Class RandomGraphGenerator<V,​E>

  • All Implemented Interfaces:
    GraphGenerator<V,​E,​V>

    public class RandomGraphGenerator<V,​E>
    extends java.lang.Object
    implements GraphGenerator<V,​E,​V>
    This Generator creates a random-topology graph of a specified number of vertexes and edges. An instance of this generator will always return the same graph-topology in calls to generateGraph(). The vertexes can be different (depends on the VertexFactory implementation)

    However, two instances which use the same constructor parameters will produce two different random graphs (note: as with any random generator, there is always a small possibility that two instances will create the same results).

    Since:
    Aug 6, 2005
    Author:
    Assaf Lehr
    • Field Detail

      • numOfVertexes

        protected int numOfVertexes
      • numOfEdges

        protected int numOfEdges
      • randomizer

        protected java.util.Random randomizer
    • Constructor Detail

      • RandomGraphGenerator

        public RandomGraphGenerator​(int aNumOfVertexes,
                                    int aNumOfEdges)
    • Method Detail

      • generateGraph

        public void generateGraph​(Graph<V,​E> target,
                                  VertexFactory<V> vertexFactory,
                                  java.util.Map<java.lang.String,​V> resultMap)
        (non-Javadoc)
        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)
        Throws:
        java.lang.IllegalArgumentException - if the aNumOfEdges passed in the constructor, cannot be created on a graph of the concrete type with aNumOfVertexes. org.jgrapht.generate.RandomGraphGenerator.DefaultEdgeTopologyFactory#isNumberOfEdgesValid(org.jgrapht.Graph, int)
        See Also:
        GraphGenerator.generateGraph(Graph, VertexFactory, Map)