uk.ac.bbk.dcs.automed.qproc.functions.collections
Class Single

java.lang.Object
  uk.ac.bbk.dcs.automed.qproc.functions.BuiltInFunction
      uk.ac.bbk.dcs.automed.qproc.functions.collections.Single

public class Single
extends BuiltInFunction

Field Summary

Fields inherited from class uk.ac.bbk.dcs.automed.qproc.functions.BuiltInFunction

arity, evaluationMeta, logger, typeList

Constructor Summary

Single()

Method Summary

Cell	perform(Cell[] args, Evaluator e)

Methods inherited from class uk.ac.bbk.dcs.automed.qproc.functions.BuiltInFunction

finalize, getArity, getEvaluationMeta, getTypeList, post_processing

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Single

public Single()
       throws ParseException

Throws:

ParseException

Method Detail

perform

public Cell perform(Cell[] args,
                    Evaluator e)

Specified by:

perform in class BuiltInFunction

Returns:

a Cell object that is the root of a graph that represents the result of applying the built-in function to the arguments args. Uses the Evaluator e to evaluate any sub-queries that need to be evaluated.