code: public java.util.List<CacheParameterGroup> getCacheParameterGroups() {
          if (cacheParameterGroups == null) {
              cacheParameterGroups = new com.amazonaws.internal.SdkInternalList<CacheParameterGroup>();
          }
          return cacheParameterGroups;
      }
docs: <p>
  A list of cache parameter groups. Each element in the list contains detailed information about one cache
  parameter group.
  </p>
  
  @return A list of cache parameter groups. Each element in the list contains detailed information about one cache
  parameter group.