it.unibz.inf.ontop.iq.transformer.impl

Class BooleanExpressionPusher

java.lang.Object

it.unibz.inf.ontop.iq.transformer.impl.BooleanExpressionPusher

All Implemented Interfaces:

IQVisitor<Optional<IQTree>>

public class BooleanExpressionPusher
extends Object
implements IQVisitor<Optional<IQTree>>

Tries to push down the expression given. If it succeeds, return a IQTree, otherwise nothing. ONLY CARES about the expression given as input.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BooleanExpressionPusher(ImmutableExpression expressionToPushDown, CoreSingletons coreSingletons)

Method Summary

Modifier and Type	Method and Description
Optional<IQTree>	visitAggregation(AggregationNode aggregationNode, IQTree child)
Optional<IQTree>	visitConstruction(ConstructionNode rootNode, IQTree child)
Optional<IQTree>	visitDistinct(DistinctNode rootNode, IQTree child)
Optional<IQTree>	visitEmpty(EmptyNode node)
Optional<IQTree>	visitExtensionalData(ExtensionalDataNode dataNode)
Optional<IQTree>	visitFilter(FilterNode rootNode, IQTree child) NB: focuses on the expressionToPushDown, NOT on pushing down its own expression
Optional<IQTree>	visitInnerJoin(InnerJoinNode rootNode, it.unibz.inf.ontop.com.google.common.collect.ImmutableList<IQTree> children)
Optional<IQTree>	visitIntensionalData(IntensionalDataNode dataNode)
Optional<IQTree>	visitLeftJoin(LeftJoinNode rootNode, IQTree leftChild, IQTree rightChild) Only pushes on the left TODO: consider pushing on the right safe expressions
Optional<IQTree>	visitNative(NativeNode nativeNode)
Optional<IQTree>	visitNonStandardBinaryNonCommutativeNode(BinaryNonCommutativeOperatorNode rootNode, IQTree leftChild, IQTree rightChild) Blocks by default
Optional<IQTree>	visitNonStandardLeafNode(LeafIQTree leafNode)
Optional<IQTree>	visitNonStandardNaryNode(NaryOperatorNode rootNode, it.unibz.inf.ontop.com.google.common.collect.ImmutableList<IQTree> children) Blocks by default
Optional<IQTree>	visitNonStandardUnaryNode(UnaryOperatorNode rootNode, IQTree child) Blocks by default
Optional<IQTree>	visitOrderBy(OrderByNode rootNode, IQTree child)
protected Optional<IQTree>	visitPassingUnaryNode(UnaryOperatorNode rootNode, IQTree child)
Optional<IQTree>	visitSlice(SliceNode sliceNode, IQTree child) The slice blocks
Optional<IQTree>	visitTrue(TrueNode node)
Optional<IQTree>	visitUnion(UnionNode rootNode, it.unibz.inf.ontop.com.google.common.collect.ImmutableList<IQTree> children)

Methods inherited from class java.lang.Object

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

Constructor Detail

BooleanExpressionPusher

protected BooleanExpressionPusher(ImmutableExpression expressionToPushDown,
                                  CoreSingletons coreSingletons)

Method Detail

visitConstruction

public Optional<IQTree> visitConstruction(ConstructionNode rootNode,
                                          IQTree child)

Specified by:

visitConstruction in interface IQVisitor<Optional<IQTree>>

visitAggregation

public Optional<IQTree> visitAggregation(AggregationNode aggregationNode,
                                         IQTree child)

Specified by:

visitAggregation in interface IQVisitor<Optional<IQTree>>

visitPassingUnaryNode

protected Optional<IQTree> visitPassingUnaryNode(UnaryOperatorNode rootNode,
                                                 IQTree child)

visitFilter

public Optional<IQTree> visitFilter(FilterNode rootNode,
                                    IQTree child)

NB: focuses on the expressionToPushDown, NOT on pushing down its own expression

Specified by:

visitFilter in interface IQVisitor<Optional<IQTree>>

visitDistinct

public Optional<IQTree> visitDistinct(DistinctNode rootNode,
                                      IQTree child)

Specified by:

visitDistinct in interface IQVisitor<Optional<IQTree>>

visitSlice

public Optional<IQTree> visitSlice(SliceNode sliceNode,
                                   IQTree child)

The slice blocks

Specified by:

visitSlice in interface IQVisitor<Optional<IQTree>>

visitOrderBy

public Optional<IQTree> visitOrderBy(OrderByNode rootNode,
                                     IQTree child)

Specified by:

visitOrderBy in interface IQVisitor<Optional<IQTree>>

visitNonStandardUnaryNode

public Optional<IQTree> visitNonStandardUnaryNode(UnaryOperatorNode rootNode,
                                                  IQTree child)

Blocks by default

Specified by:

visitNonStandardUnaryNode in interface IQVisitor<Optional<IQTree>>

visitLeftJoin

public Optional<IQTree> visitLeftJoin(LeftJoinNode rootNode,
                                      IQTree leftChild,
                                      IQTree rightChild)

Only pushes on the left TODO: consider pushing on the right safe expressions

Specified by:

visitLeftJoin in interface IQVisitor<Optional<IQTree>>

visitNonStandardBinaryNonCommutativeNode

public Optional<IQTree> visitNonStandardBinaryNonCommutativeNode(BinaryNonCommutativeOperatorNode rootNode,
                                                                 IQTree leftChild,
                                                                 IQTree rightChild)

Blocks by default

Specified by:

visitNonStandardBinaryNonCommutativeNode in interface IQVisitor<Optional<IQTree>>

visitInnerJoin

public Optional<IQTree> visitInnerJoin(InnerJoinNode rootNode,
                                       it.unibz.inf.ontop.com.google.common.collect.ImmutableList<IQTree> children)

Specified by:

visitInnerJoin in interface IQVisitor<Optional<IQTree>>

visitUnion

public Optional<IQTree> visitUnion(UnionNode rootNode,
                                   it.unibz.inf.ontop.com.google.common.collect.ImmutableList<IQTree> children)

Specified by:

visitUnion in interface IQVisitor<Optional<IQTree>>

visitNonStandardNaryNode

public Optional<IQTree> visitNonStandardNaryNode(NaryOperatorNode rootNode,
                                                 it.unibz.inf.ontop.com.google.common.collect.ImmutableList<IQTree> children)

Blocks by default

Specified by:

visitNonStandardNaryNode in interface IQVisitor<Optional<IQTree>>

visitIntensionalData

public Optional<IQTree> visitIntensionalData(IntensionalDataNode dataNode)

Specified by:

visitIntensionalData in interface IQVisitor<Optional<IQTree>>

visitExtensionalData

public Optional<IQTree> visitExtensionalData(ExtensionalDataNode dataNode)

Specified by:

visitExtensionalData in interface IQVisitor<Optional<IQTree>>

visitEmpty

public Optional<IQTree> visitEmpty(EmptyNode node)

Specified by:

visitEmpty in interface IQVisitor<Optional<IQTree>>

visitTrue

public Optional<IQTree> visitTrue(TrueNode node)

Specified by:

visitTrue in interface IQVisitor<Optional<IQTree>>

visitNative

public Optional<IQTree> visitNative(NativeNode nativeNode)

Specified by:

visitNative in interface IQVisitor<Optional<IQTree>>

visitNonStandardLeafNode

public Optional<IQTree> visitNonStandardLeafNode(LeafIQTree leafNode)

Specified by:

visitNonStandardLeafNode in interface IQVisitor<Optional<IQTree>>