Package org.apache.poi.hssf.usermodel

Class HSSFOptimiser

  • public class HSSFOptimiser
extends java.lang.Object
    Excel can get cranky if you give it files containing too many (especially duplicate) objects, and this class can help to avoid those. In general, it's much better to make sure you don't duplicate the objects in your code, as this is likely to be much faster than creating lots and lots of excel objects+records, only to optimise them down to many fewer at a later stage. However, sometimes this is too hard / tricky to do, which is where the use of this class comes in.

    • Constructor Summary

      Constructors 
      Constructor Description
      HSSFOptimiser()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static void optimiseCellStyles​(HSSFWorkbook workbook)
      Goes through the Wokrbook, optimising the cell styles by removing duplicate ones, and ones that aren't used.
      static void optimiseFonts​(HSSFWorkbook workbook)
      Goes through the Workbook, optimising the fonts by removing duplicate ones.

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • HSSFOptimiser

        public HSSFOptimiser()

    • Method Detail

      • optimiseFonts

        public static void optimiseFonts​(HSSFWorkbook workbook)
        Goes through the Workbook, optimising the fonts by removing duplicate ones. For now, only works on fonts used in HSSFCellStyle and HSSFRichTextString. Any other font uses (eg charts, pictures) may well end up broken! This can be a slow operation, especially if you have lots of cells, cell styles or rich text strings
        Parameters:
        workbook - The workbook in which to optimise the fonts

      • optimiseCellStyles

        public static void optimiseCellStyles​(HSSFWorkbook workbook)
        Goes through the Wokrbook, optimising the cell styles by removing duplicate ones, and ones that aren't used. For best results, optimise the fonts via a call to optimiseFonts(HSSFWorkbook) first.
        Parameters:
        workbook - The workbook in which to optimise the cell styles