uk.ac.bbk.dcs.automed.qproc.functions.xml
Class ElementsFromRDB

java.lang.Object
  uk.ac.bbk.dcs.automed.qproc.functions.xml.ElementsFromRDB

All Implemented Interfaces:

BuiltInFunction

public class ElementsFromRDB
extends java.lang.Object
implements BuiltInFunction

Input 1: the unique ID of the element whose extent this function is creating
Input 2: the scheme of the relational table

Output: the extent of the element corresponding to the relational table

Author:

Lucas Zamboulis

Constructor Summary

ElementsFromRDB()

Method Summary

int	getArity() Returns the arity of the function.
Cell	perform(Cell[] args, Evaluator e) 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.

Methods inherited from class java.lang.Object

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

Constructor Detail

ElementsFromRDB

public ElementsFromRDB()

Method Detail

getArity

public int getArity()

Description copied from interface: BuiltInFunction

Returns the arity of the function.

Specified by:

getArity in interface BuiltInFunction

perform

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

Description copied from interface: 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.

Specified by:

perform in interface BuiltInFunction