Package hudson.util

Class CyclicGraphDetector<N>

java.lang.Object

hudson.util.CyclicGraphDetector<N>

public abstract class CyclicGraphDetector<N>
extends Object

Traverses a directed graph and if it contains any cycle, throw an exception.

Author:

Kohsuke Kawaguchi

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	CyclicGraphDetector.CycleDetectedException

Constructor Summary

Constructors

Constructor	Description
CyclicGraphDetector()

Method Summary

Modifier and Type	Method	Description
protected abstract Iterable<? extends N>	getEdges(N n)	List up edges from the given node (by listing nodes that those edges point to.)
List<N>	getSorted()	Returns all the nodes in the topologically sorted order.
protected void	reactOnCycle(N q, List<N> cycle)	React on detected cycles - default implementation throws an exception.
void	run(Iterable<? extends N> allNodes)

Methods inherited from class java.lang.Object

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

Constructor Detail

CyclicGraphDetector

public CyclicGraphDetector()

Method Detail

run

public void run(Iterable<? extends N> allNodes)
         throws CyclicGraphDetector.CycleDetectedException

Throws:

CyclicGraphDetector.CycleDetectedException

getSorted

public List<N> getSorted()

Returns all the nodes in the topologically sorted order. That is, if there's an edge a → b, b always come earlier than a.

getEdges

protected abstract Iterable<? extends N> getEdges(N n)

List up edges from the given node (by listing nodes that those edges point to.)

Returns:

Never null.

reactOnCycle

protected void reactOnCycle(N q,
                            List<N> cycle)
                     throws CyclicGraphDetector.CycleDetectedException

React on detected cycles - default implementation throws an exception.

Throws:

CyclicGraphDetector.CycleDetectedException