edu.uci.ics.jung.utils
Class DefaultParallelEdgeIndexFunction

java.lang.Object
  edu.uci.ics.jung.utils.DefaultParallelEdgeIndexFunction

All Implemented Interfaces:

ParallelEdgeIndexFunction

public class DefaultParallelEdgeIndexFunction
extends Object
implements ParallelEdgeIndexFunction

A class which creates and maintains indices for parallel edges. Parallel edges are defined here to be those edges of type Edge that are returned by v.findEdgeSet(w) for some v and w.

At this time, users are responsible for resetting the indices if changes to the graph make it appropriate.

Author:

Joshua O'Madadhain, Tom Nelson

Field Summary

protected Map

edge_index

Method Summary

protected Integer	getIndex_internal(Edge e)
int	getIndex(Edge e) Returns the index for the specified edge.
static DefaultParallelEdgeIndexFunction	getInstance()
void	reset() Clears all edge indices for all edges in all graphs.
void	reset(Edge e) Resets the indices for this edge and its parallel edges.

Methods inherited from class java.lang.Object

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

Field Detail

edge_index

protected Map edge_index

Method Detail

getInstance

public static DefaultParallelEdgeIndexFunction getInstance()

getIndex

public int getIndex(Edge e)

Returns the index for the specified edge. Calculates the indices for e and for all edges parallel to e.

Specified by:

getIndex in interface ParallelEdgeIndexFunction

getIndex_internal

protected Integer getIndex_internal(Edge e)

reset

public void reset(Edge e)

Resets the indices for this edge and its parallel edges. Should be invoked when an edge parallel to e has been added or removed.

Parameters:

e -

reset

public void reset()

Clears all edge indices for all edges in all graphs. Does not recalculate the indices.