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

Class NullRejectingDBConcatFunctionSymbol

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.db.impl.AbstractTypedDBFunctionSymbol

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

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

All Implemented Interfaces:

DBConcatFunctionSymbol, DBFunctionSymbol, DBFunctionSymbolSerializer, FunctionSymbol, Predicate, Serializable

public class NullRejectingDBConcatFunctionSymbol
extends AbstractDBConcatFunctionSymbol

See Also:

Serialized Form

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	NullRejectingDBConcatFunctionSymbol(String nameInDialect, int arity, DBTermType dbStringType, DBTermType rootDBTermType, boolean isOperator)
protected	NullRejectingDBConcatFunctionSymbol(String nameInDialect, int arity, DBTermType dbStringType, DBTermType rootDBTermType, DBFunctionSymbolSerializer serializer)

Method Summary

Modifier and Type	Method and Description
boolean	canBePostProcessed(it.unibz.inf.ontop.com.google.common.collect.ImmutableList<? extends ImmutableTerm> arguments) 1.
protected String	extractString(Constant constant)
boolean	isAlwaysInjectiveInTheAbsenceOfNonInjectiveFunctionalTerms() When the function symbol is, in the absence of non-injective functional sub-terms, sometimes but not always injective, please override isInjective(...)

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

analyzeInjectivity, buildTermAfterEvaluation, getNativeDBString

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

getTargetType, inferType, isPreferringToBePostProcessedOverBeingBlocked, mayReturnNullWithoutNullArguments, tolerateNulls

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

canBeSafelyDecomposedIntoConjunction, decomposeInjectiveTopFunctionalTerm, enableIfElseNullLifting, evaluateIsNotNull, evaluateNullability, evaluateStrictEq, evaluateStrictEqWithFunctionalTerm, evaluateStrictEqWithNonNullConstant, getExpectedBaseType, getExpectedBaseTypes, isAggregation, isDeterministic, isInjective, isNullable, 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.db.DBFunctionSymbol

isPreferringToBePostProcessedOverBeingBlocked

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

evaluateIsNotNull, evaluateNullability, evaluateStrictEq, getExpectedBaseType, inferType, isAggregation, isDeterministic, isNullable, proposeProvenanceVariables, simplify, simplifyAsGuaranteedToBeNonNull

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

getArity, getName

Constructor Detail

NullRejectingDBConcatFunctionSymbol

protected NullRejectingDBConcatFunctionSymbol(String nameInDialect,
                                              int arity,
                                              DBTermType dbStringType,
                                              DBTermType rootDBTermType,
                                              boolean isOperator)

NullRejectingDBConcatFunctionSymbol

protected NullRejectingDBConcatFunctionSymbol(String nameInDialect,
                                              int arity,
                                              DBTermType dbStringType,
                                              DBTermType rootDBTermType,
                                              DBFunctionSymbolSerializer serializer)

Method Detail

extractString

protected String extractString(Constant constant)

Specified by:

extractString in class AbstractDBConcatFunctionSymbol

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(it.unibz.inf.ontop.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).