it.unibz.inf.ontop.iq.optimizer.impl

Class ArgumentTransferInnerJoinFDIQOptimizer.SelfJoinFDSimplifier

java.lang.Object

it.unibz.inf.ontop.iq.optimizer.impl.AbstractSelfJoinSimplifier<FunctionalDependency>

it.unibz.inf.ontop.iq.optimizer.impl.ArgumentTransferInnerJoinFDIQOptimizer.SelfJoinFDSimplifier

Enclosing class:

ArgumentTransferInnerJoinFDIQOptimizer

protected static class ArgumentTransferInnerJoinFDIQOptimizer.SelfJoinFDSimplifier
extends AbstractSelfJoinSimplifier<FunctionalDependency>

Nested Class Summary

Nested classes/interfaces inherited from class it.unibz.inf.ontop.iq.optimizer.impl.AbstractSelfJoinSimplifier

AbstractSelfJoinSimplifier.DeterminantGroupEvaluation, AbstractSelfJoinSimplifier.NormalizationBeforeUnification, AbstractSelfJoinSimplifier.OptimizationState

Field Summary

Fields inherited from class it.unibz.inf.ontop.iq.optimizer.impl.AbstractSelfJoinSimplifier

iqFactory, substitutionFactory, termFactory, unificationTools

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SelfJoinFDSimplifier(CoreSingletons coreSingletons)

Method Summary

Modifier and Type	Method and Description
protected boolean	canEliminateNodes()
protected Optional<AbstractSelfJoinSimplifier.DeterminantGroupEvaluation>	evaluateDeterminantGroup(it.unibz.inf.ontop.com.google.common.collect.ImmutableList<VariableOrGroundTerm> determinants, Collection<ExtensionalDataNode> dataNodes, FunctionalDependency constraint)
protected Stream<FunctionalDependency>	extractConstraints(RelationDefinition relationDefinition)
protected boolean	hasConstraint(ExtensionalDataNode node)
protected ExtensionalDataNode	selectTargetDataNode(Collection<ExtensionalDataNode> dataNodes, FunctionalDependency constraint) Selects as target the node with largest number of external arguments.

Methods inherited from class it.unibz.inf.ontop.iq.optimizer.impl.AbstractSelfJoinSimplifier

normalizeDataNodes, optimizeExtensionalDataNodes, transformInnerJoin, unifyDataNodes

Methods inherited from class java.lang.Object

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

Constructor Detail

SelfJoinFDSimplifier

protected SelfJoinFDSimplifier(CoreSingletons coreSingletons)

Method Detail

canEliminateNodes

protected boolean canEliminateNodes()

Specified by:

canEliminateNodes in class AbstractSelfJoinSimplifier<FunctionalDependency>

hasConstraint

protected boolean hasConstraint(ExtensionalDataNode node)

Specified by:

hasConstraint in class AbstractSelfJoinSimplifier<FunctionalDependency>

extractConstraints

protected Stream<FunctionalDependency> extractConstraints(RelationDefinition relationDefinition)

Specified by:

extractConstraints in class AbstractSelfJoinSimplifier<FunctionalDependency>

evaluateDeterminantGroup

protected Optional<AbstractSelfJoinSimplifier.DeterminantGroupEvaluation> evaluateDeterminantGroup(it.unibz.inf.ontop.com.google.common.collect.ImmutableList<VariableOrGroundTerm> determinants,
                                                                                                   Collection<ExtensionalDataNode> dataNodes,
                                                                                                   FunctionalDependency constraint)

Specified by:

evaluateDeterminantGroup in class AbstractSelfJoinSimplifier<FunctionalDependency>

selectTargetDataNode

protected ExtensionalDataNode selectTargetDataNode(Collection<ExtensionalDataNode> dataNodes,
                                                   FunctionalDependency constraint)

Selects as target the node with largest number of external arguments. Why? Partially arbitrary, but such a target is more likely that it cannot be eliminated by the optimization based on the same terms.