code: private boolean probeCodeBaseForResource(DiscoveredCodeBase discoveredCodeBase, String resourceName) {
          ICodeBaseEntry resource = discoveredCodeBase.getCodeBase().lookupResource(resourceName);
          return resource != null;
      }
docs: Probe a codebase to see if a given source exists in that code base.
  
  @param resourceName
  name of a resource
  @return true if the resource exists in the codebase, false if not