org.apache.poi.hssf.usermodel

Class HSSFOptimiser

java.lang.Object

org.apache.poi.hssf.usermodel.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 and Description
HSSFOptimiser()

Method Summary

Modifier and Type	Method and 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

clone, equals, finalize, 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