org.cxbox.api.data.dao.SpecificationUtils Maven / Gradle / Ivy

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/*
 * © OOO "SI IKS LAB", 2022-2023
 *
 * 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 org.cxbox.api.data.dao;

import java.util.Arrays;
import java.util.Objects;
import java.util.function.BinaryOperator;
import lombok.experimental.UtilityClass;
import org.springframework.data.jpa.domain.Specification;

@UtilityClass
public class SpecificationUtils {

	public static  Specification trueSpecification() {
		return Specification.where((root, cq, cb) -> cb.and());
	}

	public static  Specification falseSpecification() {
		return Specification.where((root, cq, cb) -> cb.or());
	}

	public static  BinaryOperator> and() {
		return (s1, s2) -> Specification.where(s1).and(s2);
	}

	public static  BinaryOperator> or() {
		return (s1, s2) -> Specification.where(s1).or(s2);
	}

	@SafeVarargs
	public static  Specification and(Specification... specs) {
		return Arrays.stream(specs).filter(Objects::nonNull).reduce(and()).orElse(trueSpecification());
	}

	@SafeVarargs
	public static  Specification or(Specification... specs) {
		return Arrays.stream(specs).filter(Objects::nonNull).reduce(or()).orElse(falseSpecification());
	}

}