public class StrongConnectivityInspector
extends java.lang.Object
Complements the ConnectivityInspector
class
with the capability to compute the strongly connected components of a
directed graph. The algorithm is implemented after "Corman et al:
Introduction to agorithms", Chapter 25.2. It has a running time of O(V +
E).
Unlike ConnectivityInspector
, this class does
not implement incremental inspection. The full algorithm is executed at the
first call of stronglyConnectedSets()
or isStronglyConnected()
.
Constructor and Description |
---|
StrongConnectivityInspector(DirectedGraph directedGraph)
The constructor of the StrongConnectivityInspector class.
|
Modifier and Type | Method and Description |
---|---|
DirectedGraph |
getGraph()
Returns the graph inspected by the StrongConnectivityInspector.
|
boolean |
isStronglyConnected()
Returns true if the graph of this
StronglyConnectivityInspector instance is strongly
connected. |
java.util.List |
stronglyConnectedSets()
Computes a
List of Set s, where each set contains
vertices which together form a strongly connected component within the
given graph. |
java.util.List |
stronglyConnectedSubgraphs()
Computes a list of
DirectedSubgraph s of the given graph. |
public StrongConnectivityInspector(DirectedGraph directedGraph)
directedGraph
- the graph to inspectjava.lang.IllegalArgumentException
public DirectedGraph getGraph()
public boolean isStronglyConnected()
StronglyConnectivityInspector
instance is strongly
connected.public java.util.List stronglyConnectedSets()
List
of Set
s, where each set contains
vertices which together form a strongly connected component within the
given graph.List
of Set
s containing the strongly
connected componentspublic java.util.List stronglyConnectedSubgraphs()
Computes a list of DirectedSubgraph
s of the given graph. Each
subgraph will represent a strongly connected component and will contain
all vertices of that component. The subgraph will have an edge (u,v)
iff u and v are contained in the strongly connected component.
NOTE: Calling this method will first execute stronglyConnectedSets()
. If you don't need
subgraphs, use that method.