com.apelon.dts.common
Class IIDGenerator

java.lang.Object
  com.apelon.dts.common.IIDGenerator

public class IIDGenerator
extends Object

Description: Generates a Unique Instance Identifier (IID) for the given namespace. The IIDs are unique as the namespace id is embedded as 16 MSB and 48 LSB have the sequence number.

IIDs are unique numbers to identify an instance of an DTS Schema Object (ex: Property, Association, Qualifier, etc)

Copyright: Copyright (c) 2005

Company: Apelon, Inc.

Version:

1.0

Author:

unascribed

Field Summary

static int	EXIT_OPTION
static int	IID_OPTION
static int	LIMIT_OPTION
static String	PROMPT

Constructor Summary

IIDGenerator()

Method Summary

static long	getIdFromIID(long iid) Given an IID, this method will get the sequence_id (48 lsb bits) for it
static long	getIID(int namespace_id, long seq_id) Synthesis a IID from a given namespace id (16 bits), object id (48 bits)
static int	getNamespaceIdFromGid(long gid) Given a GID, its namespaceId can be found with this method.
static long[]	getNamespaceMaxAndMinGID(int namespace_id) Deprecated. Use getNamespaceMaxAndMinIID() instead
static long[]	getNamespaceMaxAndMinIID(int namespace_id) A method to get the IID boundaries per namespace.
static void	main(String[] args)

Methods inherited from class java.lang.Object

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

Field Detail

PROMPT

public static String PROMPT

IID_OPTION

public static int IID_OPTION

LIMIT_OPTION

public static int LIMIT_OPTION

EXIT_OPTION

public static int EXIT_OPTION

Constructor Detail

IIDGenerator

public IIDGenerator()

Method Detail

getIID

public static long getIID(int namespace_id,
                          long seq_id)

Synthesis a IID from a given namespace id (16 bits), object id (48 bits)

Parameters:

namespace_id - the namespace id

seq_id - the object id

Returns:

the IID value

getNamespaceIdFromGid

public static int getNamespaceIdFromGid(long gid)

Given a GID, its namespaceId can be found with this method.

Parameters:

gid - The gid whose namespace id is to be found

Returns:

The namespace id

getIdFromIID

public static long getIdFromIID(long iid)

Given an IID, this method will get the sequence_id (48 lsb bits) for it

Parameters:

iid - The IID value to be inspected

Returns:

the sequence_id in above IID.

getNamespaceMaxAndMinGID

public static long[] getNamespaceMaxAndMinGID(int namespace_id)

Deprecated. Use getNamespaceMaxAndMinIID() instead

A method to get the IID boundaries per namespace. Can be useful when making selective queries and the table does not have namespace information (id).

Parameters:

namespace_id - the namespace id

Returns:

a long array of size 2, with minimum IID value as the first element and maximum IID value as the second element

getNamespaceMaxAndMinIID

public static long[] getNamespaceMaxAndMinIID(int namespace_id)

A method to get the IID boundaries per namespace. Can be useful when making selective queries and the table does not have namespace information (id).

Parameters:

namespace_id - the namespace id

Returns:

a long array of size 2, with minimum IID value as the first element and maximum IID value as the second element

main

public static void main(String[] args)