private void applyHssfFacetOptions(CellStyle style) {
        Font facetFont = wb.getFontAt(style.getFontIndex());
        String facetFontStyle = options.getFacetFontStyle();
        if (facetFontStyle != null) {
            if ("BOLD".equalsIgnoreCase(facetFontStyle)) {
                facetFont.setBold(true);
            }
            if ("ITALIC".equalsIgnoreCase(facetFontStyle)) {
                facetFont.setItalic(true);
            }
        }

        HSSFPalette palette = ((HSSFWorkbook) wb).getCustomPalette();
        Color color;

        String facetBackground = options.getFacetBgColor();
        if (facetBackground != null) {
            color = Color.decode(facetBackground);
            HSSFColor backgroundColor = palette.findSimilarColor(color.getRed(), color.getGreen(), color.getBlue());
            style.setFillForegroundColor(backgroundColor.getIndex());
            style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        }

        String facetFontColor = options.getFacetFontColor();
        if (facetFontColor != null) {
            color = Color.decode(facetFontColor);
            HSSFColor facetColor = palette.findSimilarColor(color.getRed(), color.getGreen(), color.getBlue());
            facetFont.setColor(facetColor.getIndex());
        }

        String facetFontSize = options.getFacetFontSize();
        if (facetFontSize != null) {
            facetFont.setFontHeightInPoints(Short.parseShort(facetFontSize));
        }
    }
If value is an explicitly set value, then use that value to update the cell, otherwise if
ExcelOptions.isStronglyTypedCells = true then for cells check:
<pre>
Numeric - String that are all numbers make them a numeric cell
Currency - Convert to currency cell so math can be done in Excel
String - fallback to just a normal string cell
</pre>
Possible future enhancement of Date cells as well.

@param column the column from which value comes
@param cell the cell to operate on
@param value the ColumnValue value to put in the cell
primefaces/src/main/java/org/primefaces/util/ExcelStylesManager.java