Package uk.ac.starlink.ttools.task
Class ColumnSelectionMapper
java.lang.Object
uk.ac.starlink.ttools.task.ColumnSelectionMapper
- All Implemented Interfaces:
TableMapper
Mapper which operates on a user-supplied selection of the columns of
the input table.
- Since:
- 9 May 2006
- Author:
- Mark Taylor
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptioncreateMapping
(uk.ac.starlink.task.Environment env, int nin) Creates a new mapping object, using a given execution environment for any additional required state.Returns the parameter which specifies the column IDs for use.uk.ac.starlink.task.Parameter<?>[]
Returns the parameters defined by this mapper.
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Constructor Details
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ColumnSelectionMapper
public ColumnSelectionMapper()Constructor.
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Method Details
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getParameters
public uk.ac.starlink.task.Parameter<?>[] getParameters()Description copied from interface:TableMapper
Returns the parameters defined by this mapper.- Specified by:
getParameters
in interfaceTableMapper
- Returns:
- parameter array
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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 interfaceTableMapper
- Parameters:
env
- execution environmentnin
- number of input tables that the mapping will operate on if known; -1 if not- Throws:
uk.ac.starlink.task.TaskException
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getColumnsParameter
Returns the parameter which specifies the column IDs for use.- Returns:
- column list parameter
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