private static Set < String > imageOrientationsOf ( ImageMetadata metadata ) { String exifIFD0DirName = new ExifIFD0Directory ( ) . getName ( ) ; Tag [ ] tags = Arrays . stream ( metadata . getDirectories ( ) ) . filter ( dir -> dir . getName ( ) . equals ( exifIFD0DirName ) ) . findFirst ( ) . map ( Directory :: getTags ) . orElseGet ( ( ) -> new Tag [ 0 ] ) ; return Arrays . stream ( tags ) . filter ( tag -> tag . getType ( ) == 274 ) . map ( Tag :: getRawValue ) . collect ( Collectors . toSet ( ) ) ; }
returns the values of the orientation tag