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An alternative API for filtering data with Spring MVC and Spring Data JPA. This library provides a custom HandlerMethodArgumentResolver that transforms HTTP parameters into a Specification object ready to use with Spring Data repositories.

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/**
 * Copyright 2014-2022 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
 *
 * http://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 net.kaczmarzyk.spring.data.jpa.domain;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;

import net.kaczmarzyk.spring.data.jpa.utils.QueryContext;


/**
 * Filers with "is null" where clause (e.g. {@code where nickName is null}).
 *
 * Does not require any http-parameters to be present, i.e. represents constant part of the query.
 *
 * @author Tomasz Kaczmarzyk
 *
 * @deprecated Consider using {@link net.kaczmarzyk.spring.data.jpa.domain.Null Null}
 */
@Deprecated
public class IsNull extends PathSpecification implements ZeroArgSpecification {

	private static final long serialVersionUID = 1L;

	public IsNull(QueryContext queryContext, String path, String[] args) {
		super(queryContext, path);
	}

	@Override
	public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder cb) {
		return cb.isNull(path(root));
	}

}