org.grouplens.lenskit.util.table.writer

Class CSVWriter

java.lang.Object

org.grouplens.lenskit.util.table.writer.AbstractTableWriter

org.grouplens.lenskit.util.table.writer.CSVWriter

All Implemented Interfaces:

Closeable, AutoCloseable, TableWriter

public class CSVWriter
extends AbstractTableWriter

Implementation of TableWriter for CSV files.

Constructor Summary

Constructors

Constructor and Description
CSVWriter(Writer w, TableLayout l) Construct a new CSV writer.

Method Summary

Modifier and Type	Method and Description
void	close() No-op close implementaiton.
TableLayout	getLayout() Get the layout of this table.
static CSVWriter	open(File file, TableLayout layout) Open a CSV writer to write to an auto-compressed file.
static CSVWriter	open(File file, TableLayout layout, CompressionMode compression) Open a CSV writer to write to a file.
void	writeRow(List<?> row) Write a row to the table.

Methods inherited from class org.grouplens.lenskit.util.table.writer.AbstractTableWriter

checkRowWidth, writeRow

Methods inherited from class java.lang.Object

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

Constructor Detail

CSVWriter

public CSVWriter(@Nonnull
                 Writer w,
                 @Nullable
                 TableLayout l)
          throws IOException

Construct a new CSV writer.

Parameters:

w - The underlying writer to output to.

l - The table layout, or null if the table has no headers.

Throws:

IOException - if there is an error writing the column headers.

Method Detail

close

public void close()
           throws IOException

Description copied from class: AbstractTableWriter

No-op close implementaiton.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface TableWriter

Overrides:

close in class AbstractTableWriter

Throws:

IOException

writeRow

public void writeRow(List<?> row)
              throws IOException

Description copied from interface: TableWriter

Write a row to the table. This method is thread-safe.

Parameters:

row - A row of values. If the table requires more columns, the remaining columns are empty. The row is copied if necessary; the caller is free to re-use the same array for returnValue calls.

Throws:

IOException - if an error occurs writing the row.

getLayout

public TableLayout getLayout()

Description copied from interface: TableWriter

Get the layout of this table.

Returns:

The table's layout.

open

public static CSVWriter open(File file,
                             TableLayout layout,
                             CompressionMode compression)
                      throws IOException

Open a CSV writer to write to a file.

Parameters:

file - The file to write to.

layout - The layout of the table.

compression - What compression, if any, to use.

Returns:

A CSV writer outputting to file.

Throws:

IOException - if there is an error opening the file or writing the column header.

open

public static CSVWriter open(File file,
                             @Nullable
                             TableLayout layout)
                      throws IOException

Open a CSV writer to write to an auto-compressed file. The file will be compressed if its name ends in ".gz".

Parameters:

file - The file.

layout - The table layout.

Returns:

The CSV writer.

Throws:

IOException - if there is an error opening the file or writing the column header.

See Also:

open(File, TableLayout, CompressionMode)