net.sf.csv4j

Class CSVReader

java.lang.Object

net.sf.csv4j.CSVReader

public class CSVReader
extends Object

Reads and parses CSV lines from an input source. Correctly handles quoted fields which contain line terminators. The CSVReader is designed to be similar to Reader classes and in particular is similar to the LineNumberReader in terms of its API.

Since:

1.0

Author:

Shawn Boyce

Constructor Summary

Constructors

Constructor and Description
CSVReader(Reader reader) Constructs a CSV reader with the default options.
CSVReader(Reader reader, char comment) Constructs a CSV reader with the specified options.
CSVReader(Reader reader, char delimiter, char comment) Constructs a CSV reader with the specified options.

Method Summary

Modifier and Type	Method and Description
void	close() Closes the input
long	countFields() Reads and parses the next CSV line from the input.
String	getCurrentLine()
int	getLineNumber() Returns the current line number.
String	readCSVLine() Read a line of CSV text.
String	readJSonLine() Reads and parses the next CSV line from the input.
List<String>	readLine() Reads and parses the next CSV line from the input.
List<String>	readLine(boolean includeComment) Reads and parses the next CSV line from the input.

Methods inherited from class java.lang.Object

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

Constructor Detail

CSVReader

public CSVReader(Reader reader)

Constructs a CSV reader with the default options.

Parameters:

reader - input to read from.

CSVReader

public CSVReader(Reader reader,
                 char comment)

Constructs a CSV reader with the specified options.

Parameters:

reader - input to read from. A BufferedReader is recommended for better performance. Note that a LineNumberReader should not be used since it will not be able to track the line numbers correctly (newlines can be escaped in a CSV file).

comment - character indicating line is a comment and should be ignored

CSVReader

public CSVReader(Reader reader,
                 char delimiter,
                 char comment)

Constructs a CSV reader with the specified options.

Parameters:

reader - input to read from. A BufferedReader is recommended for better performance. Note that a LineNumberReader should not be used since it will not be able to track the line numbers correctly (newlines can be escaped in a CSV file).

comment - character indicating line is a comment and should be ignored

delimiter - field delimiter character

Method Detail

getLineNumber

public int getLineNumber()

Returns the current line number. Number only changes after readLine() is invoked.

Returns:

current line number

getCurrentLine

public String getCurrentLine()

Returns:

the currentLine

readLine

public List<String> readLine()
                      throws IOException,
                             ParseException

Reads and parses the next CSV line from the input. Comment lines will be ignored.

Returns:

null if EOF reached

Throws:

IOException - if an error occurs reading the input

ParseException - if an error occurs during CSV parsing

readLine

public List<String> readLine(boolean includeComment)
                      throws IOException,
                             ParseException

Reads and parses the next CSV line from the input. Comment lines will be ignored.

Parameters:

includeComment - true to include lines starting with comment char

Returns:

null if EOF reached

Throws:

IOException - if an error occurs reading the input

ParseException - if an error occurs during CSV parsing

countFields

public long countFields()
                 throws IOException,
                        ParseException

Reads and parses the next CSV line from the input. Comment lines will be ignored.

Returns:

the number of fields, -1 if EOF reached

Throws:

IOException - if an error occurs reading the input

ParseException - if an error occurs during CSV parsing

readJSonLine

public String readJSonLine()
                    throws IOException,
                           ParseException

Reads and parses the next CSV line from the input. Comment lines will be ignored.

Returns:

json line

Throws:

IOException - if an error occurs reading the input

ParseException - if an error occurs during CSV parsing

close

public void close()
           throws IOException

Closes the input

Throws:

IOException - if an I/O error occurs

readCSVLine

public String readCSVLine()
                   throws IOException

Read a line of CSV text. A line is terminated by newline ('\n'), carriage return ('\r'), or both ('\r\n') unless they are enclosed within double quotes. Line is also terminated by the EOF.

Returns:

CSV line without line terminator characters; null returned if EOF reached

Throws:

IOException - if an IO error occurs