Is it possible to read two files at once in Super CSV?

Question

As in the title is in Super CSV possibility to read two files at once. The code below show the example for one file.csv:

public class Reading {  
    private static final String CSV_FILENAME1 = "src/test/resources/test1/customers.csv";
    public static void partialReadWithCsvMapReader() throws Exception {     
        ICsvMapReader mapReader1 = null;
        try {
            mapReader1 = new CsvMapReader(new FileReader(CSV_FILENAME1), CsvPreference.STANDARD_PREFERENCE);            
            mapReader1.getHeader(true);
            final String[] header = new String[] { "customerNo", "firstName", "lastName", null, null, null, null, null,
                null, null, "TOMEK" };
            final CellProcessor[] processors = new CellProcessor[] { new UniqueHashCode(), new NotNull(),
                new NotNull(), new NotNull(), new NotNull(), new Optional(), new Optional(), new NotNull(),
                new NotNull(), new LMinMax(0L, LMinMax.MAX_LONG), new NotNull()};           
            Map<String, Object> customerMap;
            while( (customerMap = mapReader1.read(header, processors)) != null ) {
                System.out.println(String.format("lineNo=%s, rowNo=%s, customerMap=%s", mapReader1.getLineNumber(),
                    mapReader1.getRowNumber(), customerMap));
            }
        }
        finally {
            if( mapReader1 != null ) {
                mapReader1.close();
            }
        }
    }

}

One solution is to declare the second variable CSV_FILENAME2:

private static final String CSV_FILENAME1 = "src/test/resources/test1/customers.csv";

and so on, but is there any other possibility? Thanks.

What does "at once mean"? Concurrently? Sequentially? What do you have as input, and what do you want as output? — JB Nizet, Apr 13 '14 at 13:23

score 0 · Answer 1 · answered Apr 13 '14 at 23:03

Each CsvReader can only read from a single Reader (which is passed as a constructor argument) - in other words, you can only read one CSV file per CsvReader.

As JB Nizet has commented - you really need to define what you mean by 'at once'. But whether that's concurrently, sequentially, or something else you're still going to need two instances of CsvMapReader.

Is there a requirement that the files be processed together (e.g. combining 2 CSV files into 1) or are you just looking for a way to process multiple files in general?

"Is there a requirement that the files be processed together (e.g. combining 2 CSV files into 1)" -> Yes I am looking something like this. — user3455638, Apr 14 '14 at 11:33

Is it possible to read two files at once in Super CSV?

1 Answers1