uk.ac.starlink.ttools.calc
Class MultiServiceColumnCalculator<S>

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 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

MultiServiceColumnCalculator()

Method Summary

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 class java.lang.Object

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

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

getTupleInfos

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 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:

IOException