Package org._3pq.jgrapht.alg
Class CycleDetector
- java.lang.Object
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- org._3pq.jgrapht.alg.CycleDetector
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public class CycleDetector extends java.lang.Object
Performs cycle detection on a graph. The inspected graph is specified at construction time and cannot be modified. Currently, the detector supports only directed graphs.- Since:
- Sept 16, 2004
- Author:
- John V. Sichi
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Constructor Summary
Constructors Constructor Description CycleDetector(DirectedGraph graph)
Creates a cycle detector for the specified graph.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
detectCycles()
Performs yes/no cycle detection on the entire graph.boolean
detectCyclesContainingVertex(java.lang.Object v)
Performs yes/no cycle detection on an individual vertex.java.util.Set
findCycles()
Finds the vertex set for the subgraph of all cycles.java.util.Set
findCyclesContainingVertex(java.lang.Object v)
Finds the vertex set for the subgraph of all cycles which contain a particular vertex.
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Constructor Detail
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CycleDetector
public CycleDetector(DirectedGraph graph)
Creates a cycle detector for the specified graph. Currently only directed graphs are supported.- Parameters:
graph
- the DirectedGraph in which to detect cycles
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Method Detail
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detectCycles
public boolean detectCycles()
Performs yes/no cycle detection on the entire graph.- Returns:
- true iff the graph contains at least one cycle
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detectCyclesContainingVertex
public boolean detectCyclesContainingVertex(java.lang.Object v)
Performs yes/no cycle detection on an individual vertex.- Parameters:
v
- the vertex to test- Returns:
- true if v is on at least one cycle
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findCycles
public java.util.Set findCycles()
Finds the vertex set for the subgraph of all cycles.- Returns:
- set of all vertices which participate in at least one cycle in this graph
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findCyclesContainingVertex
public java.util.Set findCyclesContainingVertex(java.lang.Object v)
Finds the vertex set for the subgraph of all cycles which contain a particular vertex.- Parameters:
v
- the vertex to test- Returns:
- set of all vertices reachable from v via at least one cycle
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