ServiceOperation (Starjava TTOOLS API)

```
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

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.Object[]`	`calculateRow(java.lang.Object[] tuple)`	Calculates the output tuple for a given input tuple.
`uk.ac.starlink.table.StarTable`	`getResultMetadata()`	Returns the metadata-only table describing the rows which will be returned by this operation.

- Method Detail
  - getResultMetadata
```
uk.ac.starlink.table.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
```
java.lang.Object[] calculateRow(java.lang.Object[] tuple)
                         throws java.io.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:
    
    java.io.IOException