com.exasol.sql.expression.predicate

Class IsNullPredicate

java.lang.Object

com.exasol.sql.expression.predicate.AbstractPredicate

com.exasol.sql.expression.predicate.IsNullPredicate

All Implemented Interfaces:

BooleanExpression, Predicate, ValueExpression

public class IsNullPredicate
extends AbstractPredicate

A class that represents a IS [NOT] NULL predicate.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	IsNullPredicate.IsNullPredicateOperator An operator for IsNullPredicate class.

Constructor Summary

Constructors

Constructor and Description
IsNullPredicate(IsNullPredicate.IsNullPredicateOperator operator, ValueExpression operand) Creates a new instance of IsNullPredicate for IS [NOT] NULL predicate.
IsNullPredicate(ValueExpression operand) Creates a new instance of IsNullPredicate for IS NULL predicate.

Method Summary

Modifier and Type	Method and Description
void	accept(PredicateVisitor visitor) Accepts PredicateVisitor.
ValueExpression	getOperand() Returns the value expression to be checked for null.

Methods inherited from class com.exasol.sql.expression.predicate.AbstractPredicate

accept, accept, getOperator

Methods inherited from class java.lang.Object

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

Constructor Detail

IsNullPredicate

public IsNullPredicate(ValueExpression operand)

Creates a new instance of IsNullPredicate for IS NULL predicate.

Parameters:

operand - value expression to check for null

IsNullPredicate

public IsNullPredicate(IsNullPredicate.IsNullPredicateOperator operator,
                       ValueExpression operand)

Creates a new instance of IsNullPredicate for IS [NOT] NULL predicate.

Parameters:

operator - predicate operator

operand - value expression to check for null

Method Detail

getOperand

public ValueExpression getOperand()

Returns the value expression to be checked for null.

Returns:

value expression operand

accept

public void accept(PredicateVisitor visitor)

Description copied from interface: Predicate

Accepts PredicateVisitor.

Parameters:

visitor - predicate visitor to accept