#43 Support random access reader (read a specific row range)

[cf126330]

I'm evaluating it to use with java batch applications (JSR-352) to implement csv javax.batch.api.chunk.ItemReader and javax.batch.api.chunk.ItemWriter. One of the difficulties is supercsv doesn't support random access read. For example, for a csv file with 1000 rows, I need to read row 500 to row 600 only.

Currently I extend AbstractCsvReader and calling getRow() repeatedly till the desired starting row. It avoids populating beans and running processors, but still doesn't seem very efficient.

I noticed CommentMatcher can be used to skip reading unwanted rows, but it doesn't keep row counting for skipped rows.

[Kasper B. Graversen]

You have to parse the file in order to know when a line ends and a new begins due to a row may span multiple lines.