org.tmatesoft.sqljet.core.internal

Interface ISqlJetMemoryBuffer

All Known Implementing Classes:

SqlJetByteArrayBuffer, SqlJetByteBuffer, SqlJetDirectByteBuffer

public interface ISqlJetMemoryBuffer

Represents SQLJet's operations with memory.

Author:

TMate Software Ltd., Sergey Scherbina (sergey.scherbina@gmail.com)

Method Summary

Modifier and Type	Method and Description
void	allocate(int size) Allocate chunk of memory.
byte[]	asArray()
int	compareTo(int pointer, ISqlJetMemoryBuffer buffer, int bufferPointer)
void	copyFrom(int dstPos, ISqlJetMemoryBuffer src, int srcPos, int count)
void	fill(int from, int count, byte value)
void	free() Fries chunk of memory.
byte	getByte(int pointer) Read byte at pointer.
void	getBytes(int pointer, byte[] bytes, int to, int count)
int	getByteUnsigned(int pointer) Read unsigned byte at pointer.
int	getInt(int pointer) Read int at pointer.
long	getIntUnsigned(int pointer) Read unsigned int at pointer.
long	getLong(int pointer) Read long at pointer.
ISqlJetMemoryPointer	getPointer(int pointer) Returns pointer in memory chunk at passed offset.
short	getShort(int pointer) Read short at pointer.
int	getShortUnsigned(int pointer) Read unsigned short at pointer.
int	getSize() Size of allocated memory chunk.
boolean	isAllocated() Returns true if memory is allocated.
void	putByte(int pointer, byte value) Write byte at pointer.
void	putBytes(int pointer, byte[] bytes, int from, int count)
void	putByteUnsigned(int pointer, int value) Write unsigned byte at pointer.
void	putInt(int pointer, int value) Write int at pointer.
void	putIntUnsigned(int pointer, long value) Write unsigned int at pointer.
void	putLong(int pointer, long value) Write long at pointer.
void	putShort(int pointer, short value) Write short at pointer.
void	putShortUnsigned(int pointer, int value) Write unsigned short at pointer.
int	readFromFile(int pointer, java.io.RandomAccessFile file, long position, int count) Read from file into memory chunk at pointer.
int	writeToFile(int pointer, java.io.RandomAccessFile file, long position, int count) Write from memory chunk at pointer to file.

Method Detail

allocate

void allocate(int size)

Allocate chunk of memory. If memory already has allocated then fries current chunk and allocates new.

Parameters:

size - size of chunk in bytes

free

void free()

Fries chunk of memory.

isAllocated

boolean isAllocated()

Returns true if memory is allocated.

Returns:

getPointer

ISqlJetMemoryPointer getPointer(int pointer)

Returns pointer in memory chunk at passed offset.

Parameters:

pointer -

Returns:

getSize

int getSize()

Size of allocated memory chunk.

Returns:

getByte

byte getByte(int pointer)

Read byte at pointer.

Parameters:

pointer -

Returns:

putByte

void putByte(int pointer,
             byte value)

Write byte at pointer.

Parameters:

pointer -

value -

getShort

short getShort(int pointer)

Read short at pointer.

Parameters:

pointer -

Returns:

putShort

void putShort(int pointer,
              short value)

Write short at pointer.

Parameters:

pointer -

value -

getInt

int getInt(int pointer)

Read int at pointer.

Parameters:

pointer -

Returns:

putInt

void putInt(int pointer,
            int value)

Write int at pointer.

Parameters:

pointer -

value -

getLong

long getLong(int pointer)

Read long at pointer.

Parameters:

pointer -

Returns:

putLong

void putLong(int pointer,
             long value)

Write long at pointer.

Parameters:

pointer -

value -

getByteUnsigned

int getByteUnsigned(int pointer)

Read unsigned byte at pointer.

Parameters:

pointer -

Returns:

putByteUnsigned

void putByteUnsigned(int pointer,
                     int value)

Write unsigned byte at pointer.

Parameters:

pointer -

value -

getShortUnsigned

int getShortUnsigned(int pointer)

Read unsigned short at pointer.

Parameters:

pointer -

Returns:

putShortUnsigned

void putShortUnsigned(int pointer,
                      int value)

Write unsigned short at pointer.

Parameters:

pointer -

value -

getIntUnsigned

long getIntUnsigned(int pointer)

Read unsigned int at pointer.

Parameters:

pointer -

Returns:

putIntUnsigned

void putIntUnsigned(int pointer,
                    long value)

Write unsigned int at pointer.

Parameters:

pointer -

value -

readFromFile

int readFromFile(int pointer,
                 java.io.RandomAccessFile file,
                 long position,
                 int count)
          throws java.io.IOException

Read from file into memory chunk at pointer. Method isn't synchronized on file.

Parameters:

pointer -

file -

position -

count -

Returns:

Throws:

java.io.IOException

writeToFile

int writeToFile(int pointer,
                java.io.RandomAccessFile file,
                long position,
                int count)
         throws java.io.IOException

Write from memory chunk at pointer to file. Method isn't synchronized on file.

Parameters:

pointer -

file -

position -

count -

Returns:

Throws:

java.io.IOException

copyFrom

void copyFrom(int dstPos,
              ISqlJetMemoryBuffer src,
              int srcPos,
              int count)

Parameters:

dstPos -

src -

srcPos -

count -

fill

void fill(int from,
          int count,
          byte value)

Parameters:

from -

count -

value -

getBytes

void getBytes(int pointer,
              byte[] bytes,
              int to,
              int count)

Parameters:

absolute -

bytes -

to -

count -

putBytes

void putBytes(int pointer,
              byte[] bytes,
              int from,
              int count)

Parameters:

absolute -

bytes -

to -

count -

asArray

byte[] asArray()

Returns:

compareTo

int compareTo(int pointer,
              ISqlJetMemoryBuffer buffer,
              int bufferPointer)

Parameters:

pointer -

buffer -

pointer2 -

Returns: