V
 the graph vertex typeE
 the graph edge typepublic class AsUndirectedGraph<V,E> extends GraphDelegator<V,E> implements Serializable, UndirectedGraph<V,E>
UnsupportedOperationException
, but vertex addition/removal and edge removal are all
supported (and immediately reflected in the backing graph).
Note that edges returned by this graph's accessors are really just the edges of the underlying directed graph. Since there is no interface distinction between directed and undirected edges, this detail should be irrelevant to algorithms.
This graph does not pass the hashCode and equals operations through to the backing graph, but relies on Object's equals and hashCode methods. This graph will be serializable if the backing graph is serializable.
DEFAULT_EDGE_WEIGHT
Constructor and Description 

AsUndirectedGraph(Graph<V,E> g)
Constructor for AsUndirectedGraph.

Modifier and Type  Method and Description 

E 
addEdge(V sourceVertex,
V targetVertex)
Creates a new edge in this graph, going from the source vertex to the target vertex, and
returns the created edge.

boolean 
addEdge(V sourceVertex,
V targetVertex,
E e)
Adds the specified edge to this graph, going from the source vertex to the target vertex.

int 
degreeOf(V vertex)
Returns the degree of the specified vertex.

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.

GraphType 
getType()
Get the graph type.

Set<E> 
incomingEdgesOf(V vertex)
Returns a set of all edges incoming into the specified vertex.

int 
inDegreeOf(V vertex)
Returns the "in degree" of the specified vertex.

int 
outDegreeOf(V vertex)
Returns the "out degree" of the specified vertex.

Set<E> 
outgoingEdgesOf(V vertex)
Returns a set of all edges outgoing from the specified vertex.

String 
toString()
Returns a string of the parenthesized pair (V, E) representing this G=(V,E) graph.

addVertex, containsEdge, containsVertex, edgeSet, edgesOf, getEdgeFactory, getEdgeSource, getEdgeTarget, getEdgeWeight, removeEdge, removeEdge, removeVertex, setEdgeWeight, vertexSet
assertVertexExist, containsEdge, equals, hashCode, removeAllEdges, removeAllEdges, removeAllEdges, removeAllVertices, toStringFromSets
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
addVertex, containsEdge, containsEdge, containsVertex, edgeSet, edgesOf, getEdgeFactory, getEdgeSource, getEdgeTarget, getEdgeWeight, removeAllEdges, removeAllEdges, removeAllVertices, removeEdge, removeEdge, removeVertex, setEdgeWeight, vertexSet
public AsUndirectedGraph(Graph<V,E> g)
g
 the backing directed graph over which an undirected view is to be created.IllegalArgumentException
 if the graph is not directedpublic Set<E> getAllEdges(V sourceVertex, V targetVertex)
null
, returns
null
. If both vertices exist but no edges found, returns an empty set.
In undirected graphs, some of the returned edges may have their source and target vertices in the opposite order. In simple graphs the returned set is either singleton set or empty set.
getAllEdges
in interface Graph<V,E>
getAllEdges
in class GraphDelegator<V,E>
sourceVertex
 source vertex of the edge.targetVertex
 target vertex of the edge.public E getEdge(V sourceVertex, V targetVertex)
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.
public E addEdge(V sourceVertex, V targetVertex)
null
.
The source and target vertices must already be contained in this graph. If they are not found in graph IllegalArgumentException is thrown.
This method creates the new edge e
using this graph's EdgeFactory
.
For the new edge to be added e
must not be equal to any other edge the
graph (even if the graph allows edgemultiplicity). More formally, the graph must not contain
any edge e2
such that e2.equals(e)
. If such
e2
is found then the newly created edge e
is abandoned, the method leaves
this graph unchanged returns
null
.
addEdge
in interface Graph<V,E>
addEdge
in class GraphDelegator<V,E>
sourceVertex
 source vertex of the edge.targetVertex
 target vertex of the edge.
null
.UnsupportedOperationException
 always, since operation is unsupportedGraph.getEdgeFactory()
public boolean addEdge(V sourceVertex, V targetVertex, E e)
e
, to this graph if this graph contains no edge e2
such that
e2.equals(e)
. If this graph already contains such an edge, the call leaves this
graph unchanged and returns false. Some graphs do not allow edgemultiplicity. In
such cases, if the graph already contains an edge from the specified source to the specified
target, than this method does not change the graph and returns
false
. If the edge was added to the graph, returns
true
.
The source and target vertices must already be contained in this graph. If they are not found in graph IllegalArgumentException is thrown.
addEdge
in interface Graph<V,E>
addEdge
in class GraphDelegator<V,E>
sourceVertex
 source vertex of the edge.targetVertex
 target vertex of the edge.e
 edge to be added to this graph.UnsupportedOperationException
 always, since operation is unsupportedGraph.addEdge(Object, Object)
,
Graph.getEdgeFactory()
public int degreeOf(V vertex)
public Set<E> incomingEdgesOf(V vertex)
In the case of undirected graphs this method returns all edges touching the vertex, thus, some of the returned edges may have their source and target vertices in the opposite order.
incomingEdgesOf
in interface Graph<V,E>
incomingEdgesOf
in class GraphDelegator<V,E>
vertex
 the vertex for which the list of incoming edges to be returned.public int inDegreeOf(V vertex)
The "in degree" of a vertex in a directed graph is the number of inward directed edges from that vertex. See http://mathworld.wolfram.com/Indegree.html.
In the case of undirected graphs this method returns the number of edges touching the vertex. Edges with same source and target vertices (selfloops) are counted twice.
inDegreeOf
in interface Graph<V,E>
inDegreeOf
in class GraphDelegator<V,E>
vertex
 vertex whose degree is to be calculated.public Set<E> outgoingEdgesOf(V vertex)
In the case of undirected graphs this method returns all edges touching the vertex, thus, some of the returned edges may have their source and target vertices in the opposite order.
outgoingEdgesOf
in interface Graph<V,E>
outgoingEdgesOf
in class GraphDelegator<V,E>
vertex
 the vertex for which the list of outgoing edges to be returned.public int outDegreeOf(V vertex)
The "out degree" of a vertex in a directed graph is the number of outward directed edges from that vertex. See http://mathworld.wolfram.com/Outdegree.html.
In the case of undirected graphs this method returns the number of edges touching the vertex. Edges with same source and target vertices (selfloops) are counted twice.
outDegreeOf
in interface Graph<V,E>
outDegreeOf
in class GraphDelegator<V,E>
vertex
 vertex whose degree is to be calculated.public GraphType getType()
public String toString()
toString
in class GraphDelegator<V,E>
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