org.xerial.db
Class VariableLengthInteger

java.lang.Object
  org.xerial.db.VariableLengthInteger

public class VariableLengthInteger
extends Object

Variable length number representation. When the most significant bit (MSB) of a byte is 0, it means the termination of the value, when the MSB of a byte is 1, its following bytes must be read to compute the value. 0XXXXXXX : [0, 127 (= M1 - 1)] 1XXXXXXX 0XXXXXXX : [M1, M1 + 127 * 2^7 + 127 (= M2-1)] 1XXXXXXX 1XXXXXXX 0XXXXXXX : [M2, M2 + 127 * 2^14 + 127 * 2^7 + 127] [0, 0 + (2 ^ 7 - 1) = 127] [128, 128 + (2^14 - 1) = 16511] [16512, 16512 + (2^21 - 1) = 2113663]

Author:

leo

Constructor Summary

VariableLengthInteger(byte[] byteArray, int offset)

VariableLengthInteger(int value)

Method Summary

static int	byteSize(byte[] buffer, int offset)
static int	byteSize(int value) Gets the byte size of the value as an variable length integer
byte[]	getByte()
int	intValue()
static int	readFrom(byte[] buffer, int offset)
static VariableLengthInteger	readFrom(ByteArrayInputStream buffer)
int	size()
int	writeTo(BufferWriter writer)

Methods inherited from class java.lang.Object

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

Constructor Detail

VariableLengthInteger

public VariableLengthInteger(int value)

VariableLengthInteger

public VariableLengthInteger(byte[] byteArray,
                             int offset)
                      throws DBException

Throws:

DBException

Method Detail

getByte

public byte[] getByte()

size

public int size()

intValue

public int intValue()

byteSize

public static int byteSize(byte[] buffer,
                           int offset)
                    throws DBException

Throws:

DBException

byteSize

public static int byteSize(int value)

Gets the byte size of the value as an variable length integer

Parameters:

value -

Returns:

readFrom

public static int readFrom(byte[] buffer,
                           int offset)
                    throws DBException

Throws:

DBException

readFrom

public static VariableLengthInteger readFrom(ByteArrayInputStream buffer)
                                      throws DBException

Throws:

DBException

writeTo

public int writeTo(BufferWriter writer)