org.deri.iris.evaluation.topdown.oldt
Class OLDTEvaluator

java.lang.Object
  org.deri.iris.evaluation.topdown.oldt.OLDTEvaluator

All Implemented Interfaces:

ITopDownEvaluator

public class OLDTEvaluator
extends Object
implements ITopDownEvaluator

Implementation of the OLDT evaluator. For details see 'Deduktive Datenbanken' by Cremers, Griefahn and Hinze (ISBN 978-3528047009).

Author:

gigi

Field Summary

static SimpleRelationFactory

srf

Constructor Summary

OLDTEvaluator(IFacts facts, List<IRule> rules)
Constructor

Method Summary

IRelation	evaluate(IQuery query) Evaluate given query
MemoTable	getMemoTable()
List<IVariable>	getOutputVariables() Return variables of the initial query

Methods inherited from class java.lang.Object

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

Field Detail

srf

public static final SimpleRelationFactory srf

Constructor Detail

OLDTEvaluator

public OLDTEvaluator(IFacts facts,
                     List<IRule> rules)

Constructor

Parameters:

facts - one or many facts

rules - list of rules

Method Detail

getMemoTable

public MemoTable getMemoTable()

evaluate

public IRelation evaluate(IQuery query)
                   throws EvaluationException

Evaluate given query

Specified by:

evaluate in interface ITopDownEvaluator

Parameters:

query - a query

Returns:

relation containing all resolved tuples.

Throws:

EvaluationException - thrown on error

getOutputVariables

public List<IVariable> getOutputVariables()

Return variables of the initial query

Specified by:

getOutputVariables in interface ITopDownEvaluator

Returns:

list of output variables