jdbm.recman

Class Location

java.lang.Object

jdbm.recman.Location

final class Location
extends java.lang.Object

This class represents a location within a file. Both physical and logical rowids are based on locations internally - this version is used when there is no file block to back the location's data.

Field Summary

Fields

Modifier and Type	Field and Description
private long	blockId The block in which the data is stored
private short	offset The offset within this block

Constructor Summary

Constructors

Constructor and Description
Location(long blockOffset) Creates a location from a combined block/offset long, as used in the external representation of logical rowids.
Location(long blockId, short offset) Creates a location from a (block, offset) tuple.
Location(PhysicalRowId physicalRowId) Creates a location based on the data of the physical rowid.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
(package private) long	getBlock()
(package private) short	getOffset() Returns the offset within the block of the location
int	hashCode()
(package private) long	toLong() Returns the external representation of a location when used as a logical rowid, which combines the block and the offset in a single long.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

blockId

private long blockId

The block in which the data is stored

offset

private short offset

The offset within this block

Constructor Detail

Location

Location(long blockId,
         short offset)

Creates a location from a (block, offset) tuple.

Parameters:

blockId - The block identifier

offset - the offset in the block

Location

Location(long blockOffset)

Creates a location from a combined block/offset long, as used in the external representation of logical rowids. A recid is a logical rowid.

Parameters:

blockOffset - The block + offset combinaison

Location

Location(PhysicalRowId physicalRowId)

Creates a location based on the data of the physical rowid.

Parameters:

physicalRowId - The physical row id used as a base for the Location creation

Method Detail

getBlock

long getBlock()

getOffset

short getOffset()

Returns the offset within the block of the location

toLong

long toLong()

Returns the external representation of a location when used as a logical rowid, which combines the block and the offset in a single long.

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object