Package org.apache.tinkerpop.gremlin.process.traversal.step.util

Class EmptyPath

java.lang.Object

org.apache.tinkerpop.gremlin.process.traversal.step.util.EmptyPath

All Implemented Interfaces:

Serializable, Cloneable, Iterable<Object>, Path

public final class EmptyPath
extends Object
implements Path, Serializable

Author:

Marko A. Rodriguez (http://markorodriguez.com)

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.tinkerpop.gremlin.process.traversal.Path

Path.Exceptions

Method Summary

Modifier and Type	Method	Description
EmptyPath	clone()
boolean	equals(Object object)
Path	extend(Object object, Set<String> labels)	Add a new step to the path with an object and any number of associated labels.
Path	extend(Set<String> labels)	Add labels to the head of the path.
<A> A	get(int index)	Get the object associated with the specified index into the path.
<A> A	get(String label)	Get the object associated with the particular label of the path.
int	hashCode()
boolean	hasLabel(String label)	Return true if the path has the specified label, else return false.
static Path	instance()
boolean	isSimple()	Determines whether the path is a simple or not.
List<Set<String>>	labels()	An ordered list of the labels associated with the path The set of labels for a particular step are ordered by the order in which Path.extend(Object, Set) was called.
List<Object>	objects()	An ordered list of the objects in the path.
Path	retract(Set<String> labels)	Remove labels from path.
int	size()	Get the number of step in the path.
String	toString()

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.Path

forEach, get, head, isEmpty, iterator, popEquals, stream, subPath

Method Detail

size

public int size()

Description copied from interface: Path

Get the number of step in the path.

Specified by:

size in interface Path

Returns:

the size of the path

extend

public Path extend(Object object,
                   Set<String> labels)

Description copied from interface: Path

Add a new step to the path with an object and any number of associated labels.

Specified by:

extend in interface Path

Parameters:

object - the new head of the path

labels - the labels at the head of the path

Returns:

the extended path

extend

public Path extend(Set<String> labels)

Description copied from interface: Path

Add labels to the head of the path.

Specified by:

extend in interface Path

Parameters:

labels - the labels at the head of the path

Returns:

the path with added labels

retract

public Path retract(Set<String> labels)

Description copied from interface: Path

Remove labels from path.

Specified by:

retract in interface Path

Parameters:

labels - the labels to remove

Returns:

the path with removed labels

get

public <A> A get(String label)

Description copied from interface: Path

Get the object associated with the particular label of the path. If the path as multiple labels of the type, then return a List of those objects.

Specified by:

get in interface Path

Type Parameters:

A - the type of the object associated with the label

Parameters:

label - the label of the path

Returns:

the object associated with the label of the path

get

public <A> A get(int index)

Description copied from interface: Path

Get the object associated with the specified index into the path.

Specified by:

get in interface Path

Type Parameters:

A - the type of the object associated with the index

Parameters:

index - the index of the path

Returns:

the object associated with the index of the path

hasLabel

public boolean hasLabel(String label)

Description copied from interface: Path

Return true if the path has the specified label, else return false.

Specified by:

hasLabel in interface Path

Parameters:

label - the label to search for

Returns:

true if the label exists in the path

objects

public List<Object> objects()

Description copied from interface: Path

An ordered list of the objects in the path.

Specified by:

objects in interface Path

Returns:

the objects of the path

labels

public List<Set<String>> labels()

Description copied from interface: Path

An ordered list of the labels associated with the path The set of labels for a particular step are ordered by the order in which Path.extend(Object, Set) was called.

Specified by:

labels in interface Path

Returns:

the labels of the path

isSimple

public boolean isSimple()

Description copied from interface: Path

Determines whether the path is a simple or not. A simple path has no cycles and thus, no repeated objects.

Specified by:

isSimple in interface Path

Returns:

Whether the path is simple or not

clone

public EmptyPath clone()

Specified by:

clone in interface Path

Overrides:

clone in class Object

instance

public static Path instance()

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object object)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object