Class KeepColumnFilter

java.lang.Object
uk.ac.starlink.ttools.filter.BasicFilter
uk.ac.starlink.ttools.filter.KeepColumnFilter
All Implemented Interfaces:
ProcessingFilter

public class KeepColumnFilter extends BasicFilter
Table filter for selecting a number of columns and discarding the rest.
Since:
3 Mar 2005
Author:
Mark Taylor (Starlink)
  • Constructor Details

    • KeepColumnFilter

      public KeepColumnFilter()
  • Method Details

    • getDescriptionLines

      protected String[] getDescriptionLines()
      Specified by:
      getDescriptionLines in class BasicFilter
    • createStep

      public ProcessingStep createStep(Iterator<String> argIt) throws ArgException
      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
    • 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 table
      colIdList - list of column IDs, one for each column in the output table
      Returns:
      new table using columns selected from table
      Throws:
      IOException