question: verifies a variable is not null . concode_field_sep String IDENTIFIER_PATTERN_STR concode_elem_sep Pattern IDENTIFIER_PATTERN concode_field_sep int gt0 concode_elem_sep long gt0 concode_elem_sep int ge0 concode_elem_sep long ge0 concode_elem_sep String validIdentifier concode_elem_sep String notEmpty concode_elem_sep List<String> notEmptyElements concode_elem_sep List<T> notNullElements
target: T function ( T arg0 , String arg1 ) { if ( arg0 == null ) { throw new IllegalArgumentException ( arg1 + "srini_string" ) ; } return arg0 ; }