com.opencsv

Class CSVReaderHeaderAware

java.lang.Object

com.opencsv.CSVReader

com.opencsv.CSVReaderHeaderAware

All Implemented Interfaces:

Closeable, AutoCloseable, Iterable<String[]>

public class CSVReaderHeaderAware
extends CSVReader

Handy reader when there's insufficient motivation to use the bean binding but the header mapping is still desired.

Since:

4.2

Author:

Andre Rosot

Field Summary

Fields inherited from class com.opencsv.CSVReader

br, DEFAULT_KEEP_CR, DEFAULT_MULTILINE_LIMIT, DEFAULT_SKIP_LINES, DEFAULT_VERIFY_READER, errorLocale, hasNext, keepCR, lineReader, linesRead, linesSkipped, multilineLimit, parser, PASSTHROUGH_EXCEPTIONS, peekedLine, peekedLines, READ_AHEAD_LIMIT, recordsRead, skipLines, verifyReader

Constructor Summary

Constructors

Constructor and Description
CSVReaderHeaderAware(Reader reader) Constructor with supplied reader.

Method Summary

Modifier and Type	Method and Description
Map<String,String>	readMap() Reads the next line and returns a map of header values and data values.
String[]	readNext(String... headerNames) Retrieves a specific data element from a line based on the value of the header.

Methods inherited from class com.opencsv.CSVReader

close, combineResultsFromMultipleReads, getLinesRead, getMultilineLimit, getNextLine, getParser, getRecordsRead, getSkipLines, isClosed, iterator, keepCarriageReturns, peek, readAll, readNext, readNextSilently, setErrorLocale, skip, validateResult, verifyReader

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

CSVReaderHeaderAware

public CSVReaderHeaderAware(Reader reader)
                     throws IOException

Constructor with supplied reader.

Parameters:

reader - The reader to an underlying CSV source

Throws:

IOException - If there is an error when reading the header

Method Detail

readNext

public String[] readNext(String... headerNames)
                  throws IOException,
                         CsvValidationException

Retrieves a specific data element from a line based on the value of the header.

Parameters:

headerNames - Name of the header element whose data we are trying to find

Returns:

The data element whose position matches that of the header whose value is passed in. Will return null when there are no more data elements.

Throws:

IOException - An error occured during the read or there is a mismatch in the number of data items in a row and the number of header items

IllegalArgumentException - If headerName does not exist

CsvValidationException - If a custom defined validator fails.

readMap

public Map<String,String> readMap()
                           throws IOException,
                                  CsvValidationException

Reads the next line and returns a map of header values and data values.

Returns:

A map whose key is the header row of the data file and the values is the data values. Or null if the line is blank.

Throws:

IOException - An error occurred during the read or there is a mismatch in the number of data items in a row and the number of header items.

CsvValidationException - If a custom defined validator fails.