MultiServiceColumnCalculator (Starjava TTOOLS API)

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java.lang.Object
- uk.ac.starlink.ttools.calc.MultiServiceColumnCalculator<S>

All Implemented Interfaces:

ColumnCalculator<S>

Direct Known Subclasses:

SchlegelCalculator
```
public abstract class MultiServiceColumnCalculator<S>
extends java.lang.Object
implements ColumnCalculator<S>
```
ColumnCalculator implementation which works by invoking a service for each row. In this case the calculation can be done row by row, but if the service is slow use of the ColumnCalculator interface can allow multiplexing for performance.

Since:

14 Oct 2011

Author:

Mark Taylor

Constructor Summary

Constructors
Constructor Description

MultiServiceColumnCalculator()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`calculateColumns(S spec, uk.ac.starlink.table.StarTable tupleTable, uk.ac.starlink.table.TableSink sink)`	Performs the calculation.
`abstract ServiceOperation`	`createServiceOperation(S spec)`	Defines the service operation to be invoked for each row.

Methods inherited from interface uk.ac.starlink.ttools.calc.ColumnCalculator
getTupleInfos

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - MultiServiceColumnCalculator
```
public MultiServiceColumnCalculator()
```
- Method Detail
  - createServiceOperation
```
public abstract ServiceOperation createServiceOperation(S spec)
```
    Defines the service operation to be invoked for each row.
    
    Parameters:
    
    spec - specification object for the calculation
  - calculateColumns
```
public void calculateColumns(S spec,
                             uk.ac.starlink.table.StarTable tupleTable,
                             uk.ac.starlink.table.TableSink sink)
                      throws java.io.IOException
```
    Description copied from interface: ColumnCalculator
    
    Performs the calculation. Rows are written to the output sink based on the input table and configuration contained in the spec object. The output table must have the same number of rows as the input table, and will not normally contain any of the same columns.
    
    Specified by:
    
    calculateColumns in interface ColumnCalculator<S>
    
    Parameters:
    
    spec - specification object providing additional instructions about the calculation to be performed
    
    tupleTable - input table, with one column for each tuple element
    
    sink - sink to which the output table is written
    
    Throws:
    
    java.io.IOException

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