Hi Jens,
Thanks for the prompt response.
I was playing with jgrapht for a couple of hours -
In the file org.jgrapht.graph.AbstractBaseGraph.java (which extends
AbstractGraph)
AbstractBaseGraph<V, E> newGraph =
TypeUtil.uncheckedCast(super.clone(), typeDecl);
In the file org.jgrapht.graph.AbstractGraph.java
public abstract class AbstractGraph<V, E>
implements Graph<V, E>
- there is no clone() implementation - so the compiler looks for
Object.clone
Also in the file org.jgrapht.graph.IntrusiveEdge.java
class IntrusiveEdge
implements Cloneable,
Serializable
{
/**
* @see Object#clone()
*/
public Object clone()
{
try {
return super.clone();
} catch (CloneNotSupportedException e) {
// shouldn't happen as we are Cloneable
throw new InternalError();
}
}
}
Again - the compiler looks for Object.clone
So, I implemented a clone() in AbstractGraph.java & IntrusiveEdge.java
And finally I hit :- ClassBasedEdgeFactory.java
private final Class<? extends E> edgeClass;
.
.
public E createEdge(V source, V target)
{
try {
return edgeClass.newInstance();
} catch (Exception ex) {
throw new RuntimeException("Edge factory failed", ex);
}
}
At this point :- I looked for some other graph library. :(
Maybe I am doing something wrong.. any pointers is helpful.
Regards
On Thursday, September 12, 2013 4:06:03 PM UTC-4, Jens wrote:
>
>
> I am looking for an implementation of a Directed Graph for my GWT project
>> - came across jgrapht - but porting it to GWT with all
>> "CloneNotSupportedException" / "Object.clone()" / "newInstance()" issues
>> proved to be troublesome.
>>
>
> Looks like JGraphT does not use newInstance() in the library itself, only
> in a test case. GWT trunk already emulates CloneNotSupportedException so
> implementing clone() methods would also work. But be aware that GWT does
> not provide an implementation of Object.clone() so at some point you must
> create the instance on your own instead of calling super.clone().
>
> But maybe you don't even need to emulate clone() because the only library
> class that calls .clone() is an adapter class for JGraph <-> JGraphT living
> outside of jgrapht-core.
>
> So I think jgrapht-core can made GWT ready without major issues.
>
> Search ".newInstance()":
> https://github.com/jgrapht/jgrapht/search?q=.newInstance%28%29&type=Code
> Search ".clone()":
> https://github.com/jgrapht/jgrapht/search?q=.clone%28%29&type=Code
>
> -- J.
>
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