Package org._3pq.jgrapht.generate
Class WheelGraphGenerator
- java.lang.Object
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- org._3pq.jgrapht.generate.WheelGraphGenerator
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- All Implemented Interfaces:
GraphGenerator
public class WheelGraphGenerator extends java.lang.Object implements GraphGenerator
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".- Since:
- Sep 16, 2003
- Author:
- John V. Sichi
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Field Summary
Fields Modifier and Type Field Description static java.lang.String
HUB_VERTEX
Role for the hub vertex.
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Constructor Summary
Constructors Constructor Description WheelGraphGenerator(int size)
Creates a new WheelGraphGenerator object.WheelGraphGenerator(int size, boolean inwardSpokes)
Construct a new WheelGraphGenerator.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
generateGraph(Graph target, VertexFactory vertexFactory, java.util.Map resultMap)
Generate a graph structure.
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Field Detail
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HUB_VERTEX
public static final java.lang.String HUB_VERTEX
Role for the hub vertex.- See Also:
- Constant Field Values
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Constructor Detail
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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.
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WheelGraphGenerator
public WheelGraphGenerator(int size, boolean inwardSpokes)
Construct a new WheelGraphGenerator.- Parameters:
size
- number of vertices to be generated.inwardSpokes
- iftrue
and graph is directed, spokes are oriented from rim to hub; else from hub to rim.- Throws:
java.lang.IllegalArgumentException
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Method Detail
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generateGraph
public void generateGraph(Graph target, VertexFactory vertexFactory, java.util.Map 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 interfaceGraphGenerator
- 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 elementsvertexFactory
- called to produce new verticesresultMap
- if non-null, receives implementation-specific mappings from String roles to graph elements (or collections of graph elements)
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