geopackage-sdk/src/main/java/mil/nga/geopackage/extension/style/FeatureStyleExtension.java
private long getOrInsertStyle(StyleRow style) {
        long styleId;
        if (style.hasId()) {
            styleId = style.getId();
        } else {
            StyleDao styleDao = getStyleDao();
            styleId = styleDao.create(style);
        }
        return styleId;
    }
private long getOrInsertStyle(StyleRow style) {
        long styleId;
        if (style.hasId()) {
            styleId = style.getId();
        } else {
            StyleDao styleDao = getStyleDao();
            styleId = styleDao.create(style);
        }
        return styleId;
    }
Get the style id, either from the existing style or by inserting a new
one

@param style style row
@return style id