code: public void setAttribute(String n, Object v)
      {
          attributes.put(n,v);
          if (n.endsWith(".*") && v instanceof Log)
              prefixes.add(n.substring(0,n.length()-2));
      }
docs: /* (non-Javadoc)
  @see org.apache.commons.logging.LogFactory#setAttribute(java.lang.String, java.lang.Object)