[jgap-users] jGap won't use my chromosome

[Gabriel R. <gab...@he...>]

Hello,

I was using the regular Chromosome class with BooleanGenes, until I
needed to use them (the chromosomes) as keys in a hashmap. I noticed
that I had collisions, and after verifying that the jGap source code
didn't have a bug (and it doesn't) I decided to create a
UniqueChromosome class that inherits from Chromosome and overrides
hashcode() and equals. There is an internal static counter that gives a
unique id to each UniqueChromosome, thus the only way for them to be
euqal is for them to have the same genes and the same id, which is
impossible since there is no way to set/change the id after the object
is created.

My problem is that I give the UniqueChromosome as the as the sample
Chromosome to the configuration and as soon as I generate a random
chromosome using this code :

private IChromosome generateNewChromosome(Configuration conf) {

      IChromosome c = conf.getSampleChromosome();

      IInitializer chromIniter =
conf.getJGAPFactory().getInitializerFor(c, c.getClass());
      try {
         return (IChromosome) chromIniter.perform(c, c.getClass(), null);
      } catch (Exception e) {
         e.printStackTrace();
      }

      return null;
   }

I get a Chromosome back and not a UniqueChromosome. I checked in debug
mode, and c is a UniqueChromosome, and c.class() returns the correct
class, but as soon as the initializer's perform() method returns, I get
a Chromosome back.

Since I get a Chromosome back, my hashcode() and equals() methods aren't
used (of course) and I get collisions.

The DefaultInitializer's perform() method is what is being called by the
way.

Does anyone know why this isn't working correctly? Or did I do something
wrong?

Best regards,
Gabriel