@Override
    public CsvReadWorkbookHolder csvReadWorkbookHolder() {
        return (CsvReadWorkbookHolder)readWorkbookHolder();
    }
A context is the main anchorage point of a ls xls reader.

@author Jiaju Zhuang
fastexcel-core/src/main/java/cn/idev/excel/context/csv/DefaultCsvReadContext.java