org.jgrapht.graph.specifics

Class FastLookupUndirectedSpecifics<V,E>

java.lang.Object

org.jgrapht.graph.specifics.Specifics<V,E>

org.jgrapht.graph.specifics.UndirectedSpecifics<V,E>

org.jgrapht.graph.specifics.FastLookupUndirectedSpecifics<V,E>

Type Parameters:

V - the graph vertex type

E - the graph edge type

All Implemented Interfaces:

Serializable

public class FastLookupUndirectedSpecifics<V,E>
extends UndirectedSpecifics<V,E>
implements Serializable

Fast implementation of UndirectedSpecifics. This class uses additional data structures to improve the performance of methods which depend on edge retrievals, e.g. getEdge(V u, V v), containsEdge(V u, V v),addEdge(V u, V v). A disadvantage is an increase in memory consumption. If memory utilization is an issue, use a DirectedSpecifics instead.

Author:

Joris Kinable

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<VertexPair<V>,ArrayUnenforcedSet<E>>	touchingVerticesToEdgeMap

Fields inherited from class org.jgrapht.graph.specifics.UndirectedSpecifics

abstractBaseGraph, edgeSetFactory, vertexMapUndirected

Constructor Summary

Constructors

Constructor and Description
FastLookupUndirectedSpecifics(AbstractBaseGraph<V,E> abstractBaseGraph) Construct a new fast lookup undirected specifics.
FastLookupUndirectedSpecifics(AbstractBaseGraph<V,E> abstractBaseGraph, Map<V,UndirectedEdgeContainer<V,E>> vertexMap) Construct a new fast lookup undirected specifics.

Method Summary

Modifier and Type	Method and Description
void	addEdgeToTouchingVertices(E e) Adds the specified edge to the edge containers of its source and target vertices.
Set<E>	getAllEdges(V sourceVertex, V targetVertex) Returns a set of all edges connecting source vertex to target vertex if such vertices exist in this graph.
E	getEdge(V sourceVertex, V targetVertex) Returns an edge connecting source vertex to target vertex if such vertices and such edge exist in this graph.
void	removeEdgeFromTouchingVertices(E e) Removes the specified edge from the edge containers of its source and target vertices.

Methods inherited from class org.jgrapht.graph.specifics.UndirectedSpecifics

addVertex, degreeOf, edgesOf, getEdgeContainer, getVertexSet, incomingEdgesOf, inDegreeOf, outDegreeOf, outgoingEdgesOf

Methods inherited from class java.lang.Object

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

Field Detail

touchingVerticesToEdgeMap

protected Map<VertexPair<V>,ArrayUnenforcedSet<E>> touchingVerticesToEdgeMap

Constructor Detail

FastLookupUndirectedSpecifics

public FastLookupUndirectedSpecifics(AbstractBaseGraph<V,E> abstractBaseGraph)

Construct a new fast lookup undirected specifics.

Parameters:

abstractBaseGraph - the graph for which these specifics are for

FastLookupUndirectedSpecifics

public FastLookupUndirectedSpecifics(AbstractBaseGraph<V,E> abstractBaseGraph,
                                     Map<V,UndirectedEdgeContainer<V,E>> vertexMap)

Construct a new fast lookup undirected specifics.

Parameters:

abstractBaseGraph - the graph for which these specifics are for

vertexMap - a container to use for the edges

Method Detail

getAllEdges

public Set<E> getAllEdges(V sourceVertex,
                          V targetVertex)

Returns a set of all edges connecting source vertex to target vertex if such vertices exist in this graph. If any of the vertices does not exist or is null, returns null. If both vertices exist but no edges found, returns an empty set.

Overrides:

getAllEdges in class UndirectedSpecifics<V,E>

Parameters:

sourceVertex - source vertex of the edge.

targetVertex - target vertex of the edge.

Returns:

a set of all edges connecting source vertex to target vertex.

getEdge

public E getEdge(V sourceVertex,
                 V targetVertex)

Returns an edge connecting source vertex to target vertex if such vertices and such edge exist in this graph. Otherwise returns null. If any of the specified vertices is null returns null

In undirected graphs, the returned edge may have its source and target vertices in the opposite order.

Overrides:

getEdge in class UndirectedSpecifics<V,E>

Parameters:

sourceVertex - source vertex of the edge.

targetVertex - target vertex of the edge.

Returns:

an edge connecting source vertex to target vertex.

addEdgeToTouchingVertices

public void addEdgeToTouchingVertices(E e)

Adds the specified edge to the edge containers of its source and target vertices.

Overrides:

addEdgeToTouchingVertices in class UndirectedSpecifics<V,E>

Parameters:

e - the edge

removeEdgeFromTouchingVertices

public void removeEdgeFromTouchingVertices(E e)

Removes the specified edge from the edge containers of its source and target vertices.

Overrides:

removeEdgeFromTouchingVertices in class UndirectedSpecifics<V,E>

Parameters:

e - the edge