Package org.apache.trevni

Class ColumnFileWriter

java.lang.Object

org.apache.trevni.ColumnFileWriter

public class ColumnFileWriter
extends Object

Writes data to a column file. All data is buffered until writeTo(File) is called.

Constructor Summary

Constructors

Constructor	Description
ColumnFileWriter(ColumnFileMetaData fileMeta, ColumnMetaData... columnMeta)	Construct given metadata for each column in the file.

Method Summary

Modifier and Type	Method	Description
void	endRow()	Expert: Called after all values are written to a row.
int	getColumnCount()	Return the number of columns in the file.
ColumnFileMetaData	getMetaData()	Return this file's metadata.
long	sizeEstimate()	Return the approximate size of the file that will be written.
void	startRow()	Expert: Called before any values are written to a row.
void	writeLength(int length, int column)	Expert: Declare a count of items to be written to an array column or a column whose parent is an array.
void	writeRow(Object... row)	Add a row to the file.
void	writeTo(File file)	Write all rows added to the named file.
void	writeTo(OutputStream out)	Write all rows added to the named output stream.
void	writeValue(Object value, int column)	Expert: Add a value to a row.

Methods inherited from class java.lang.Object

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

Constructor Details

ColumnFileWriter

public ColumnFileWriter(ColumnFileMetaData fileMeta,
 ColumnMetaData... columnMeta)
                 throws IOException

Construct given metadata for each column in the file.

Throws:

IOException

Method Details

sizeEstimate

public long sizeEstimate()

Return the approximate size of the file that will be written. Tries to slightly over-estimate. Indicates both the size in memory of the buffered data as well as the size of the file that will be written by writeTo(OutputStream).

getMetaData

public ColumnFileMetaData getMetaData()

Return this file's metadata.

getColumnCount

public int getColumnCount()

Return the number of columns in the file.

writeRow

public void writeRow(Object... row)
              throws IOException

Add a row to the file.

Throws:

IOException

startRow

public void startRow()
              throws IOException

Expert: Called before any values are written to a row.

Throws:

IOException

writeLength

public void writeLength(int length,
 int column)
                 throws IOException

Expert: Declare a count of items to be written to an array column or a column whose parent is an array.

Throws:

IOException

writeValue

public void writeValue(Object value,
 int column)
                throws IOException

Expert: Add a value to a row. For values in array columns or whose parents are array columns, this must be preceded by a call to writeLength(int, int) and must be called that many times. For normal columns this is called once for each row in the column.

Throws:

IOException

endRow

public void endRow()
            throws IOException

Expert: Called after all values are written to a row.

Throws:

IOException

writeTo

public void writeTo(File file)
             throws IOException

Write all rows added to the named file.

Throws:

IOException

writeTo

public void writeTo(OutputStream out)
             throws IOException

Write all rows added to the named output stream.

Throws:

IOException