org.janusgraph.graphdb.database.idhandling

Class IDHandler

java.lang.Object

org.janusgraph.graphdb.database.idhandling.IDHandler

public class IDHandler
extends Object

Author:

Matthias Broecheler ([email protected])

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	IDHandler.DirectionID
static class	IDHandler.RelationTypeParse

Field Summary

Fields

Modifier and Type	Field and Description
static StaticBuffer	MAX_KEY
static StaticBuffer	MIN_KEY

Constructor Summary

Constructors

Constructor and Description
IDHandler()

Method Summary

Modifier and Type	Method and Description
static StaticBuffer[]	getBounds(RelationCategory type, boolean systemTypes)
static StaticBuffer	getRelationType(long relationTypeId, IDHandler.DirectionID dirID, boolean invisible)
static long	readInlineRelationType(ReadBuffer in)
static IDHandler.RelationTypeParse	readRelationType(ReadBuffer in)
static int	relationTypeLength(long relationTypeId)
static void	writeInlineRelationType(WriteBuffer out, long relationTypeId)
static void	writeRelationType(WriteBuffer out, long relationTypeId, IDHandler.DirectionID dirID, boolean invisible) The edge type is written as follows: [ Invisible & System (2 bit) | Relation-Type-ID (1 bit) | Relation-Type-Count (variable) | Direction-ID (1 bit)] Would only need 1 bit to store relation-type-id, but using two so we can upper bound.

Methods inherited from class java.lang.Object

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

Field Detail

MIN_KEY

public static final StaticBuffer MIN_KEY

MAX_KEY

public static final StaticBuffer MAX_KEY

Constructor Detail

IDHandler

public IDHandler()

Method Detail

relationTypeLength

public static int relationTypeLength(long relationTypeId)

writeRelationType

public static void writeRelationType(WriteBuffer out,
                                     long relationTypeId,
                                     IDHandler.DirectionID dirID,
                                     boolean invisible)

The edge type is written as follows: [ Invisible & System (2 bit) | Relation-Type-ID (1 bit) | Relation-Type-Count (variable) | Direction-ID (1 bit)] Would only need 1 bit to store relation-type-id, but using two so we can upper bound.

Parameters:

out -

relationTypeId -

dirID -

getRelationType

public static StaticBuffer getRelationType(long relationTypeId,
                                           IDHandler.DirectionID dirID,
                                           boolean invisible)

readRelationType

public static IDHandler.RelationTypeParse readRelationType(ReadBuffer in)

writeInlineRelationType

public static void writeInlineRelationType(WriteBuffer out,
                                           long relationTypeId)

readInlineRelationType

public static long readInlineRelationType(ReadBuffer in)

getBounds

public static StaticBuffer[] getBounds(RelationCategory type,
                                       boolean systemTypes)