uk.ac.starlink.ttools.filter
Class SetParameterFilter
java.lang.Object
uk.ac.starlink.ttools.filter.BasicFilter
uk.ac.starlink.ttools.filter.SetParameterFilter
- All Implemented Interfaces:
- ProcessingFilter
public class SetParameterFilter
- extends BasicFilter
Filter which sets a parameter on the table.
- Since:
- 2 Aug 2006
- Author:
- Mark Taylor
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
SetParameterFilter
public SetParameterFilter()
getDescriptionLines
protected String[] getDescriptionLines()
- Specified by:
getDescriptionLines
in class BasicFilter
createStep
public ProcessingStep createStep(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 Object evaluate(String expr,
StarTable table,
Class clazz,
String type)
throws 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 evaluatetable
- evaluation contextclazz
- required class of result, or null;
a primitive, rather than wrapper, class
should be supplied if availabletype
- user-supplied string corresponding to clazz, or null
(used for error messages only)
- Throws:
IOException
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