jgrapht-users

[jgrapht-users] Doubt - Graph class / Weighted Graphs

[Anderson A. <and...@ya...>]

Due to some changes with Graph class provided with
JGraphT 0.7 lib, I am experiencing a problem.

/* An example code using JGraphT 0.6 lib */

Graph graph = new WeightedPseudograph();

INode node1 = new Node2D();
graph.addVertex(node1);
INode node2 = new Node2D();
graph.addVertex(node2);

MyEdge edge = new MyEdge(node1, node2, f);
edge.setWeight(feature.getGeometry().getLength());
graph.addEdge(edge);

/* In 0.7 lib these relations were modified,
 * Graph class has no more this addEdge method.
 * Using JGraphT 0.7 lib, I'm trying:
 */

WeightedGraph graph = new WeightedPseudograph(
Edge.class );

INode node1 = new Node2D();
graph.addVertex(node1);
INode node2 = new Node2D();
graph.addVertex(node2);

graph.setEdgeWeight(graph.addEdge(node1, node2),
feature.getGeometry().getLength());

/* But I got a RuntimeException: Edge Factory failed
*/

java.lang.RuntimeException: Edge factory failed
	at
org.jgrapht.graph.ClassBasedEdgeFactory.createEdge(Unknown
Source)
	at
org.jgrapht.graph.AbstractBaseGraph.addEdge(Unknown
Source)
	at
com.shortestpath.topology.GraphFactory.createGraph(GraphFactory.java:124)
	at
com.shortestpath.jgraphtLib.PlugIn.run(PlugIn.java:101)
	at 

com.vividsolutions.jump.workbench.ui.task.TaskMonitorManager$TaskWrapper.run(TaskMonitorManager.java:118)
	at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.InstantiationException:
com.shortestpath.topology.Edge
	at java.lang.Class.newInstance0(Class.java:335)
	at java.lang.Class.newInstance(Class.java:303)
	... 6 more

   I´ll be thankfull for any help.

   Anderson.



 
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Re: [jgrapht-users] Doubt - Graph class / Weighted Graphs

[John V. S. <js...@gm...>]

These wiki pages may be helpful:

http://jgrapht.wikispaces.com/message/view/home/88807

http://jgrapht.wikispaces.com/MigrationTo0.7

I'll send you a wikispaces invite so that if you want to share what you 
learn, you can update the migration page.

JVS

Anderson Adolfs wrote:
> Due to some changes with Graph class provided with
> JGraphT 0.7 lib, I am experiencing a problem.
> 
> /* An example code using JGraphT 0.6 lib */
> 
> Graph graph = new WeightedPseudograph();
> 
> INode node1 = new Node2D();
> graph.addVertex(node1);
> INode node2 = new Node2D();
> graph.addVertex(node2);
> 
> MyEdge edge = new MyEdge(node1, node2, f);
> edge.setWeight(feature.getGeometry().getLength());
> graph.addEdge(edge);
> 
> /* In 0.7 lib these relations were modified,
>  * Graph class has no more this addEdge method.
>  * Using JGraphT 0.7 lib, I'm trying:
>  */
> 
> WeightedGraph graph = new WeightedPseudograph(
> Edge.class );
> 
> INode node1 = new Node2D();
> graph.addVertex(node1);
> INode node2 = new Node2D();
> graph.addVertex(node2);
> 
> graph.setEdgeWeight(graph.addEdge(node1, node2),
> feature.getGeometry().getLength());
> 
> /* But I got a RuntimeException: Edge Factory failed
> */
> 
> java.lang.RuntimeException: Edge factory failed
> 	at
> org.jgrapht.graph.ClassBasedEdgeFactory.createEdge(Unknown
> Source)
> 	at
> org.jgrapht.graph.AbstractBaseGraph.addEdge(Unknown
> Source)
> 	at
> com.shortestpath.topology.GraphFactory.createGraph(GraphFactory.java:124)
> 	at
> com.shortestpath.jgraphtLib.PlugIn.run(PlugIn.java:101)
> 	at 
> 
> com.vividsolutions.jump.workbench.ui.task.TaskMonitorManager$TaskWrapper.run(TaskMonitorManager.java:118)
> 	at java.lang.Thread.run(Thread.java:595)
> Caused by: java.lang.InstantiationException:
> com.shortestpath.topology.Edge
> 	at java.lang.Class.newInstance0(Class.java:335)
> 	at java.lang.Class.newInstance(Class.java:303)
> 	... 6 more
> 
>    I´ll be thankfull for any help.
> 
>    Anderson.