com.graphhopper.routing.subnetwork

Class TarjansSCCAlgorithm

java.lang.Object

com.graphhopper.routing.subnetwork.TarjansSCCAlgorithm

public class TarjansSCCAlgorithm
extends Object

Implementation of Tarjan's algorithm using an explicit stack. The traditional recursive approach runs into stack overflow pretty quickly. The algorithm is used within GraphHopper to find strongly connected components to detect dead-ends leading to routes not found.

See http://en.wikipedia.org/wiki/Tarjan's_strongly_connected_components_algorithm. See http://www.timl.id.au/?p=327 and http://homepages.ecs.vuw.ac.nz/~djp/files/P05.pdf

Constructor Summary

Constructors

Constructor and Description
TarjansSCCAlgorithm(GraphHopperStorage ghStorage, EdgeFilter edgeFilter, boolean ignoreSingleEntries)

Method Summary

Modifier and Type	Method and Description
List<com.carrotsearch.hppc.IntArrayList>	findComponents() Find and return list of all strongly connected components in g.
GHBitSet	getIgnoreSet()

Methods inherited from class java.lang.Object

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

Constructor Detail

TarjansSCCAlgorithm

public TarjansSCCAlgorithm(GraphHopperStorage ghStorage,
                           EdgeFilter edgeFilter,
                           boolean ignoreSingleEntries)

Method Detail

getIgnoreSet

public GHBitSet getIgnoreSet()

findComponents

public List<com.carrotsearch.hppc.IntArrayList> findComponents()

Find and return list of all strongly connected components in g.