code: public void init() {
          
          pocessorMap.clear();
          
          //標準のフィールドプロセッサを登録する。
          registerProcessor(XlsSheetName.class, new SheetNameProcessor());
          registerProcessor(XlsCell.class, new CellProcessor());
          registerProcessor(XlsLabelledCell.class, new LabelledCellProcessor());
          registerProcessor(XlsHorizontalRecords.class, new HorizontalRecordsProcessor());
          registerProcessor(XlsVerticalRecords.class, new VerticalRecordsProcessor());
          registerProcessor(XlsIterateTables.class, new IterateTablesProcessor());
          registerProcessor(XlsArrayCells.class, new ArrayCellsProcessor());
          registerProcessor(XlsLabelledArrayCells.class, new LabelledArrayCellsProcessor());
          
      }
docs: {@link FieldProcessor}の登録状態を初期値に戻します。