org.metastatic.rsync
Class Offsets

java.lang.Object
  |
  +--org.metastatic.rsync.Offsets

All Implemented Interfaces:

Delta, Serializable

public class Offsets

extends Object

implements Delta, Serializable

This class represents an update to a file or array of bytes wherein the bytes themselves have not changed, but have moved to another location. This is represented by three fields: the offset in the original data, the offset in the new data, and the length, in bytes, of this block.

See Also:

Serialized Form

Field Summary

protected int	blockLength The size of the moved block, in bytes.
protected long	newOffset The new offset.
protected long	oldOffset The original offset.

Constructor Summary

Offsets(long oldOffset, long newOffset, int blockLength)
Create a new pair of offsets.

Method Summary

boolean	equals(Object o) Test if one object is equal to this one.
int	getBlockLength() The size of the block of data this class represents.
long	getNewOffset() Get the updated offset.
long	getOldOffset() Get the original offset.
long	getWriteOffset() Get the offset at which this Delta should be written.
int	hashCode() Returns the hash code of this object, defined as: oldOffset + newOffset + blockLength % 2^32
void	setBlockLength(int len) Set the block size.
void	setNewOffset(long off) Set the updated offset.
void	setOldOffset(long off) Set the original offset.
String	toString() Return a String representation of this object.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

oldOffset

protected long oldOffset

The original offset.

Since:

1.1

newOffset

protected long newOffset

The new offset.

Since:

1.1

blockLength

protected int blockLength

The size of the moved block, in bytes.

Since:

1.1

Constructor Detail

Offsets

public Offsets(long oldOffset,
               long newOffset,
               int blockLength)

Create a new pair of offsets. The idea behind this object is that this sort of Delta represents original data that has simply moved in the new data.

Parameters:

oldOffset - The offset in the original data.

newOffset - The offset in the new data.

blockLength - The size, in bytes, of the block that has moved.

Since:

1.1

Method Detail

getWriteOffset

public long getWriteOffset()

Description copied from interface: Delta

Get the offset at which this Delta should be written.

Specified by:

getWriteOffset in interface Delta

Returns:

The write offset.

getBlockLength

public int getBlockLength()

Description copied from interface: Delta

The size of the block of data this class represents.

Specified by:

getBlockLength in interface Delta

Returns:

The size of the block of data this class represents.

getOldOffset

public long getOldOffset()

Get the original offset.

Returns:

The original offset.

setOldOffset

public void setOldOffset(long off)

Set the original offset.

Parameters:

off - The new value for the original offset.

getNewOffset

public long getNewOffset()

Get the updated offset.

Returns:

The updated offset.

setNewOffset

public void setNewOffset(long off)

Set the updated offset.

Parameters:

off - The new value for the updated offset.

setBlockLength

public void setBlockLength(int len)

Set the block size.

Parameters:

len - The new value for the block size.

toString

public String toString()

Return a String representation of this object.

Overrides:

toString in class Object

Returns:

A string representing this object.

equals

public boolean equals(Object o)

Test if one object is equal to this one.

Overrides:

equals in class Object

Returns:

true If o is an Offsets instance and the oldOffset, newOffset, and blockLength fields are all equal.

Throws:

ClassCastException - If o is not an instance of this class.

NullPointerException - If o is null.

hashCode

public int hashCode()

Returns the hash code of this object, defined as:

oldOffset + newOffset + blockLength % 2^32

Overrides:

hashCode in class Object

Returns:

The hash code of this object.