org.opencms.jlan

Class CmsFileBuffer

java.lang.Object

org.opencms.jlan.CmsFileBuffer

public class CmsFileBuffer
extends java.lang.Object

Buffer class which holds file contents for JLAN file access in memory before they are written to the VFS.

This is implemented as a CmsByteBuffer instance together with a 'position' index which marks the next write position

Constructor Summary

Constructors

Constructor and Description
CmsFileBuffer()

Method Summary

Modifier and Type	Method and Description
byte[]	getContents() Gets the contents of this buffer as a byte array.
long	getLength() Gets the length of the file content.
long	getPosition() Gets the current write position.
void	init(byte[] data) Initializes the file content data.
int	read(byte[] dest, int length, int bufferOffset, int fileOffset) Transfers data from this buffer to a byte array.
void	seek(long newPos) Changes the write position.
void	truncate(int size) Changes the size of this buffer.
void	write(byte[] data) Writes the data to the internal buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

CmsFileBuffer

public CmsFileBuffer()

Method Detail

getContents

public byte[] getContents()

Gets the contents of this buffer as a byte array.

Returns:

the file content

getLength

public long getLength()

Gets the length of the file content.

Returns:

the content length

getPosition

public long getPosition()

Gets the current write position.

Returns:

the current write position

init

public void init(byte[] data)

Initializes the file content data.

Parameters:

data - the file content data

read

public int read(byte[] dest,
                int length,
                int bufferOffset,
                int fileOffset)

Transfers data from this buffer to a byte array.

Parameters:

dest - the target byte array

length - the number of bytes to transfer

bufferOffset - the start index for the target buffer

fileOffset - the start index for this instance

Returns:

the number of bytes read, or -1 if we are at the end of the file

seek

public void seek(long newPos)

Changes the write position.

Parameters:

newPos - the new write position

truncate

public void truncate(int size)

Changes the size of this buffer.

Parameters:

size - the new size

write

public void write(byte[] data)

Writes the data to the internal buffer.

Parameters:

data - the data to write