uk.ac.starlink.feather

Interface ItemAccumulator

All Known Implementing Classes:

AbstractItemAccumulator

public interface ItemAccumulator

Collects all the values of a column and then writes them out as a feather-format column.

Since:

27 Feb 2020

Author:

Mark Taylor

Method Summary

Modifier and Type	Method and Description
void	addItem(Object item) Receive the next value in the column.
void	close() Tidies up resources, in particular discarding any off-heap temporary storage that may have been allocated.
uk.ac.bristol.star.feather.ColStat	writeColumnBytes(OutputStream out) Writes a feather-format column to the given output stream representing all the objects submitted by prior valls to the addItem method.

Method Detail

addItem

void addItem(Object item)
      throws IOException

Receive the next value in the column.

Parameters:

item - column cell value

Throws:

IOException

writeColumnBytes

uk.ac.bristol.star.feather.ColStat writeColumnBytes(OutputStream out)
                                             throws IOException

Writes a feather-format column to the given output stream representing all the objects submitted by prior valls to the addItem method. The number of bytes written must be a multiple of 8.

Parameters:

out - destination stream

Returns:

details about what was written

Throws:

IOException

close

void close()
    throws IOException

Tidies up resources, in particular discarding any off-heap temporary storage that may have been allocated. Calling any of the other methods of this interface after closing it has undefined effects. Multiple calls to close are permitted.

Throws:

IOException