uk.ac.bbk.dcs.automed.qproc.functions.string
Class Substring

java.lang.Object
  uk.ac.bbk.dcs.automed.qproc.functions.BuiltInFunction
      uk.ac.bbk.dcs.automed.qproc.functions.string.Substring

public class Substring
extends BuiltInFunction

Returns a substring of the input string based on the two other integer arguments.

The substring includes the letter denoted by the first integer argument, but does not inlude the letter denoted by the second integer argument. For example 'Substring 'string' 2 4' returns 'tr'.

Author:

Lucas Zamboulis

Field Summary

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

arity, logger, typeList

Constructor Summary

Substring()

Method Summary

Cell	perform(Cell[] args, Evaluator e)

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

finalize, getArity, getTypeList

Methods inherited from class java.lang.Object

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

Constructor Detail

Substring

public Substring()
          throws ParseException

Throws:

ParseException

Method Detail

perform

public Cell perform(Cell[] args,
                    Evaluator e)
             throws TypeException,
                    QProcException

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.

Throws:

TypeException

QProcException