net.sf.csv4j

Class CSVFileReaderProcessor

java.lang.Object

net.sf.csv4j.CSVFileReaderProcessor

public class CSVFileReaderProcessor
extends Object

Provides an easy to use mechanism to process CSV files. The details of reading and parsing the CSV file along with its header are managed.

The API provides a callback processor interface (CSVLineProcessor) which is called as the file is processed to receive the CSV header and data lines. A simpler interface, CSVFieldMapProcessor, provides the field name and values for each line as an easy to access Map.

Example usage with CSVLineProcessor:

      final CSVFileProcessor fp = new CSVFileProcessor();
      fp.processFile( "data.csv", new CSVLineProcessor() {
          public void processHeaderLine( int linenumber, List<String> fields )
          {
              // use / save the header
          }


          public void processDataLine( int linenumber, List<String> fields )
          {
              // use the data
          }
      } );
 

Example usage with CSVFieldMapProcessor:

      final CSVFileProcessor fp = new CSVFileProcessor();
      fp.processFile( "data.csv", new CSVFieldMapProcessor() {
          public void processDataLine( int linenumber, Map<String,String> fields )
          {
              // use the data
          }
      } );
 

Since:

1.0

Author:

Shawn Boyce

Constructor Summary

Constructors

Constructor and Description
CSVFileReaderProcessor() Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
char	getComment() Returns the comment setting.
char	getDelimiter()
boolean	isHasHeader() Indicates if the file has a header line.
int	processFile(String filename, Charset charset, CSVFieldMapProcessor processor) Processes the CSV file using the provided processor.
int	processFile(String filename, Charset charset, CSVLineProcessor processor) Processes the CSV file using the provided processor
int	processFile(String filename, Charset charset, CSVSortedFieldMapProcessor processor) Processes the CSV file using the provided processor.
void	setComment(char comment) Sets the comment string value.
void	setDelimiter(char delimiter)
void	setHasHeader(boolean hasHeader) Sets the hasHeader value.

Methods inherited from class java.lang.Object

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

Constructor Detail

CSVFileReaderProcessor

public CSVFileReaderProcessor()

Constructor.

Method Detail

getComment

public char getComment()

Returns the comment setting.

Returns:

comment setting.

setComment

public void setComment(char comment)

Sets the comment string value.

Parameters:

comment - the new comment string value

getDelimiter

public char getDelimiter()

Returns:

the delimiter

setDelimiter

public void setDelimiter(char delimiter)

Parameters:

delimiter - the delimiter to set

isHasHeader

public boolean isHasHeader()

Indicates if the file has a header line.

Returns:

true if header line expected; false otherwise.

setHasHeader

public void setHasHeader(boolean hasHeader)

Sets the hasHeader value.

Parameters:

hasHeader - true if file has a header line; false if not

processFile

public int processFile(String filename,
              Charset charset,
              CSVLineProcessor processor)
                throws IOException,
                       ProcessingException,
                       ParseException

Processes the CSV file using the provided processor

Parameters:

filename - name of CSV file

processor - handler to process the CSV lines

Returns:

number of lines processed

Throws:

FileNotFoundException - if file not found

IOException - if a read error occurs

ProcessingException - if an exception is thrown by the processor

ParseException - if a error occurs parsing the CSV line

processFile

public int processFile(String filename,
              Charset charset,
              CSVFieldMapProcessor processor)
                throws IOException,
                       ProcessingException,
                       ParseException

Processes the CSV file using the provided processor. Notes:

1. CSV file must have a header line (hasHeader must be true)
2. if a data line has fewer columns than the header line, the missing columns will be blanks

Parameters:

filename - name of CSV file

processor - handler to process the CSV lines

Returns:

number of lines processed

Throws:

FileNotFoundException - if file not found

IOException - if a read error occurs

ProcessingException - if an exception is thrown by the processor

ParseException - if a error occurs parsing the CSV line

processFile

public int processFile(String filename,
              Charset charset,
              CSVSortedFieldMapProcessor processor)
                throws IOException,
                       ProcessingException,
                       ParseException

Processes the CSV file using the provided processor. Notes:

1. CSV file must have a header line (hasHeader must be true)
2. if a data line has fewer columns than the header line, the missing columns will be blanks

Parameters:

filename - name of CSV file

processor - handler to process the CSV lines

Returns:

number of lines processed

Throws:

FileNotFoundException - if file not found

IOException - if a read error occurs

ProcessingException - if an exception is thrown by the processor

ParseException - if a error occurs parsing the CSV line