it.unibz.inf.ontop.model.term.functionsymbol.db.impl

Class AbstractDBIsNullOrNotFunctionSymbol

java.lang.Object

it.unibz.inf.ontop.model.term.impl.PredicateImpl

it.unibz.inf.ontop.model.term.functionsymbol.impl.FunctionSymbolImpl

it.unibz.inf.ontop.model.term.functionsymbol.impl.BooleanFunctionSymbolImpl

it.unibz.inf.ontop.model.term.functionsymbol.db.impl.DBBooleanFunctionSymbolImpl

it.unibz.inf.ontop.model.term.functionsymbol.db.impl.AbstractDBIsNullOrNotFunctionSymbol

All Implemented Interfaces:

BooleanFunctionSymbol, DBBooleanFunctionSymbol, DBFunctionSymbol, DBFunctionSymbolSerializer, DBIsNullOrNotFunctionSymbol, FunctionSymbol, Predicate

Direct Known Subclasses:

MockupDBIsNullOrNotFunctionSymbolImpl

public abstract class AbstractDBIsNullOrNotFunctionSymbol
extends DBBooleanFunctionSymbolImpl
implements DBIsNullOrNotFunctionSymbol

Nested Class Summary

Nested classes/interfaces inherited from interface it.unibz.inf.ontop.model.term.functionsymbol.FunctionSymbol

FunctionSymbol.FunctionalTermNullability

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractDBIsNullOrNotFunctionSymbol(boolean isNull, DBTermType dbBooleanTermType, DBTermType rootDBTermType)

Method Summary

Modifier and Type	Method and Description
boolean	blocksNegation() Returns TRUE if the NOT operator has to stay ABOVE the expression (i.e.
protected ImmutableTerm	buildTermAfterEvaluation(com.google.common.collect.ImmutableList<ImmutableTerm> newTerms, TermFactory termFactory, VariableNullability variableNullability) By default, just build a new functional term.
boolean	canBePostProcessed(com.google.common.collect.ImmutableList<? extends ImmutableTerm> arguments) 1.
IncrementalEvaluation	evaluateIsNotNull(com.google.common.collect.ImmutableList<? extends ImmutableTerm> terms, TermFactory termFactory, VariableNullability variableNullability) Default implementation, can be overridden
boolean	isAlwaysInjectiveInTheAbsenceOfNonInjectiveFunctionalTerms() When the function symbol is, in the absence of non-injective functional sub-terms, sometimes but not always injective, please override isInjective(...)
boolean	isNullable(com.google.common.collect.ImmutableSet<Integer> nullableIndexes) By default, to be overridden by function symbols that supports tolerate NULL values
boolean	isTrueWhenNull()
ImmutableExpression	negate(com.google.common.collect.ImmutableList<? extends ImmutableTerm> subTerms, TermFactory termFactory) Usually NOT supported when the function symbol blocks negation.
protected boolean	tolerateNulls() Returns true if is not guaranteed to return NULL when one argument is NULL.

Methods inherited from class it.unibz.inf.ontop.model.term.functionsymbol.db.impl.DBBooleanFunctionSymbolImpl

inBrackets, isPreferringToBePostProcessedOverBeingBlocked, mayReturnNullWithoutNullArguments

Methods inherited from class it.unibz.inf.ontop.model.term.functionsymbol.impl.BooleanFunctionSymbolImpl

enableIfElseNullLifting, inferType, tryToLiftIfThenTerm, tryToLiftMagicNumbers

Methods inherited from class it.unibz.inf.ontop.model.term.functionsymbol.impl.FunctionSymbolImpl

analyzeInjectivity, canBeSafelyDecomposedIntoConjunction, decomposeInjectiveTopFunctionalTerm, evaluateNullability, evaluateStrictEq, evaluateStrictEqWithFunctionalTerm, evaluateStrictEqWithNonNullConstant, getExpectedBaseType, getExpectedBaseTypes, isAggregation, isDeterministic, isInjective, proposeProvenanceVariables, simplify, simplifyAsGuaranteedToBeNonNull, transformIntoRegularArguments, tryToLiftMagicNumbers

Methods inherited from class it.unibz.inf.ontop.model.term.impl.PredicateImpl

equals, getArity, getName, hashCode, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unibz.inf.ontop.model.term.functionsymbol.BooleanFunctionSymbol

simplify2VL

Methods inherited from interface it.unibz.inf.ontop.model.term.functionsymbol.db.DBFunctionSymbol

isPreferringToBePostProcessedOverBeingBlocked

Methods inherited from interface it.unibz.inf.ontop.model.term.functionsymbol.FunctionSymbol

analyzeInjectivity, evaluateNullability, evaluateStrictEq, getExpectedBaseType, inferType, isAggregation, isDeterministic, proposeProvenanceVariables, simplify, simplifyAsGuaranteedToBeNonNull

