public String getStyleName(String styleId) {
        if (styleId == null) {
            return null;
        }
        return styles.get(styleId);
    }
@param styleId
@return style's name or null if styleId is null or can't be found
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/ooxml/xwpf/XWPFStylesShim.java