Module org.jgrapht.core
Package org.jgrapht.generate

Class WheelGraphGenerator<V,E>

java.lang.Object
org.jgrapht.generate.WheelGraphGenerator<V,E>
Type Parameters:
V - the graph vertex type
E - the graph edge type
All Implemented Interfaces:
GraphGenerator<V,E,V>
public class WheelGraphGenerator<V,E> extends Object implements GraphGenerator<V,E,V>
Generates a wheel graph of any size. Reminding a bicycle wheel, a wheel graph has a hub vertex in the center and a rim of vertices around it that are connected to each other (as a ring). The rim vertices are also connected to the hub with edges that are called "spokes".
Author:
John V. Sichi

  • Field Details

  • Constructor Details

    • WheelGraphGenerator

      public WheelGraphGenerator(int size)
      Creates a new WheelGraphGenerator object. This constructor is more suitable for undirected graphs, where spokes' direction is meaningless. In the directed case, spokes will be oriented from rim to hub.
      Parameters:
      size - number of vertices to be generated.

    • WheelGraphGenerator

      public WheelGraphGenerator(int size, boolean inwardSpokes)
      Construct a new WheelGraphGenerator.
      Parameters:
      size - number of vertices to be generated.
      inwardSpokes - if true and graph is directed, spokes are oriented from rim to hub; else from hub to rim.
      Throws:
      IllegalArgumentException - in case the number of vertices is negative

  • Method Details

    • generateGraph

      public void generateGraph(Graph<V,E> target, Map<String,V> resultMap)
      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
      resultMap - if non-null, receives implementation-specific mappings from String roles to graph elements (or collections of graph elements)