org.xerial.db.cache
Class Buffer

java.lang.Object
  org.xerial.db.cache.Buffer

public class Buffer
extends Object

Buffer to read/write raw memory data

Author:

leo

Constructor Summary

Buffer(byte[] buffer)

Buffer(int bufferByteSize)

Method Summary

boolean	isSet(int bytePos, int bitPositionFromMSB)
void	load(DBFile dbFile)
boolean	readBoolean(int pos)
byte	readByte(int pos)
int	readInt(int pos) Reads an 32-bit integer (Big-endian) from the specified byte position.
long	readLong(int pos)
VariableLengthInteger	readVariableLengthInteger(int pos)
void	save(DBFile dbFile) Writes an utf-8 data 0xxxxxxx 110xxxxx 10xxxxxx 1110xxxx 10xxxxxx 10xxxxxx 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
void	set(int bytePos, int bitPositionFromMSB, boolean value)
int	size()
void	writeBoolean(int pos, boolean value)
void	writeByte(int pos, int b)
void	writeInt(int pos, int value)
void	writeLong(int pos, long value)
void	writeVariablenLengthInteger(int pos, VariableLengthInteger value)

Methods inherited from class java.lang.Object

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

Constructor Detail

Buffer

public Buffer(int bufferByteSize)

Buffer

public Buffer(byte[] buffer)

Method Detail

size

public int size()

readInt

public int readInt(int pos)

Reads an 32-bit integer (Big-endian) from the specified byte position.

Parameters:

pos -

Returns:

readByte

public byte readByte(int pos)

readLong

public long readLong(int pos)

readBoolean

public boolean readBoolean(int pos)

readVariableLengthInteger

public VariableLengthInteger readVariableLengthInteger(int pos)
                                                throws DBException

Throws:

DBException

isSet

public boolean isSet(int bytePos,
                     int bitPositionFromMSB)

set

public void set(int bytePos,
                int bitPositionFromMSB,
                boolean value)

writeByte

public void writeByte(int pos,
                      int b)

writeInt

public void writeInt(int pos,
                     int value)

writeLong

public void writeLong(int pos,
                      long value)

writeBoolean

public void writeBoolean(int pos,
                         boolean value)

writeVariablenLengthInteger

public void writeVariablenLengthInteger(int pos,
                                        VariableLengthInteger value)

save

public void save(DBFile dbFile)
          throws DBException

Writes an utf-8 data 0xxxxxxx 110xxxxx 10xxxxxx 1110xxxx 10xxxxxx 10xxxxxx 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx

Parameters:

pos - position to which data is written

data - the data buffer to be read

offset - an offset from the beginning of the data buffer

Throws:

UTFDataFormatException

DBException

load

public void load(DBFile dbFile)
          throws DBException

Throws:

DBException