org.springframework.data.relational.core.sql.IsNull Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of spring-data-relational Show documentation
Show all versions of spring-data-relational Show documentation
Spring Data Relational support
/*
* Copyright 2019-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.relational.core.sql;
import org.springframework.util.Assert;
/**
* {@code IS NULL} {@link Condition}.
*
* @author Jens Schauder
* @since 1.1
*/
public class IsNull extends AbstractSegment implements Condition {
private final Expression expression;
private final boolean negated;
private IsNull(Expression expression) {
this(expression, false);
}
private IsNull(Expression expression, boolean negated) {
super(expression);
this.expression = expression;
this.negated = negated;
}
/**
* Creates a new {@link IsNull} expression.
*
* @param expression must not be {@literal null}.
* @return
*/
public static IsNull create(Expression expression) {
Assert.notNull(expression, "Expression must not be null");
return new IsNull(expression);
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.sql.Condition#not()
*/
@Override
public Condition not() {
return new IsNull(expression, !negated);
}
public boolean isNegated() {
return negated;
}
/*
* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return expression + (negated ? " IS NOT NULL" : " IS NULL");
}
}