code: @Override
    public final void setFor(final Field pThing,
      final Class<?> pClass, final String pFieldName) {
      synchronized (this.rapiFieldsMap) {
        Map<String, Field> fldMap = this.rapiFieldsMap.get(pClass);
        if (fldMap == null) {
          fldMap = new HashMap<String, Field>();
          this.rapiFieldsMap.put(pClass, fldMap);
        }
        fldMap.put(pFieldName, pThing);
      }
    }
docs: <p>Set thing for given class and thing name.</p>
  @param pThing Thing
  @param pClass Class
  @param pFieldName Thing Name