com.bigdata.journal

Class RWAddressManager

java.lang.Object

com.bigdata.journal.RWAddressManager

All Implemented Interfaces:

IAddressManager

public class RWAddressManager
extends Object
implements IAddressManager

FIXME unit tests.

Field Summary

Fields inherited from interface com.bigdata.rawstore.IAddressManager

NULL

Constructor Summary

Constructors

Constructor and Description
RWAddressManager(RWStore store)

Method Summary

Methods

Modifier and Type	Method and Description
int	getByteCount(long addr) The length of the datum in bytes.
long	getOffset(long addr) The offset on the store at which the datum is stored.
long	getPhysicalAddress(long addr) Determine the unencoded physical address
long	toAddr(int nbytes, long offset) Converts a byte count and offset into a long integer.
String	toString(long addr) A human readable representation of the address.

Methods inherited from class java.lang.Object

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

Constructor Detail

RWAddressManager

public RWAddressManager(RWStore store)

Method Detail

getByteCount

public int getByteCount(long addr)

Description copied from interface: IAddressManager

The length of the datum in bytes. This must be the actual length of the record on the disk, not the length of the caller's byte[]. This is necessary in order to support transparent checksums and/or compression for records in the IRawStore.

Specified by:

getByteCount in interface IAddressManager

Parameters:

addr - The opaque identifier that is the within store locator for some datum.

Returns:

The offset of that datum.

getOffset

public long getOffset(long addr)

Description copied from interface: IAddressManager

The offset on the store at which the datum is stored. While this is often the offset of a byte into a file on disk, implementations MAY assign offsets using other strategies.

Specified by:

getOffset in interface IAddressManager

Parameters:

addr - The opaque identifier that is the within store locator for some datum.

Returns:

The offset of that datum.

getPhysicalAddress

public long getPhysicalAddress(long addr)

Description copied from interface: IAddressManager

Determine the unencoded physical address

Specified by:

getPhysicalAddress in interface IAddressManager

Parameters:

addr - The encoded address

Returns:

an unencoded address offset

toAddr

public long toAddr(int nbytes,
          long offset)

Description copied from interface: IAddressManager

Converts a byte count and offset into a long integer.

Specified by:

toAddr in interface IAddressManager

Parameters:

nbytes - The byte count.

offset - The byte offset.

Returns:

The long integer.

toString

public String toString(long addr)

Description copied from interface: IAddressManager

A human readable representation of the address.

Specified by:

toString in interface IAddressManager

Parameters:

addr - The opaque identifier that is the within store locator for some datum.

Returns:

A human readable representation.