/// <summary>
/// NOTE: This was loadShortField() in Lucene.
/// </summary>
private NumericDocValues LoadInt16Field(/*FieldInfo field, // LUCENENET: Never read */ IndexInput input)
{
CodecUtil.CheckHeader(input, Lucene40DocValuesFormat.INTS_CODEC_NAME, Lucene40DocValuesFormat.INTS_VERSION_START, Lucene40DocValuesFormat.INTS_VERSION_CURRENT);
int valueSize = input.ReadInt32();
if (valueSize != 2)
{
throw new CorruptIndexException("invalid valueSize: " + valueSize);
}
int maxDoc = state.SegmentInfo.DocCount;
short[] values = new short[maxDoc];
for (int i = 0; i < values.Length; i++)
{
values[i] = input.ReadInt16();
}
ramBytesUsed.AddAndGet(RamUsageEstimator.SizeOf(values));
return(new NumericDocValuesAnonymousClass4(values));
}
public override long Get(int index)
{
long majorBitPos = (long)index * m_bitsPerValue;
long elementPos = (long)((ulong)majorBitPos >> 3);
try
{
@in.Seek(startPointer + elementPos);
int bitPos = (int)(majorBitPos & 7);
// round up bits to a multiple of 8 to find total bytes needed to read
int roundedBits = ((bitPos + m_bitsPerValue + 7) & ~7);
// the number of extra bits read at the end to shift out
int shiftRightBits = roundedBits - bitPos - m_bitsPerValue;
long rawValue;
switch ((int)((uint)roundedBits >> 3))
{
case 1:
rawValue = @in.ReadByte();
break;
case 2:
rawValue = @in.ReadInt16();
break;
case 3:
rawValue = ((long)@in.ReadInt16() << 8) | (@in.ReadByte() & 0xFFL);
break;
case 4:
rawValue = @in.ReadInt32();
break;
case 5:
rawValue = ((long)@in.ReadInt32() << 8) | (@in.ReadByte() & 0xFFL);
break;
case 6:
rawValue = ((long)@in.ReadInt32() << 16) | (@in.ReadInt16() & 0xFFFFL);
break;
case 7:
rawValue = ((long)@in.ReadInt32() << 24) | ((@in.ReadInt16() & 0xFFFFL) << 8) | (@in.ReadByte() & 0xFFL);
break;
case 8:
rawValue = @in.ReadInt64();
break;
case 9:
// We must be very careful not to shift out relevant bits. So we account for right shift
// we would normally do on return here, and reset it.
rawValue = (@in.ReadInt64() << (8 - shiftRightBits)) | (((uint)(@in.ReadByte() & 0xFFL) >> shiftRightBits));
shiftRightBits = 0;
break;
default:
throw new InvalidOperationException("bitsPerValue too large: " + m_bitsPerValue);
}
return(((long)((ulong)rawValue >> shiftRightBits)) & valueMask);
}
catch (IOException ioe)
{
throw new InvalidOperationException("failed", ioe);
}
}
