spring-data-jpa JpaEntityInformationSupport 源码
spring-data-jpa JpaEntityInformationSupport 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/support/JpaEntityInformationSupport.java
/*
* Copyright 2011-2022 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 jakarta.persistence.EntityManager;
import jakarta.persistence.PersistenceUnitUtil;
import jakarta.persistence.metamodel.Metamodel;
import org.springframework.data.domain.Persistable;
import org.springframework.data.jpa.repository.query.DefaultJpaEntityMetadata;
import org.springframework.data.jpa.repository.query.JpaEntityMetadata;
import org.springframework.data.repository.core.support.AbstractEntityInformation;
import org.springframework.util.Assert;
/**
* Base class for {@link JpaEntityInformation} implementations to share common method implementations.
*
* @author Oliver Gierke
* @author Mark Paluch
* @author Greg Turnquist
*/
public abstract class JpaEntityInformationSupport<T, ID> extends AbstractEntityInformation<T, ID>
implements JpaEntityInformation<T, ID> {
private JpaEntityMetadata<T> metadata;
/**
* Creates a new {@link JpaEntityInformationSupport} with the given domain class.
*
* @param domainClass must not be {@literal null}.
*/
public JpaEntityInformationSupport(Class<T> domainClass) {
super(domainClass);
this.metadata = new DefaultJpaEntityMetadata<>(domainClass);
}
/**
* Creates a {@link JpaEntityInformation} for the given domain class and {@link EntityManager}.
*
* @param domainClass must not be {@literal null}.
* @param em must not be {@literal null}.
* @return
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public static <T> JpaEntityInformation<T, ?> getEntityInformation(Class<T> domainClass, EntityManager em) {
Assert.notNull(domainClass, "Domain class must not be null");
Assert.notNull(em, "EntityManager must not be null");
Metamodel metamodel = em.getMetamodel();
PersistenceUnitUtil persistenceUnitUtil = em.getEntityManagerFactory().getPersistenceUnitUtil();
if (Persistable.class.isAssignableFrom(domainClass)) {
return new JpaPersistableEntityInformation(domainClass, metamodel, persistenceUnitUtil);
} else {
return new JpaMetamodelEntityInformation(domainClass, metamodel, persistenceUnitUtil);
}
}
@Override
public String getEntityName() {
return metadata.getEntityName();
}
}
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