/// <summary> Construct the vector</summary>
/// <returns> The {@link TermFreqVector} based on the mappings.
/// </returns>
public virtual TermFreqVector MaterializeVector()
{
SegmentTermVector tv = null;
if (field != null && terms != null)
{
if (storingPositions || storingOffsets)
{
tv = new SegmentTermPositionVector(field, terms, termFreqs, positions, offsets);
}
else
{
tv = new SegmentTermVector(field, terms, termFreqs);
}
}
return(tv);
}
/// <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>
/// <returns> The TermVector located at that position
/// </returns>
/// <throws> IOException </throws>
private SegmentTermVector ReadTermVector(System.String field, long tvfPointer)
{
// 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(new SegmentTermVector(field, null, null));
}
bool storePositions;
bool storeOffsets;
if (tvfFormat == TermVectorsWriter.FORMAT_VERSION)
{
byte bits = tvf.ReadByte();
storePositions = (bits & TermVectorsWriter.STORE_POSITIONS_WITH_TERMVECTOR) != 0;
storeOffsets = (bits & TermVectorsWriter.STORE_OFFSET_WITH_TERMVECTOR) != 0;
}
else
{
tvf.ReadVInt();
storePositions = false;
storeOffsets = false;
}
System.String[] terms = new System.String[numTerms];
int[] termFreqs = new int[numTerms];
// we may not need these, but declare them
int[][] positions = null;
TermVectorOffsetInfo[][] offsets = null;
if (storePositions)
{
positions = new int[numTerms][];
}
if (storeOffsets)
{
offsets = new TermVectorOffsetInfo[numTerms][];
}
int start = 0;
int deltaLength = 0;
int totalLength = 0;
char[] buffer = new char[10]; // init the buffer with a length of 10 character
char[] previousBuffer = new char[] {};
for (int i = 0; i < numTerms; i++)
{
start = tvf.ReadVInt();
deltaLength = tvf.ReadVInt();
totalLength = start + deltaLength;
if (buffer.Length < totalLength)
{
// increase buffer
buffer = null; // give a hint to garbage collector
buffer = new char[totalLength];
if (start > 0)
{
// just copy if necessary
Array.Copy(previousBuffer, 0, buffer, 0, start);
}
}
tvf.ReadChars(buffer, start, deltaLength);
terms[i] = new System.String(buffer, 0, totalLength);
previousBuffer = buffer;
int freq = tvf.ReadVInt();
termFreqs[i] = freq;
if (storePositions)
{
//read in the positions
int[] pos = new int[freq];
positions[i] = pos;
int prevPosition = 0;
for (int j = 0; j < freq; j++)
{
pos[j] = prevPosition + tvf.ReadVInt();
prevPosition = pos[j];
}
}
if (storeOffsets)
{
TermVectorOffsetInfo[] offs = new TermVectorOffsetInfo[freq];
offsets[i] = offs;
int prevOffset = 0;
for (int j = 0; j < freq; j++)
{
int startOffset = prevOffset + tvf.ReadVInt();
int endOffset = startOffset + tvf.ReadVInt();
offs[j] = new TermVectorOffsetInfo(startOffset, endOffset);
prevOffset = endOffset;
}
}
}
SegmentTermVector tv;
if (storePositions || storeOffsets)
{
tv = new SegmentTermPositionVector(field, terms, termFreqs, positions, offsets);
}
else
{
tv = new SegmentTermVector(field, terms, termFreqs);
}
return(tv);
}
/// <summary> Construct the vector</summary>
/// <returns> The {@link TermFreqVector} based on the mappings.
/// </returns>
public virtual TermFreqVector MaterializeVector()
{
SegmentTermVector tv = null;
if (field != null && terms != null)
{
if (storingPositions || storingOffsets)
{
tv = new SegmentTermPositionVector(field, terms, termFreqs, positions, offsets);
}
else
{
tv = new SegmentTermVector(field, terms, termFreqs);
}
}
return tv;
}
/// <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>
/// <returns> The TermVector located at that position
/// </returns>
/// <throws> IOException </throws>
private SegmentTermVector ReadTermVector(System.String field, long tvfPointer)
{
// 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 new SegmentTermVector(field, null, null);
bool storePositions;
bool storeOffsets;
if (tvfFormat == TermVectorsWriter.FORMAT_VERSION)
{
byte bits = tvf.ReadByte();
storePositions = (bits & TermVectorsWriter.STORE_POSITIONS_WITH_TERMVECTOR) != 0;
storeOffsets = (bits & TermVectorsWriter.STORE_OFFSET_WITH_TERMVECTOR) != 0;
}
else
{
tvf.ReadVInt();
storePositions = false;
storeOffsets = false;
}
System.String[] terms = new System.String[numTerms];
int[] termFreqs = new int[numTerms];
// we may not need these, but declare them
int[][] positions = null;
TermVectorOffsetInfo[][] offsets = null;
if (storePositions)
positions = new int[numTerms][];
if (storeOffsets)
offsets = new TermVectorOffsetInfo[numTerms][];
int start = 0;
int deltaLength = 0;
int totalLength = 0;
char[] buffer = new char[10]; // init the buffer with a length of 10 character
char[] previousBuffer = new char[]{};
for (int i = 0; i < numTerms; i++)
{
start = tvf.ReadVInt();
deltaLength = tvf.ReadVInt();
totalLength = start + deltaLength;
if (buffer.Length < totalLength)
{
// increase buffer
buffer = null; // give a hint to garbage collector
buffer = new char[totalLength];
if (start > 0)
// just copy if necessary
Array.Copy(previousBuffer, 0, buffer, 0, start);
}
tvf.ReadChars(buffer, start, deltaLength);
terms[i] = new System.String(buffer, 0, totalLength);
previousBuffer = buffer;
int freq = tvf.ReadVInt();
termFreqs[i] = freq;
if (storePositions)
{
//read in the positions
int[] pos = new int[freq];
positions[i] = pos;
int prevPosition = 0;
for (int j = 0; j < freq; j++)
{
pos[j] = prevPosition + tvf.ReadVInt();
prevPosition = pos[j];
}
}
if (storeOffsets)
{
TermVectorOffsetInfo[] offs = new TermVectorOffsetInfo[freq];
offsets[i] = offs;
int prevOffset = 0;
for (int j = 0; j < freq; j++)
{
int startOffset = prevOffset + tvf.ReadVInt();
int endOffset = startOffset + tvf.ReadVInt();
offs[j] = new TermVectorOffsetInfo(startOffset, endOffset);
prevOffset = endOffset;
}
}
}
SegmentTermVector tv;
if (storePositions || storeOffsets)
{
tv = new SegmentTermPositionVector(field, terms, termFreqs, positions, offsets);
}
else
{
tv = new SegmentTermVector(field, terms, termFreqs);
}
return tv;
}
