code: public String getStorageDescription() {
          if (fileItem.isInMemory()) {
              return "in memory";
          } else if (this.fileItem instanceof DiskFileItem) {
              return "at [" + ((DiskFileItem)this.fileItem).getStoreLocation().getAbsolutePath() + "]";
          } else {
              return "on disk";
          }
      }
docs: Return a description for the storage location of the multipart content.
  Tries to be as specific as possible: mentions the file location in case
  of a temporary file.
  
  @return a description for the storage location of the multipart content