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https://issues.apache.org/jira/browse/SANDBOX-374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marco Speranza updated SANDBOX-374:
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Attachment: SANDBOX-374-Kruskal-NotConnectGraph_problem.patch
Hi here is a patch that resolve the problem and the relative test case.
ciao
> Kruskal's algorithm doesn't accept sparse graph
> -----------------------------------------------
>
> Key: SANDBOX-374
> URL: https://issues.apache.org/jira/browse/SANDBOX-374
> Project: Commons Sandbox
> Issue Type: Bug
> Components: Graph
> Reporter: Marco Speranza
> Attachments: SANDBOX-374-Kruskal-NotConnectGraph_problem.patch
>
>
> Hi guys,
> I found a little problem into Kruskal's algorithm when the input graph is not
> connected and/or it's a graph without the edges.
> I created a test case that produces the follow error:
> {code}
> Running org.apache.commons.graph.spanning.KruskalTestCase
> Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.096 sec <<<
> FAILURE!
> verifyNotConnectedMinimumSpanningTree(org.apache.commons.graph.spanning.KruskalTestCase)
> Time elapsed: 0.007 sec <<< ERROR!
> java.util.NoSuchElementException
> at java.util.AbstractQueue.remove(AbstractQueue.java:90)
> at
> org.apache.commons.graph.spanning.DefaultSpanningTreeAlgorithmSelector.applyingKruskalAlgorithm(DefaultSpanningTreeAlgorithmSelector.java:87)
> {code}
> ciao
> Marco
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