org.janusgraph.core

Enum Multiplicity

java.lang.Object

java.lang.Enum<Multiplicity>

org.janusgraph.core.Multiplicity

All Implemented Interfaces:

Serializable, Comparable<Multiplicity>

public enum Multiplicity
extends Enum<Multiplicity>

The multiplicity of edges between vertices for a given label. Multiplicity here is understood in the same sense as for UML class diagrams https://en.wikipedia.org/wiki/Class_diagram#Multiplicity

Author:

Matthias Broecheler ([email protected])

Enum Constant Summary

Enum Constants

Enum Constant and Description
MANY2ONE There can only be a single out-edge of this label for a given vertex but multiple in-edges (i.e.
MULTI The given edge label specifies a multi-graph, meaning that the multiplicity is not constrained and that there may be multiple edges of this label between any given pair of vertices.
ONE2MANY There can only be a single in-edge of this label for a given vertex but multiple out-edges (i.e.
ONE2ONE There can be only a single in and out-edge of this label for a given vertex (i.e.
SIMPLE The given edge label specifies a simple graph, meaning that the multiplicity is not constrained but that there can only be at most a single edge of this label between a given pair of vertices.

Method Summary

Modifier and Type	Method and Description
static Multiplicity	convert(Cardinality cardinality)
static Multiplicity	convert(org.apache.tinkerpop.gremlin.structure.VertexProperty.Cardinality cardinality)
Cardinality	getCardinality()
boolean	isConstrained() Whether this multiplicity imposes any constraint on the number of edges that may exist between a pair of vertices.
boolean	isConstrained(org.apache.tinkerpop.gremlin.structure.Direction direction)
boolean	isUnique(org.apache.tinkerpop.gremlin.structure.Direction direction) If this multiplicity implies edge uniqueness in the given direction for any given vertex.
static Multiplicity	valueOf(String name) Returns the enum constant of this type with the specified name.
static Multiplicity[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

MULTI

public static final Multiplicity MULTI

The given edge label specifies a multi-graph, meaning that the multiplicity is not constrained and that there may be multiple edges of this label between any given pair of vertices. https://en.wikipedia.org/wiki/Multigraph

SIMPLE

public static final Multiplicity SIMPLE

The given edge label specifies a simple graph, meaning that the multiplicity is not constrained but that there can only be at most a single edge of this label between a given pair of vertices.

ONE2MANY

public static final Multiplicity ONE2MANY

There can only be a single in-edge of this label for a given vertex but multiple out-edges (i.e. in-unique)

MANY2ONE

public static final Multiplicity MANY2ONE

There can only be a single out-edge of this label for a given vertex but multiple in-edges (i.e. out-unique)

ONE2ONE

public static final Multiplicity ONE2ONE

There can be only a single in and out-edge of this label for a given vertex (i.e. unique in both directions).

Method Detail

values

public static Multiplicity[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (Multiplicity c : Multiplicity.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static Multiplicity valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

isConstrained

public boolean isConstrained()

Whether this multiplicity imposes any constraint on the number of edges that may exist between a pair of vertices.

Returns:

isConstrained

public boolean isConstrained(org.apache.tinkerpop.gremlin.structure.Direction direction)

isUnique

public boolean isUnique(org.apache.tinkerpop.gremlin.structure.Direction direction)

If this multiplicity implies edge uniqueness in the given direction for any given vertex.

Parameters:

direction -

Returns:

convert

public static Multiplicity convert(Cardinality cardinality)

convert

public static Multiplicity convert(org.apache.tinkerpop.gremlin.structure.VertexProperty.Cardinality cardinality)

getCardinality

public Cardinality getCardinality()