question: public static final List < String > check ( Class < ? extends Transformation > [ ] transformations ) { final List < String > errMsgs = new ArrayList < > ( ) ; for ( int idx = 0 ; idx < transformations . length ; idx ++ ) { final Class < ? extends Transformation > currT = transformations [ idx ] ; final Class < ? extends Transformation > [ ] before = Arrays . copyOf ( transformations , idx ) ; final Class < ? extends Transformation > [ ] after = Arrays . copyOfRange ( transformations , idx + 1 , transformations . length ) ; for ( Annotation ann : currT . getAnnotations ( ) ) { final String errMsg = check ( currT , ann , before , after ) ; if ( errMsg != null ) errMsgs . add ( errMsg ) ; } } return errMsgs ; }
target:  Checks all dependencies of the transformations in the given sequence of transformations.