pegasus.mapreduce.common.utils

Class IDUtils

java.lang.Object

pegasus.mapreduce.common.utils.IDUtils

public class IDUtils
extends java.lang.Object

Provides some utility methods about vertex IDs.

Constructor Summary

Constructors

Constructor and Description
IDUtils()

Method Summary

Modifier and Type	Method and Description
static int	globalToLocal(int numBlocks, long globalId) Converts a global vertex ID to local vertex ID.
static long	localToGlobal(int numBlocks, int blockId, int localId) Converts a local vertex ID to global vertex ID.

Methods inherited from class java.lang.Object

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

Constructor Detail

IDUtils

public IDUtils()

Method Detail

globalToLocal

public static int globalToLocal(int numBlocks,
                                long globalId)

Converts a global vertex ID to local vertex ID.

Parameters:

numBlocks - The number of total vector blocks

globalId - A global ID of vertex

Returns:

A local ID of the given vertex

localToGlobal

public static long localToGlobal(int numBlocks,
                                 int blockId,
                                 int localId)

Converts a local vertex ID to global vertex ID.

Parameters:

numBlocks - The number of total vector blocks

blockId - An ID of vector block who contains the vertex

localId - A local ID of vertex

Returns:

A global ID of the given vertex