it.unibz.inf.ontop.iq.node.impl

Class QueryModifierNodeImpl

java.lang.Object

it.unibz.inf.ontop.iq.node.impl.QueryNodeImpl

it.unibz.inf.ontop.iq.node.impl.QueryModifierNodeImpl

All Implemented Interfaces:

QueryModifierNode, QueryNode, UnaryOperatorNode, Cloneable

Direct Known Subclasses:

DistinctNodeImpl, OrderByNodeImpl, SliceNodeImpl

public abstract class QueryModifierNodeImpl
extends QueryNodeImpl
implements QueryModifierNode

Field Summary

Fields

Modifier and Type	Field and Description
protected IntermediateQueryFactory	iqFactory

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	QueryModifierNodeImpl(IntermediateQueryFactory iqFactory)

Method Summary

Modifier and Type	Method and Description
it.unibz.inf.ontop.com.google.common.collect.ImmutableSet<ImmutableSubstitution<NonVariableTerm>>	getPossibleVariableDefinitions(IQTree child)
VariableNullability	getVariableNullability(IQTree child)
boolean	isConstructed(Variable variable, IQTree child)
boolean	isVariableNullable(IntermediateQuery query, Variable variable) Returns true if it cannot guarantee the projected variable to be non-null Throws an IllegalArgumentException if the variable is not projected by the node
IQTree	propagateDownConstraint(ImmutableExpression constraint, IQTree child)

Methods inherited from class it.unibz.inf.ontop.iq.node.impl.QueryNodeImpl

clone

Methods inherited from class java.lang.Object

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

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

acceptNodeTransformer, acceptTransformer, acceptVisitor, applyDescendingSubstitution, applyDescendingSubstitutionWithoutOptimizing, applyFreshRenaming, computeNotInternallyRequiredVariables, inferUniqueConstraints, isDistinct, liftIncompatibleDefinitions, normalizeForOptimization, removeDistincts, validateNode

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

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

Field Detail

iqFactory

protected final IntermediateQueryFactory iqFactory

Constructor Detail

QueryModifierNodeImpl

protected QueryModifierNodeImpl(IntermediateQueryFactory iqFactory)

Method Detail

getVariableNullability

public VariableNullability getVariableNullability(IQTree child)

Specified by:

getVariableNullability in interface UnaryOperatorNode

isConstructed

public boolean isConstructed(Variable variable,
                             IQTree child)

Specified by:

isConstructed in interface UnaryOperatorNode

propagateDownConstraint

public IQTree propagateDownConstraint(ImmutableExpression constraint,
                                      IQTree child)

Specified by:

propagateDownConstraint in interface UnaryOperatorNode

getPossibleVariableDefinitions

public it.unibz.inf.ontop.com.google.common.collect.ImmutableSet<ImmutableSubstitution<NonVariableTerm>> getPossibleVariableDefinitions(IQTree child)

Specified by:

getPossibleVariableDefinitions in interface UnaryOperatorNode

isVariableNullable

public boolean isVariableNullable(IntermediateQuery query,
                                  Variable variable)

Description copied from interface: QueryNode

Returns true if it cannot guarantee the projected variable to be non-null Throws an IllegalArgumentException if the variable is not projected by the node

Specified by:

isVariableNullable in interface QueryNode