it.unibz.inf.ontop.iq.node

Interface UnionNode

All Superinterfaces:

Cloneable, ExplicitVariableProjectionNode, NaryOperatorNode, QueryNode

All Known Implementing Classes:

UnionNodeImpl

public interface UnionNode
extends ExplicitVariableProjectionNode, NaryOperatorNode

All its children are expected to project its projected variables See IntermediateQueryFactory for creating a new instance.

Method Summary

Modifier and Type	Method and Description
UnionNode	acceptNodeTransformer(HomogeneousQueryNodeTransformer transformer) "Accept" method for the "Visitor" pattern.
UnionNode	clone() Cloning is needed for having multiple copies in the same intermediate query tree.
boolean	hasAChildWithLiftableDefinition(Variable variable, it.unibz.inf.ontop.com.google.common.collect.ImmutableList<IQTree> children) Returns true if its has, as a child, a construction node defining the variable.
IQTree	makeDistinct(it.unibz.inf.ontop.com.google.common.collect.ImmutableList<IQTree> children) Makes the tree be distinct

Methods inherited from interface it.unibz.inf.ontop.iq.node.ExplicitVariableProjectionNode

getVariables

Methods inherited from interface it.unibz.inf.ontop.iq.node.NaryOperatorNode

acceptTransformer, acceptVisitor, applyDescendingSubstitution, applyDescendingSubstitutionWithoutOptimizing, applyFreshRenaming, computeNotInternallyRequiredVariables, getPossibleVariableDefinitions, getVariableNullability, inferUniqueConstraints, isConstructed, isDistinct, liftIncompatibleDefinitions, normalizeForOptimization, propagateDownConstraint, removeDistincts, validateNode

Methods inherited from interface it.unibz.inf.ontop.iq.node.QueryNode

acceptVisitor, getLocallyDefinedVariables, getLocallyRequiredVariables, getLocalVariables, getRequiredVariables, isEquivalentTo, isSyntacticallyEquivalentTo, isVariableNullable

Method Detail

clone

UnionNode clone()

Description copied from interface: QueryNode

Cloning is needed for having multiple copies in the same intermediate query tree.

Specified by:

clone in interface QueryNode

acceptNodeTransformer

UnionNode acceptNodeTransformer(HomogeneousQueryNodeTransformer transformer)
                         throws QueryNodeTransformationException

Description copied from interface: QueryNode

"Accept" method for the "Visitor" pattern. To be implemented by leaf classes. If the transformation cannot be done, throw a QueryNodeTransformationException

Specified by:

acceptNodeTransformer in interface NaryOperatorNode

Specified by:

acceptNodeTransformer in interface QueryNode

Throws:

QueryNodeTransformationException

hasAChildWithLiftableDefinition

boolean hasAChildWithLiftableDefinition(Variable variable,
                                        it.unibz.inf.ontop.com.google.common.collect.ImmutableList<IQTree> children)

Returns true if its has, as a child, a construction node defining the variable. To be called on already lifted tree.

makeDistinct

IQTree makeDistinct(it.unibz.inf.ontop.com.google.common.collect.ImmutableList<IQTree> children)

Makes the tree be distinct