public void Read(IndexInput input, FieldInfos fieldInfos, IState state)
{
this.term = null; // invalidate cache
int start = input.ReadVInt(state);
int length = input.ReadVInt(state);
int totalLength = start + length;
if (preUTF8Strings)
{
text.SetLength(totalLength);
input.ReadChars(text.result, start, length, state);
}
else
{
if (dirty)
{
// Fully convert all bytes since bytes is dirty
UnicodeUtil.UTF16toUTF8(text.result, 0, text.length, bytes);
bytes.SetLength(totalLength);
input.ReadBytes(bytes.result, start, length, state);
UnicodeUtil.UTF8toUTF16(bytes.result, 0, totalLength, text);
dirty = false;
}
else
{
// Incrementally convert only the UTF8 bytes that are new:
bytes.SetLength(totalLength);
input.ReadBytes(bytes.result, start, length, state);
UnicodeUtil.UTF8toUTF16(bytes.result, start, length, text);
}
}
this.field = fieldInfos.FieldName(input.ReadVInt(state));
}
/// <summary>The value of the field as a String, or null. If null, the Reader value,
/// binary value, or TokenStream value is used. Exactly one of StringValue(),
/// ReaderValue(), GetBinaryValue(), and TokenStreamValue() must be set.
/// </summary>
public override string StringValue(IState state)
{
Enclosing_Instance.EnsureOpen();
if (internalIsBinary)
{
return(null);
}
if (fieldsData == null)
{
IndexInput localFieldsStream = GetFieldStream(state);
try
{
localFieldsStream.Seek(pointer, state);
if (isCompressed)
{
var b = new byte[toRead];
localFieldsStream.ReadBytes(b, 0, b.Length, state);
fieldsData =
System.Text.Encoding.GetEncoding("UTF-8").GetString(Enclosing_Instance.Uncompress(b));
}
else
{
if (Enclosing_Instance.format >= FieldsWriter.FORMAT_VERSION_UTF8_LENGTH_IN_BYTES)
{
var bytes = new byte[toRead];
localFieldsStream.ReadBytes(bytes, 0, toRead, state);
fieldsData = System.Text.Encoding.GetEncoding("UTF-8").GetString(bytes);
}
else
{
//read in chars b/c we already know the length we need to read
var chars = new char[toRead];
localFieldsStream.ReadChars(chars, 0, toRead, state);
fieldsData = new System.String(chars);
}
}
}
catch (System.IO.IOException e)
{
throw new FieldReaderException(e);
}
}
return((System.String)fieldsData);
}
/// <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, IState state)
{
// 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, state);
int numTerms = tvf.ReadVInt(state);
//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(state);
storePositions = (bits & STORE_POSITIONS_WITH_TERMVECTOR) != 0;
storeOffsets = (bits & STORE_OFFSET_WITH_TERMVECTOR) != 0;
}
else
{
tvf.ReadVInt(state);
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(state);
deltaLength = tvf.ReadVInt(state);
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, state);
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, state);
term = System.Text.Encoding.UTF8.GetString(byteBuffer, 0, totalLength);
}
int freq = tvf.ReadVInt(state);
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(state);
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(state);
}
}
}
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(state);
int endOffset = startOffset + tvf.ReadVInt(state);
offsets[j] = new TermVectorOffsetInfo(startOffset, endOffset);
prevOffset = endOffset;
}
}
else
{
for (int j = 0; j < freq; j++)
{
tvf.ReadVInt(state);
tvf.ReadVInt(state);
}
}
}
mapper.Map(term, freq, offsets, positions);
}
}