org.apache.iotdb.tsfile.encoding.decoder

Class DeltaBinaryDecoder

java.lang.Object

org.apache.iotdb.tsfile.encoding.decoder.Decoder

org.apache.iotdb.tsfile.encoding.decoder.DeltaBinaryDecoder

Direct Known Subclasses:

DeltaBinaryDecoder.IntDeltaDecoder, DeltaBinaryDecoder.LongDeltaDecoder

public abstract class DeltaBinaryDecoder
extends Decoder

This class is a decoder for decoding the byte array that encoded by DeltaBinaryEncoder.DeltaBinaryDecoder just supports integer and long values.
.

See Also:

DeltaBinaryEncoder

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DeltaBinaryDecoder.IntDeltaDecoder
static class	DeltaBinaryDecoder.LongDeltaDecoder

Field Summary

Fields

Modifier and Type	Field and Description
protected long	count
protected byte[]	deltaBuf
protected int	encodingLength how many bytes data takes after encoding.
protected int	nextReadIndex
protected int	packNum data number in this pack.
protected int	packWidth max bit length of all value in a pack.
protected int	readIntTotalCount the first value in one pack.

Constructor Summary

Constructors

Constructor and Description
DeltaBinaryDecoder()

Method Summary

Modifier and Type	Method and Description
protected abstract void	allocateDataArray()
protected int	ceil(int v) calculate the bytes length containing v bits.
boolean	hasNext(ByteBuffer buffer)
protected abstract void	readHeader(ByteBuffer buffer)
protected abstract void	readValue(int i)

Methods inherited from class org.apache.iotdb.tsfile.encoding.decoder.Decoder

getDecoderByType, getType, readBigDecimal, readBinary, readBoolean, readDouble, readFloat, readInt, readLong, readShort, reset, setType

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

count

protected long count

deltaBuf

protected byte[] deltaBuf

readIntTotalCount

protected int readIntTotalCount

the first value in one pack.

nextReadIndex

protected int nextReadIndex

packWidth

protected int packWidth

max bit length of all value in a pack.

packNum

protected int packNum

data number in this pack.

encodingLength

protected int encodingLength

how many bytes data takes after encoding.

Constructor Detail

DeltaBinaryDecoder

public DeltaBinaryDecoder()

Method Detail

readHeader

protected abstract void readHeader(ByteBuffer buffer)
                            throws IOException

Throws:

IOException

allocateDataArray

protected abstract void allocateDataArray()

readValue

protected abstract void readValue(int i)

ceil

protected int ceil(int v)

calculate the bytes length containing v bits.

Parameters:

v - - number of bits

Returns:

number of bytes

hasNext

public boolean hasNext(ByteBuffer buffer)
                throws IOException

Specified by:

hasNext in class Decoder

Throws:

IOException