org.neo4j.graphdb

Interface Path

All Superinterfaces:

Iterable<PropertyContainer>

All Known Subinterfaces:

TraversalBranch

public interface Path
extends Iterable<PropertyContainer>

Represents a path in the graph. A path starts with a node followed by pairs of Relationship and Node objects. The shortest path is of length 0. Such a path contains only one node and no relationships. During a traversal Path instances are emitted where the current position of the traverser is represented by each such path. The current node in such a traversal is reached via endNode().

Method Summary

Modifier and Type	Method and Description
Node	endNode() Returns the end node of this path.
Iterator<PropertyContainer>	iterator() Iterates through both the Nodes and Relationships of this path in order.
Relationship	lastRelationship() Returns the last Relationship in this path.
int	length() Returns the length of this path.
Iterable<Node>	nodes() Returns all the nodes in this path starting from the start node going forward towards the end node.
Iterable<Relationship>	relationships() Returns all the relationships in between the nodes which this path consists of.
Iterable<Node>	reverseNodes() Returns all the nodes in this path in reversed order, i.e.
Iterable<Relationship>	reverseRelationships() Returns all the relationships in between the nodes which this path consists of in reverse order, i.e.
Node	startNode() Returns the start node of this path.
String	toString() Returns a natural string representation of this path.

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Method Detail

startNode

Node startNode()

Returns the start node of this path. It's also the first node returned from the nodes() iterable.

Returns:

the start node.

endNode

Node endNode()

Returns the end node of this path. It's also the last node returned from nodes() iterable. If the length() of this path is 0 the end node returned by this method is the same as the start node. If a path is emitted from a traverser the end node is the current node where the traverser is at the moment.

Returns:

the end node.

lastRelationship

Relationship lastRelationship()

Returns the last Relationship in this path.

Returns:

the last Relationship in this path, or null if this path contains no Relationships.

relationships

Iterable<Relationship> relationships()

Returns all the relationships in between the nodes which this path consists of. For a path with length() 0 this will be an empty Iterable.

Returns:

the relationships in this path.

reverseRelationships

Iterable<Relationship> reverseRelationships()

Returns all the relationships in between the nodes which this path consists of in reverse order, i.e. starting from the lastRelationship() going backwards towards the first relationship in the path. For a path with length() 0 this will be an empty Iterable.

Returns:

the relationships in this path in reverse order.

nodes

Iterable<Node> nodes()

Returns all the nodes in this path starting from the start node going forward towards the end node. The first node is the same as startNode() and the last node is the same as endNode(). In between those nodes there can be an arbitrary number of nodes. The shortest path possible is just one node, where also the the start node is the same as the end node.

Returns:

the nodes in this path.

reverseNodes

Iterable<Node> reverseNodes()

Returns all the nodes in this path in reversed order, i.e. starting from the end node going backwards instead of from the start node going forwards. The first node is the same as endNode() and the last node is the same as startNode(). In between those nodes there can be an arbitrary number of nodes. The shortest path possible is just one node, where also the the start node is the same as the end node.

Returns:

the nodes in this path starting from the end node going backwards towards the start node.

length

int length()

Returns the length of this path. That is the number of relationships (which is the same as the number of nodes minus one). The shortest path possible is of length 0.

Returns:

the length (i.e. the number of relationships) in the path.

toString

String toString()

Returns a natural string representation of this path. The string representation shows the nodes with relationships (and their directions) in between them.

Overrides:

toString in class Object

Returns:

A string representation of the path.

iterator

Iterator<PropertyContainer> iterator()

Iterates through both the Nodes and Relationships of this path in order. Interleaving Nodes with Relationships, starting and ending with a Node (the startNode() and endNode() respectively).

Specified by:

iterator in interface Iterable<PropertyContainer>

See Also:

Iterable.iterator()