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

Class EmptyGraphGenerator<V,​E>

  • Type Parameters:
    V - the graph vertex type
    E - the graph edge type
    All Implemented Interfaces:
    GraphGenerator<V,​E,​V>
    public class EmptyGraphGenerator<V,​E>
extends java.lang.Object
implements GraphGenerator<V,​E,​V>
    Generates an empty graph of any size. An empty graph is a graph that has no edges.
    Author:
    John V. Sichi

    • Constructor Summary

      Constructors 
      Constructor Description
      EmptyGraphGenerator​(int size)
      Construct a new EmptyGraphGenerator.

    • 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

    • Constructor Detail

      • EmptyGraphGenerator

        public EmptyGraphGenerator​(int size)
        Construct a new EmptyGraphGenerator.
        Parameters:
        size - number of vertices to be generated
        Throws:
        java.lang.IllegalArgumentException - if the specified size 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)