset = input.ReadVInt();
}
}
if (isIndex)
{
indexPointer += input.ReadVLong(); // read index pointer
}
return(true);
}
/// <summary> Retrieve the term vector for the given document and Field</summary>
/// <param name="docNum">The document number to retrieve the vector for
/// </param>
/// <param name="Field">The Field within the document to retrieve
/// </param>
/// <returns> The TermFreqVector for the document and Field or null
/// </returns>
public /*internal*/ virtual TermFreqVector Get(int docNum, System.String field)
{
lock (this)
{
// Check if no term vectors are available for this segment at all
int fieldNumber = fieldInfos.FieldNumber(field);
TermFreqVector result = null;
if (tvx != null)
{
try
{
//We need to account for the FORMAT_SIZE at when seeking in the tvx
//We don't need to do this in other seeks because we already have the file pointer
//that was written in another file
tvx.Seek((docNum * 8L) + TermVectorsWriter.FORMAT_SIZE);
//System.out.println("TVX Pointer: " + tvx.getFilePointer());
long position = tvx.ReadLong();
tvd.Seek(position);
int fieldCount = tvd.ReadVInt();
//System.out.println("Num Fields: " + fieldCount);
// There are only a few fields per document. We opt for a full scan
// rather then requiring that they be ordered. We need to read through
// all of the fields anyway to get to the tvf pointers.
int number = 0;
int found = -1;
for (int i = 0; i < fieldCount; i++)
{
number += tvd.ReadVInt();
if (number == fieldNumber)
{
found = i;
}
}
// This Field, although valid in the segment, was not found in this document
if (found != -1)
{
// Compute position in the tvf file
position = 0;
for (int i = 0; i <= found; i++)
{
position += tvd.ReadVLong();
}
result = ReadTermVector(field, position);
}
else
{
//System.out.println("Field not found");
}
}
catch (System.Exception e)
{
//System.Console.Out.WriteLine(e.StackTrace);
}
}
else
{
System.Console.Out.WriteLine("No tvx file");
}
return(result);
}
}
