code: @Override
  	public void close() throws IOException {
  		if (this.in!=null) {
  			in.close();
  		}
  		if (this.currentWorkbook!=null) {
  			LOG.debug("Closing current Workbook \""+this.hocr.getFileName()+"\"");
  			this.currentWorkbook.close();
  		}
  		for (Workbook addedWorkbook: this.addedWorkbooks) {
  			
  			addedWorkbook.close();
  		}
  	
  	}
docs: Close parser and linked workbooks