class DefaultFontMapper
    {
        private static final FontMapper INSTANCE = new FontMapperImpl();
    }
    
    /**
     * Returns the singleton FontMapper instance.
     * 
     * @return a singleton FontMapper instance
     */
    public static FontMapper instance()
    {<FILL_FUNCTION_BODY>

        if (instance == null)
        {
            instance = DefaultFontMapper.INSTANCE;
        }
        return instance;
    
<no_super_class>