Package uk.ac.starlink.ttools.filter
Class KeepColumnFilter
java.lang.Object
uk.ac.starlink.ttools.filter.BasicFilter
uk.ac.starlink.ttools.filter.KeepColumnFilter
- All Implemented Interfaces:
ProcessingFilter
Table filter for selecting a number of columns and discarding the rest.
- Since:
- 3 Mar 2005
- Author:
- Mark Taylor (Starlink)
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptioncreateStep
(Iterator<String> argIt) Creates a new ProcessingStep based on a sequence of command-line arguments.protected String[]
static uk.ac.starlink.table.StarTable
keepColumnTable
(uk.ac.starlink.table.StarTable table, String colIdList) Returns a table which selects a number of columns from its base table by column ID.Methods inherited from class uk.ac.starlink.ttools.filter.BasicFilter
explainSyntax, getDescription, getName, getUsage
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Constructor Details
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KeepColumnFilter
public KeepColumnFilter()
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Method Details
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getDescriptionLines
- Specified by:
getDescriptionLines
in classBasicFilter
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createStep
Description copied from interface:ProcessingFilter
Creates a new ProcessingStep based on a sequence of command-line arguments. The argIt argument is an iterator over the command-line arguments positioned just before any arguments intended for this filter. If legal, any that can be comprehended by this filter should be read (iterated over) and removed, and a ProcessingStep should accordingly be returned. In the case of a successful return, it is essential that no arguments other than the ones intended for this filter are read from the iterator.If the argument list is badly-formed as far as this filter is concerned, an
ArgException
should be thrown.- Parameters:
argIt
- iterator over command-line arguments positioned at the first one- Throws:
ArgException
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keepColumnTable
public static uk.ac.starlink.table.StarTable keepColumnTable(uk.ac.starlink.table.StarTable table, String colIdList) throws IOException Returns a table which selects a number of columns from its base table by column ID.- Parameters:
table
- base tablecolIdList
- list of column IDs, one for each column in the output table- Returns:
- new table using columns selected from table
- Throws:
IOException
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