edu.uci.ics.jung.algorithms.transformation

Class VertexPartitionCollapser<V,E,CV,CE>

java.lang.Object

edu.uci.ics.jung.algorithms.transformation.VertexPartitionCollapser<V,E,CV,CE>

public class VertexPartitionCollapser<V,E,CV,CE>
extends java.lang.Object

This class transforms a graph with a known vertex partitioning into a graph whose vertices correspond to the input graph's partitions. Two vertices in the output graph are connected if and only if there exists at least one edge between vertices in the corresponding partitions of the input graph. If the output graph permits parallel edges, there will be an edge connecting two vertices in the new graph for each such edge connecting constituent vertices in the input graph.

Concept based on Danyel Fisher's GraphCollapser in JUNG 1.x.

Constructor Summary

Constructors

Constructor and Description
VertexPartitionCollapser(com.google.common.base.Supplier<Graph<CV,CE>> graph_factory, com.google.common.base.Supplier<CV> vertex_factory, com.google.common.base.Supplier<CE> edge_factory) Creates an instance with the specified graph and element factories.

Method Summary

Modifier and Type	Method and Description
Graph<CV,CE>	collapseVertexPartitions(VertexPartition<V,E> partitioning) Creates a new graph whose vertices correspond to the partitions of the supplied graph.
com.google.common.base.Function<java.util.Set<V>,CV>	getSetToCollapsedVertexTransformer()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

VertexPartitionCollapser

public VertexPartitionCollapser(com.google.common.base.Supplier<Graph<CV,CE>> graph_factory,
                                com.google.common.base.Supplier<CV> vertex_factory,
                                com.google.common.base.Supplier<CE> edge_factory)

Creates an instance with the specified graph and element factories.

Parameters:

vertex_factory - used to construct the vertices of the new graph

edge_factory - used to construct the edges of the new graph

graph_factory - used to construct the new graph

Method Detail

collapseVertexPartitions

public Graph<CV,CE> collapseVertexPartitions(VertexPartition<V,E> partitioning)

Creates a new graph whose vertices correspond to the partitions of the supplied graph.

Parameters:

partitioning - a vertex partition of a graph

Returns:

a new graph whose vertices correspond to the partitions of the supplied graph

getSetToCollapsedVertexTransformer

public com.google.common.base.Function<java.util.Set<V>,CV> getSetToCollapsedVertexTransformer()

Returns:

a Function from vertex sets in the original graph to collapsed vertices in the transformed graph.