Constructor Detail

• KeepColumnFilter

  public KeepColumnFilter​()

Method Detail

• getDescriptionLines

  protected java.lang.String[] getDescriptionLines​()

  Specified by:

  getDescriptionLines in class BasicFilter

• createStep

  public ProcessingStep createStep​(java.util.Iterator 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. If its usageFrament is blank, it will be filled in later using this mode's usage text.

  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,
                                                               java.lang.String colIdList)
                                                        throws java.io.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:

  java.io.IOException