spring-data-jpa SpecificationComposition 源码
spring-data-jpa SpecificationComposition 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/domain/SpecificationComposition.java
/*
* Copyright 2018-2022 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.jpa.domain;
import java.io.Serializable;
import jakarta.persistence.criteria.CriteriaBuilder;
import jakarta.persistence.criteria.CriteriaQuery;
import jakarta.persistence.criteria.Predicate;
import jakarta.persistence.criteria.Root;
import org.springframework.lang.Nullable;
/**
* Helper class to support specification compositions.
*
* @author Sebastian Staudt
* @author Oliver Gierke
* @author Jens Schauder
* @author Mark Paluch
* @see Specification
* @since 2.2
*/
class SpecificationComposition {
interface Combiner extends Serializable {
Predicate combine(CriteriaBuilder builder, @Nullable Predicate lhs, @Nullable Predicate rhs);
}
static <T> Specification<T> composed(@Nullable Specification<T> lhs, @Nullable Specification<T> rhs,
Combiner combiner) {
return (root, query, builder) -> {
Predicate thisPredicate = toPredicate(lhs, root, query, builder);
Predicate otherPredicate = toPredicate(rhs, root, query, builder);
if (thisPredicate == null) {
return otherPredicate;
}
return otherPredicate == null ? thisPredicate : combiner.combine(builder, thisPredicate, otherPredicate);
};
}
@Nullable
private static <T> Predicate toPredicate(@Nullable Specification<T> specification, Root<T> root, CriteriaQuery<?> query,
CriteriaBuilder builder) {
return specification == null ? null : specification.toPredicate(root, query, builder);
}
}
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