static String [ ] decode ( String filename ) { int i = filename . indexOf ( "+" ) ; if ( i == - 1 ) return new String [ ] { decodePart ( filename ) , null , null } ; int j = filename . lastIndexOf ( "+" ) ; return new String [ ] { decodePart ( filename . substring ( 0 , i ) ) , decodePart ( filename . substring ( i + 1 , j ) ) , decodePart ( filename . substring ( j + 1 ) ) } ; }
reverses the encoding