Package org.jgrapht.generate

Class 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 java.lang.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 Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.String HUB_VERTEX
      Role for the hub vertex.

    • Constructor Summary

      Constructors 
      Constructor Description
      WheelGraphGenerator​(int size)
      Creates a new WheelGraphGenerator object.
      WheelGraphGenerator​(int size, boolean inwardSpokes)
      Construct a new WheelGraphGenerator.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void generateGraph​(Graph<V,​E> target, java.util.Map<java.lang.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

    • Field Detail

      • HUB_VERTEX

        public static final java.lang.String HUB_VERTEX
        Role for the hub vertex.
        See Also:
        Constant Field Values

    • Constructor Detail

      • 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:
        java.lang.IllegalArgumentException - in case the number of vertices is negative

    • Method Detail

      • generateGraph

        public void generateGraph​(Graph<V,​E> target,
                          java.util.Map<java.lang.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)