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

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

All Implemented Interfaces:

IEvaluationStrategy

public class OLDTEvaluationStrategy
extends Object
implements IEvaluationStrategy

Field Summary

protected Configuration	mConfiguration
protected IFacts	mFacts
protected List<IRule>	mRules

Constructor Summary

OLDTEvaluationStrategy(IFacts facts, List<IRule> rules, Configuration configuration)
Constructor

Method Summary

IRelation

evaluateQuery(IQuery query, List<IVariable> outputVariables) Evaluate the query

Methods inherited from class java.lang.Object

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

Field Detail

mFacts

protected final IFacts mFacts

mRules

protected final List<IRule> mRules

mConfiguration

protected final Configuration mConfiguration

Constructor Detail

OLDTEvaluationStrategy

public OLDTEvaluationStrategy(IFacts facts,
                              List<IRule> rules,
                              Configuration configuration)
                       throws EvaluationException

Constructor

Parameters:

facts - Given facts.

rules - Given rules.

configuration - Configuration

Throws:

EvaluationException

Method Detail

evaluateQuery

public IRelation evaluateQuery(IQuery query,
                               List<IVariable> outputVariables)
                        throws ProgramNotStratifiedException,
                               RuleUnsafeException,
                               EvaluationException

Evaluate the query

Specified by:

evaluateQuery in interface IEvaluationStrategy

Parameters:

query - The query to evaluate.

outputVariables - If this is not null, it will be filled with the variable bindings of the result relation, i.e. there will be one variable instance for each term (in one row) of the results set

Returns:

The relation of results.

Throws:

ProgramNotStratifiedException - If the program (knowledge-base)can not be stratified

RuleUnsafeException - If the program (knowledge-base) contains an unsafe rule.

EvaluationException - If the evaluation fails for any other reason.