uk.ac.starlink.ttools.calc

Interface ServiceOperation

public interface ServiceOperation

Defines an operation which turns an input tuple into an output tuple. Suitable for use with MultiServiceColumnCalculator.

Since:

14 Oct 2011

Author:

Mark Taylor

Method Summary

Modifier and Type	Method and Description
Object[]	calculateRow(Object[] tuple) Calculates the output tuple for a given input tuple.
StarTable	getResultMetadata() Returns the metadata-only table describing the rows which will be returned by this operation.

Method Detail

getResultMetadata

StarTable getResultMetadata()

Returns the metadata-only table describing the rows which will be returned by this operation. Used for passing to TableSink.acceptMetadata(uk.ac.starlink.table.StarTable). Its data must not be read.

Returns:

data-less table

calculateRow

Object[] calculateRow(Object[] tuple)
               throws IOException

Calculates the output tuple for a given input tuple.

Parameters:

tuple - input tuple

Returns:

output tuple, corresponding to this object's declared metadata

Throws:

IOException