code: @Override
      protected InheritanceEdge allocateEdge(ClassVertex source, ClassVertex target) {
          return new InheritanceEdge(source, target);
      }
docs: /*
  (non-Javadoc)
  
  @see
  edu.umd.cs.findbugs.graph.AbstractGraph#allocateEdge(edu.umd.cs.findbugs
  .graph.AbstractVertex, edu.umd.cs.findbugs.graph.AbstractVertex)