converts the string to a case-insensitive mapping key . this is lower-cased string representation . concode_field_sep Map<String,String> caseInsensitiveMapping concode_field_sep boolean add concode_elem_sep boolean containsAll concode_elem_sep boolean isEmpty concode_elem_sep void clear concode_elem_sep boolean remove concode_elem_sep boolean contains concode_elem_sep Iterator<String> iterator concode_elem_sep boolean removeAll concode_elem_sep int size concode_elem_sep boolean addAll concode_elem_sep String get concode_elem_sep Object[] toArray concode_elem_sep T[] toArray concode_elem_sep String toString concode_elem_sep boolean retainAll
String function ( String arg0 ) { if ( arg0 == null ) { return null ; } return arg0 . toLowerCase ( ) ; }