Methods inherited from interface it.unibz.inf.ontop.model.term.functionsymbol.Predicate

getArity, getName

Methods inherited from interface it.unibz.inf.ontop.model.term.functionsymbol.db.DBFunctionSymbolSerializer

getNativeDBString

Constructor Detail

AbstractDBIsNullOrNotFunctionSymbol

protected AbstractDBIsNullOrNotFunctionSymbol(boolean isNull,
                                              DBTermType dbBooleanTermType,
                                              DBTermType rootDBTermType)

Method Detail

blocksNegation

public boolean blocksNegation()

Description copied from interface: BooleanFunctionSymbol

Returns TRUE if the NOT operator has to stay ABOVE the expression (i.e. cannot lead to a change in the operator or cannot be delegated to sub-expressions)

Specified by:

blocksNegation in interface BooleanFunctionSymbol

negate

public ImmutableExpression negate(com.google.common.collect.ImmutableList<? extends ImmutableTerm> subTerms,
                                  TermFactory termFactory)

Description copied from interface: BooleanFunctionSymbol

Usually NOT supported when the function symbol blocks negation. Please use ImmutableExpression.negate() instead.

Specified by:

negate in interface BooleanFunctionSymbol

isAlwaysInjectiveInTheAbsenceOfNonInjectiveFunctionalTerms

public boolean isAlwaysInjectiveInTheAbsenceOfNonInjectiveFunctionalTerms()

Description copied from class: FunctionSymbolImpl

When the function symbol is, in the absence of non-injective functional sub-terms, sometimes but not always injective, please override isInjective(...)

Specified by:

isAlwaysInjectiveInTheAbsenceOfNonInjectiveFunctionalTerms in class FunctionSymbolImpl

canBePostProcessed

public boolean canBePostProcessed(com.google.common.collect.ImmutableList<? extends ImmutableTerm> arguments)

Description copied from interface: FunctionSymbol

1. When a functional term simplifies itself in a BOTTOM-UP manner: Returns true if is guaranteed to "simplify itself" as a Constant when receiving Constants as arguments (outside the optimization phase) . 2. When a functional term simplifies itself in a TOP-DOWN manner (e.g. IF-THEN-ELSE functional terms): The permission for post-processing may depend on the ability of sub-functional terms to be post-processed or safely evaluated by the DB engine. (Recall that top-down evaluation allows some arguments not to be evaluated when their pre-conditions are not met. This is particularly valuable for preventing fatal errors).

Specified by:

canBePostProcessed in interface FunctionSymbol

buildTermAfterEvaluation

protected ImmutableTerm buildTermAfterEvaluation(com.google.common.collect.ImmutableList<ImmutableTerm> newTerms,
                                                 TermFactory termFactory,
                                                 VariableNullability variableNullability)

Description copied from class: FunctionSymbolImpl

By default, just build a new functional term. NB: If the function symbol does not tolerate NULL values, no need to handle them here.

Overrides:

buildTermAfterEvaluation in class BooleanFunctionSymbolImpl

isNullable

public boolean isNullable(com.google.common.collect.ImmutableSet<Integer> nullableIndexes)

Description copied from class: FunctionSymbolImpl

By default, to be overridden by function symbols that supports tolerate NULL values

Specified by:

isNullable in interface FunctionSymbol

Overrides:

isNullable in class FunctionSymbolImpl

tolerateNulls

protected boolean tolerateNulls()

Description copied from class: FunctionSymbolImpl

Returns true if is not guaranteed to return NULL when one argument is NULL. Can be the case for some function symbols that are rejecting certain cases and therefore refuse to simplify themselves, e.g. RDF(NULL,IRI) is invalid and therefore cannot be simplified.

Specified by:

tolerateNulls in class FunctionSymbolImpl

isTrueWhenNull

public boolean isTrueWhenNull()

Specified by:

isTrueWhenNull in interface DBIsNullOrNotFunctionSymbol

evaluateIsNotNull

public IncrementalEvaluation evaluateIsNotNull(com.google.common.collect.ImmutableList<? extends ImmutableTerm> terms,
                                               TermFactory termFactory,
                                               VariableNullability variableNullability)

Description copied from class: FunctionSymbolImpl

Default implementation, can be overridden

Specified by:

evaluateIsNotNull in interface FunctionSymbol

Overrides:

evaluateIsNotNull in class FunctionSymbolImpl