Constructor Detail

• SetParameterFilter

  public SetParameterFilter​()

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

• evaluate

  public static java.lang.Object evaluate​(java.lang.String expr,
                                          uk.ac.starlink.table.StarTable table,
                                          java.lang.Class clazz,
                                          java.lang.String type)
                                   throws java.io.IOException

  Evaluates an expression in the context of a table. If a class is specified, the result is guaranteed to be of the type indicated by that class (or an error will be thrown). If no JEL expression can be evaluated, the supplied expression itself will be returned as a string, as long as that is not inconsistent with the requested class.

  Parameters:

  expr - expression to evaluate

  table - evaluation context

  clazz - required class of result, or null; a primitive, rather than wrapper, class should be supplied if available

  type - user-supplied string corresponding to clazz, or null (used for error messages only)

  Throws:

  java.io.IOException