org.deri.iris.rules.optimisation
Class JoinConditionOptimiser

java.lang.Object
  org.deri.iris.rules.optimisation.JoinConditionOptimiser

All Implemented Interfaces:

IRuleOptimiser

public class JoinConditionOptimiser
extends Object
implements IRuleOptimiser

This optimiser attempts to use the same variable for join conditions. e.g. t(?X,?Y,?Z) :- p(?X), q(?Y), r(?Z), ?X = ?Y, ?Y = ?Z. ==>> t(?X,?X,?X) :- p(?X), q(?X), r(?X).

Constructor Summary

JoinConditionOptimiser()

Method Summary

IRule

optimise(IRule rule) Optimise the rule.

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinConditionOptimiser

public JoinConditionOptimiser()

Method Detail

optimise

public IRule optimise(IRule rule)

Description copied from interface: IRuleOptimiser

Optimise the rule.

Specified by:

optimise in interface IRuleOptimiser

Parameters:

rule - The rule to optimise.

Returns:

The optimised rule.