org.jgrapht.alg.cycle

## Class HawickJamesSimpleCycles<V,E>

• Type Parameters:
V - the vertex type.
E - the edge type.
All Implemented Interfaces:
DirectedSimpleCycles<V,E>

public class HawickJamesSimpleCycles<V,E>
extends Object
implements DirectedSimpleCycles<V,E>
Find all simple cycles of a directed graph using the algorithm described by Hawick and James.

See:
K. A. Hawick, H. A. James. Enumerating Circuits and Loops in Graphs with Self-Arcs and Multiple-Arcs. Computational Science Technical Note CSTN-013, 2008

Author:
Luiz Kill
• ### Constructor Summary

Constructors
Constructor and Description
HawickJamesSimpleCycles()
Create a simple cycle finder with an unspecified graph.
HawickJamesSimpleCycles(Graph<V,E> graph)
Create a simple cycle finder for the specified graph.
• ### Method Summary

All Methods
Modifier and Type Method and Description
long countSimpleCycles()
Count the number of simple cycles.
List<List<V>> findSimpleCycles()
Find the simple cycles of the graph.
Graph<V,E> getGraph()
Get the graph
void printSimpleCycles()
Print to the standard output all simple cycles without building a list to keep them, thus avoiding high memory consumption when investigating large and much connected graphs.
void setGraph(Graph<V,E> graph)
Set the graph
• ### Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
• ### Constructor Detail

• #### HawickJamesSimpleCycles

public HawickJamesSimpleCycles()
Create a simple cycle finder with an unspecified graph.
• #### HawickJamesSimpleCycles

public HawickJamesSimpleCycles(Graph<V,E> graph)
throws IllegalArgumentException
Create a simple cycle finder for the specified graph.
Parameters:
graph - the DirectedGraph in which to find cycles.
Throws:
IllegalArgumentException - if the graph argument is  null.
• ### Method Detail

• #### getGraph

public Graph<V,E> getGraph()
Get the graph
Returns:
graph
• #### setGraph

public void setGraph(Graph<V,E> graph)
Set the graph
Parameters:
graph - graph
• #### findSimpleCycles

public List<List<V>> findSimpleCycles()
throws IllegalArgumentException
Find the simple cycles of the graph.
Specified by:
findSimpleCycles in interface DirectedSimpleCycles<V,E>
Returns:
The list of all simple cycles. Possibly empty but never null.
Throws:
IllegalArgumentException
• #### printSimpleCycles

public void printSimpleCycles()
Print to the standard output all simple cycles without building a list to keep them, thus avoiding high memory consumption when investigating large and much connected graphs.
• #### countSimpleCycles

public long countSimpleCycles()
Count the number of simple cycles. It can count up to Long.MAX cycles in a graph.
Returns:
the number of simple cycles