uk.ac.starlink.ttools.task

Class ColumnSelectionMapper

java.lang.Object

uk.ac.starlink.ttools.task.ColumnSelectionMapper

All Implemented Interfaces:

TableMapper

public class ColumnSelectionMapper
extends Object
implements TableMapper

Mapper which operates on a user-supplied selection of the columns of the input table.

Since:

9 May 2006

Author:

Mark Taylor

Constructor Summary

Constructors

Constructor and Description
ColumnSelectionMapper() Constructor.

Method Summary

Modifier and Type	Method and Description
TableMapping	createMapping(uk.ac.starlink.task.Environment env, int nin) Creates a new mapping object, using a given execution environment for any additional required state.
WordsParameter	getColumnsParameter() Returns the parameter which specifies the column IDs for use.
uk.ac.starlink.task.Parameter<?>[]	getParameters() Returns the parameters defined by this mapper.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnSelectionMapper

public ColumnSelectionMapper()

Constructor.

Method Detail

getParameters

public uk.ac.starlink.task.Parameter<?>[] getParameters()

Description copied from interface: TableMapper

Returns the parameters defined by this mapper.

Specified by:

getParameters in interface TableMapper

Returns:

parameter array

createMapping

public TableMapping createMapping(uk.ac.starlink.task.Environment env,
                                  int nin)
                           throws uk.ac.starlink.task.TaskException

Description copied from interface: TableMapper

Creates a new mapping object, using a given execution environment for any additional required state.

Specified by:

createMapping in interface TableMapper

Parameters:

env - execution environment

nin - number of input tables that the mapping will operate on if known; -1 if not

Throws:

uk.ac.starlink.task.TaskException

getColumnsParameter

public WordsParameter getColumnsParameter()

Returns the parameter which specifies the column IDs for use.

Returns:

column list parameter