org.apache.iotdb.tsfile.encoding.bitpacking

Class LongPacker

java.lang.Object

org.apache.iotdb.tsfile.encoding.bitpacking.LongPacker

public class LongPacker
extends Object

This class is used to encode(decode) Long in Java with specified bit-width. User need to guarantee that the length of every given Long in binary mode is less than or equal to the bit-width.

e.g., if bit-width is 31, then Long '2147483648'(2^31) is not allowed but '2147483647'(2^31-1) is allowed.

Constructor Summary

Constructors

Constructor and Description
LongPacker(int width)

Method Summary

Modifier and Type	Method and Description
void	pack8Values(long[] values, int offset, byte[] buf) Encode 8 (NUM_OF_LONGS) Longs from the array 'values' with specified bit-width to bytes.
void	setWidth(int width)
void	unpack8Values(byte[] buf, int offset, long[] values) decode values from byte array.
void	unpackAllValues(byte[] buf, int length, long[] values) decode all values from 'buf' with specified offset and length decoded result will be saved in array named 'values'.

Methods inherited from class java.lang.Object

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

Constructor Detail

LongPacker

public LongPacker(int width)

Method Detail

pack8Values

public void pack8Values(long[] values,
                        int offset,
                        byte[] buf)

Encode 8 (NUM_OF_LONGS) Longs from the array 'values' with specified bit-width to bytes.

Parameters:

values - - array where '8 Longs' are in

offset - - the offset of first Long to be encoded

buf - - encoded bytes, buf size must be equal to (NUM_OF_LONGS} * IntPacker.width / 8)

unpack8Values

public void unpack8Values(byte[] buf,
                          int offset,
                          long[] values)

decode values from byte array.

Parameters:

buf - - array where bytes are in.

offset - - offset of first byte to be decoded in buf

values - - decoded result , the size of values should be 8

unpackAllValues

public void unpackAllValues(byte[] buf,
                            int length,
                            long[] values)

decode all values from 'buf' with specified offset and length decoded result will be saved in array named 'values'.

Parameters:

buf - array where all bytes are in.

length - length of bytes to be decoded in buf.

values - decoded result

setWidth

public void setWidth(int width)