net.sf.csv4j

Class CSVStreamProcessor

java.lang.Object

net.sf.csv4j.CSVStreamProcessor

public class CSVStreamProcessor
extends Object

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

The API provides a callback processor interface (CSVLineProcessor) which is called as the stream 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 CSVStreamProcessor fp = new CSVStreamProcessor();
      fp.processStream( "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 CSVStreamProcessor fp = new CSVStreamProcessor();
      fp.processStream( "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
CSVStreamProcessor() Constructor.

Method Summary

Modifier and Type	Method and Description
char	getComment() Returns the comment setting.
boolean	isHasHeader() Indicates if the file has a header line.
int	processStream(InputStreamReader is, CSVFieldMapProcessor processor) Processes the CSV file using the provided processor.
int	processStream(InputStreamReader is, CSVLineProcessor processor) Processes the CSV file using the provided processor.
int	processStream(InputStreamReader is, CSVSortedFieldMapProcessor processor) Processes the CSV file using the provided processor.
void	setComment(char comment) Sets the comment string value.
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

CSVStreamProcessor

public CSVStreamProcessor()

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

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

processStream

public int processStream(InputStreamReader is,
                         CSVLineProcessor processor)
                  throws IOException,
                         ProcessingException,
                         ParseException

Processes the CSV file using the provided processor.

Parameters:

is - stream to read CSV from

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

processStream

public int processStream(InputStreamReader is,
                         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:

is - stream to read CSV from

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

processStream

public int processStream(InputStreamReader is,
                         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:

is - stream to read CSV from

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