Package org.apache.tinkerpop.gremlin.structure

Enum Direction

java.lang.Object

java.lang.Enum<Direction>

org.apache.tinkerpop.gremlin.structure.Direction

All Implemented Interfaces:

Serializable, Comparable<Direction>

public enum Direction
extends Enum<Direction>

Direction is used to denote the direction of an Edge or location of a Vertex on an Edge. For example:

 gremlin--knows-->rexster
 

is an OUT Edge for Gremlin and an IN edge for Rexster. Moreover, given that Edge, Gremlin is the OUT Vertex and Rexster is the IN Vertex.

Author:

Marko A. Rodriguez (http://markorodriguez.com), Stephen Mallette (http://stephen.genoprime.com)

Enum Constant Summary

Enum Constants

Enum Constant	Description
BOTH	Refers to either direction (IN or OUT).
IN	Refers to an incoming direction.
OUT	Refers to an outgoing direction.

Field Summary

Fields

Modifier and Type	Field	Description
static Direction	from	Friendly alias to OUT
static Direction[]	proper	The actual direction of an Edge may only be IN or OUT, as defined in this array.
static Direction	to	Friendly alias to IN

Method Summary

Modifier and Type	Method	Description
static Direction	directionValueOf(String name)	Get Direction from name.
Direction	opposite()	Produce the opposite representation of the current Direction enum.
static Direction	valueOf(String name)	Returns the enum constant of this type with the specified name.
static Direction[]	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

OUT

public static final Direction OUT

Refers to an outgoing direction.

Since:

3.0.0-incubating

IN

public static final Direction IN

Refers to an incoming direction.

Since:

3.0.0-incubating

BOTH

public static final Direction BOTH

Refers to either direction (IN or OUT).

Since:

3.0.0-incubating

Field Detail

proper

public static final Direction[] proper

The actual direction of an Edge may only be IN or OUT, as defined in this array.

Since:

3.0.0-incubating

from

public static final Direction from

Friendly alias to OUT

Since:

3.6.0

to

public static final Direction to

Friendly alias to IN

Since:

3.6.0

Method Detail

values

public static Direction[] 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 (Direction c : Direction.values())
    System.out.println(c);

Returns:

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

valueOf

public static Direction 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

opposite

public Direction opposite()

Produce the opposite representation of the current Direction enum.

directionValueOf

public static Direction directionValueOf(String name)

Get Direction from name.