org.jgrapht.generate

Class WindmillGraphsGenerator<V,E>

java.lang.Object

org.jgrapht.generate.WindmillGraphsGenerator<V,E>

Type Parameters:

V - graph vertex type

E - graph edge type

All Implemented Interfaces:

GraphGenerator<V,E,V>

public class WindmillGraphsGenerator<V,E>
extends Object
implements GraphGenerator<V,E,V>

Generator for Windmill Graphs, Dutch Windmill Graphs and Friendship Graphs.

The windmill graph $W_n^{(m)}$ is the graph obtained by taking $m$ copies of the complete graph $K_n$ with a vertex in common. The Dutch windmill graph $D_n^{(m)}$, is the graph obtained by taking $m$ copies of the cycle graph $C_3$ with a vertex in common. For the special case where $n=3$, $D_n^{(m)}$ and $W_n^{(m)}$ are identical. The class of graphs $D_3^{(m)}$ is sometimes referred to as the Friendship graph, denoted by $F_m$.

Author:

Joris Kinable

Constructor Summary

Constructors

Constructor and Description
WindmillGraphsGenerator(org.jgrapht.generate.WindmillGraphsGenerator.Mode mode, int m, int n) Constructs a GeneralizedPetersenGraphGenerator used to generate a Generalized Petersen graphs $GP(n,k)$.

Method Summary

Modifier and Type	Method and Description
void	generateGraph(Graph<V,E> target, VertexFactory<V> vertexFactory, Map<String,V> resultMap) Generate a graph structure.

Methods inherited from class java.lang.Object

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

Constructor Detail

WindmillGraphsGenerator

public WindmillGraphsGenerator(org.jgrapht.generate.WindmillGraphsGenerator.Mode mode,
                               int m,
                               int n)

Constructs a GeneralizedPetersenGraphGenerator used to generate a Generalized Petersen graphs $GP(n,k)$.

Parameters:

mode - indicate whether the generator should generate Windmill graphs or Dutch Windmill graphs

m - number of copies of $C_n$ (Dutch Windmill graph) or $K_n$ (Windmill graph)

n - size of $C_n$ (Dutch Windmill graph) or $K_n$ (Windmill graph). To generate friendship graphs, set $n=3$ (the mode is irrelevant).

Method Detail

generateGraph

public void generateGraph(Graph<V,E> target,
                          VertexFactory<V> vertexFactory,
                          Map<String,V> resultMap)

Description copied from interface: GraphGenerator

Generate a graph structure. The topology of the generated graph is dependent on the implementation. For graphs in which not all vertices share the same automorphism equivalence class, the generator may produce a labeling indicating the roles played by generated elements. This is the purpose of the resultMap parameter. For example, a generator for a wheel graph would designate a hub vertex. Role names used as keys in resultMap should be declared as public static final Strings by implementation classes.

Specified by:

generateGraph in interface GraphGenerator<V,E,V>

Parameters:

target - receives the generated edges and vertices; if this is non-empty on entry, the result will be a disconnected graph since generated elements will not be connected to existing elements

vertexFactory - called to produce new vertices

resultMap - if non-null, receives implementation-specific mappings from String roles to graph elements (or collections of graph elements)