com.liferay.portal.kernel.io.delta
Class RollingChecksum

java.lang.Object
  com.liferay.portal.kernel.io.delta.RollingChecksum

public class RollingChecksum
extends Object

Constructor Summary

RollingChecksum(ReadableByteChannel readableByteChannel, int blockLength)

Method Summary

int	currentBlockLength()
protected void	generateWeakChecksum()
byte	getFirstByte() Returns the first byte of data in the current block.
int	getPosition() Returns the position of the start of the current block in the file.
boolean	hasNext()
void	nextBlock()
void	nextByte()
byte[]	strongChecksum() Returns the strong checksum of the current block.
int	weakChecksum() Returns the weak checksum of the current block.

Methods inherited from class java.lang.Object

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

Constructor Detail

RollingChecksum

public RollingChecksum(ReadableByteChannel readableByteChannel,
                       int blockLength)
                throws IOException

Throws:

IOException

Method Detail

currentBlockLength

public int currentBlockLength()

getFirstByte

public byte getFirstByte()

Returns the first byte of data in the current block.

getPosition

public int getPosition()

Returns the position of the start of the current block in the file.

hasNext

public boolean hasNext()
                throws IOException

Throws:

IOException

nextBlock

public void nextBlock()
               throws IOException

Throws:

IOException

nextByte

public void nextByte()
              throws IOException

Throws:

IOException

strongChecksum

public byte[] strongChecksum()

Returns the strong checksum of the current block.

weakChecksum

public int weakChecksum()

Returns the weak checksum of the current block.

generateWeakChecksum

protected void generateWeakChecksum()
                             throws IOException

Throws:

IOException