com.sparsity.sparksee.algorithms

Class TraversalDFS

java.lang.Object

com.sparsity.sparksee.algorithms.Traversal

com.sparsity.sparksee.algorithms.TraversalDFS

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class TraversalDFS
extends Traversal

Depth-First Search (DFS) implementation of Traversal.

Starting from a source or root node, it visits as far as possible along each branch before backtracking.

Check out the 'Algorithms' section in the SPARKSEE User Manual for more details on this.

Author:

Sparsity Technologies http://www.sparsity-technologies.com

Constructor Summary

Constructors

Constructor and Description
TraversalDFS(Session session, long node) Creates a new instance.

Method Summary

Modifier and Type	Method and Description
void	addAllEdgeTypes(EdgesDirection dir) Allows for traversing all edge types of the graph.
void	addAllNodeTypes() Allows for traversing all node types of the graph.
void	addEdgeType(int type, EdgesDirection dir) Allows for traversing edges of the given type.
void	addNodeType(int type) Allows for traversing nodes of the given type.
void	excludeEdges(Objects edges) Set which edges can't be used.
void	excludeNodes(Objects nodes) Set which nodes can't be used.
int	getCurrentDepth() Returns the depth of the current node.
boolean	hasNext() Gets if there are more objects to be traversed.
long	next() Gets the next object of the traversal.
void	setMaximumHops(int maxhops) Sets the maximum hops restriction.

Methods inherited from class com.sparsity.sparksee.algorithms.Traversal

close, isClosed

Methods inherited from class java.lang.Object

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

Constructor Detail

TraversalDFS

public TraversalDFS(Session session,
                    long node)

Creates a new instance.

Parameters:

session - [in] Session to get the graph from and perform traversal.

node - [in] Node to start traversal from.

Method Detail

addEdgeType

public void addEdgeType(int type,
                        EdgesDirection dir)

Allows for traversing edges of the given type.

Overrides:

addEdgeType in class Traversal

Parameters:

type - [in] Edge type.

dir - [in] Edge direction.

excludeNodes

public void excludeNodes(Objects nodes)

Set which nodes can't be used.

This will replace any previously specified set of excluded nodes. Should only be used to exclude the usage of specific nodes from allowed node types because it's less efficient than not allowing a node type.

Overrides:

excludeNodes in class Traversal

Parameters:

nodes - [in] A set of node identifiers that must be kept intact until the destruction of the class.

addAllEdgeTypes

public void addAllEdgeTypes(EdgesDirection dir)

Allows for traversing all edge types of the graph.

Overrides:

addAllEdgeTypes in class Traversal

Parameters:

dir - [in] Edge direction.

addNodeType

public void addNodeType(int type)

Allows for traversing nodes of the given type.

Overrides:

addNodeType in class Traversal

Parameters:

type - The node type to add

excludeEdges

public void excludeEdges(Objects edges)

Set which edges can't be used.

This will replace any previously specified set of excluded edges. Should only be used to exclude the usage of specific edges from allowed edge types because it's less efficient than not allowing an edge type.

Overrides:

excludeEdges in class Traversal

Parameters:

edges - [in] A set of edge identifiers that must be kept intact until the destruction of the class.

next

public long next()

Gets the next object of the traversal.

Overrides:

next in class Traversal

Returns:

A node or edge identifier.

hasNext

public boolean hasNext()

Gets if there are more objects to be traversed.

Overrides:

hasNext in class Traversal

Returns:

TRUE if there are more objects, FALSE otherwise.

getCurrentDepth

public int getCurrentDepth()

Returns the depth of the current node.

That is, it returns the depth of the node returned in the last call to Next().

Overrides:

getCurrentDepth in class Traversal

Returns:

The depth of the current node.

addAllNodeTypes

public void addAllNodeTypes()

Allows for traversing all node types of the graph.

Overrides:

addAllNodeTypes in class Traversal

setMaximumHops

public void setMaximumHops(int maxhops)

Sets the maximum hops restriction.

All paths longer than the maximum hops restriction will be ignored.

Overrides:

setMaximumHops in class Traversal

Parameters:

maxhops - [in] The maximum hops restriction. It must be positive or zero. Zero, the default value, means unlimited.