spring-data-jpa EntityGraphFactory 源码
spring-data-jpa EntityGraphFactory 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/support/EntityGraphFactory.java
/*
* Copyright 2021-2022 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.repository.support;
import java.util.Set;
import jakarta.persistence.EntityGraph;
import jakarta.persistence.EntityManager;
import jakarta.persistence.Subgraph;
import org.springframework.data.mapping.PropertyPath;
/**
* Factory class to create an {@link EntityGraph} from a collection of property paths.
*
* @author Jens Schauder
* @since 2.6
*/
abstract class EntityGraphFactory {
public static final String HINT = "javax.persistence.fetchgraph";
/**
* Create an {@link EntityGraph} from a collection of properties.
*
* @param domainType
* @param properties
*/
public static <T> EntityGraph<T> create(EntityManager entityManager, Class<T> domainType, Set<String> properties) {
EntityGraph<T> entityGraph = entityManager.createEntityGraph(domainType);
for (String property : properties) {
Subgraph<Object> current = null;
for (PropertyPath path : PropertyPath.from(property, domainType)) {
if (path.hasNext()) {
current = current == null ? entityGraph.addSubgraph(path.getSegment())
: current.addSubgraph(path.getSegment());
continue;
}
if (current == null) {
entityGraph.addAttributeNodes(path.getSegment());
} else {
current.addAttributeNodes(path.getSegment());
}
}
}
return entityGraph;
}
}
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