org.jgrapht.generate

Class EmptyGraphGenerator<V,E>

java.lang.Object

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

All Implemented Interfaces:

GraphGenerator<V,E,V>

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

Generates an empty graph of any size. An empty graph is a graph that has no edges.

Since:

Sep 16, 2003

Author:

John V. Sichi

Constructor Summary

Constructors

Constructor and Description
EmptyGraphGenerator(int size) Construct a new EmptyGraphGenerator.

Method Summary

Methods

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

EmptyGraphGenerator

public EmptyGraphGenerator(int size)

Construct a new EmptyGraphGenerator.

Parameters:

size - number of vertices to be generated

Throws:

IllegalArgumentException - if the specified size is negative.

Method Detail

generateGraph

public void generateGraph(Graph<V,E> target,
                 VertexFactory<V> vertexFactory,
                 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

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)