Spring FlatFileReader Jagged CSV file - spring

Question

I'm reading data via spring batch and I'm going to dump it into a database table.
My csv file of musical facts is formatted like this:
question; valid answer; potentially another valid answer; unlikely, but another;
Where all rows have a question and at least one valid answer, but there can be more. The simple way to hold this data is to in the data in a pojo is with one field for a String and another for a List<String>.
Below is a simple line mapper to read a CSV file, but I don't know how to make the necessary changes to accommodate a jagged CSV file in this manner.
#Bean
public LineMapper<MusicalFactoid> musicalFactoidLineMapper() {
DefaultLineMapper<MusicalFactoid> musicalFactoidDefaultLineMapper = new DefaultLineMapper<>();
musicalFactoidDefaultLineMapper.setLineTokenizer(new DelimitedLineTokenizer() {{
setDelimiter(";");
setNames(new String[]{"question", "answer"}); // <- this will not work!
}});
musicalFactoidDefaultLineMapper.setFieldSetMapper(new BeanWrapperFieldSetMapper<MusicalFactoid>() {{
setTargetType(MusicalFactoid.class);
}});
return musicalFactoidDefaultLineMapper;
}
What do I need to do?

Answer 1

Write your own Line Mapper. As far as I see, you don't have any complex logic.
Something like this:
public MyLineMapper implements LineMapper<MusicalFactoid> {
public MusicalFactoid mapLine(String line, int lineNumber) {
MusicalFactoid dto = new MusicalFactoid();
String[] splitted = line.split(";");
dto.setQuestion(splitted[0]);
for (int idx = 1; idx < splitted.length; idx++) {
dto.addAnswer(splitted[idx]);
}
return dto;
}
}