@Override
             public void addCompletions(@NotNull CompletionParameters parameters,
                                        @NotNull ProcessingContext context,
                                        @NotNull CompletionResultSet resultSet) {
               for (String header : HeaderParserRepository.getInstance().getAllHeaderNames()) {
                 resultSet.addElement(LookupElementBuilder.create(header).withInsertHandler(HEADER_INSERT_HANDLER));
               }
             }
@Override
             public void addCompletions(@NotNull CompletionParameters parameters,
                                        @NotNull ProcessingContext context,
                                        @NotNull CompletionResultSet resultSet)