com.hp.hpl.mesa.rdf.jena.rdb
Class DBIDHash

java.lang.Object
  |
  +--com.hp.hpl.mesa.rdf.jena.rdb.DBIDHash

All Implemented Interfaces:

IDBID

public class DBIDHash

extends java.lang.Object

implements IDBID

Interface for database identifiers. Most RDF entities (resources, literals, statements) have an associated database index. These are cached using RDB-specific variants of the jena "impl" classes. This can avoid some redundant database lookup.

This variant uses 8 character strings to stort 64bit hash values. Uses this representation instead of longs because some of our databases don't directly support longs but everyone supports char arrays (?)

Version:

$Revision: 1.2 $ on $Date: 2001/11/26 18:20:08 $

Author:

Dave Reynolds

Constructor Summary

DBIDHash(byte[] id)
constructor

DBIDHash(char[] id)
constructor

DBIDHash(java.lang.String id)
constructor

Method Summary

boolean	equals(java.lang.Object obj) Equality is based on the underlying object
java.lang.Object	getID() get the identifier as a String, fits calling signature of our generic sql interface.
long	getIDLong() get first 64 bits of the hash id as a Long
int	hashCode() Hash is based on the underlying object

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DBIDHash

public DBIDHash(char[] id)

constructor

DBIDHash

public DBIDHash(byte[] id)

constructor

DBIDHash

public DBIDHash(java.lang.String id)

constructor

Method Detail

getID

public java.lang.Object getID()

get the identifier as a String, fits calling signature of our generic sql interface.

Specified by:

getID in interface IDBID

getIDLong

public long getIDLong()

get first 64 bits of the hash id as a Long

hashCode

public int hashCode()

Hash is based on the underlying object

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Equality is based on the underlying object

Overrides:

equals in class java.lang.Object