spring-data-jpa BeanFactoryQueryRewriterProvider 源码
spring-data-jpa BeanFactoryQueryRewriterProvider 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/BeanFactoryQueryRewriterProvider.java
/*
* Copyright 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.query;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.data.jpa.repository.QueryRewriter;
import org.springframework.data.util.Lazy;
/**
* A {@link BeanFactory}-based {@link QueryRewriterProvider}.
*
* @author Greg Turnquist
* @author Mark Paluch
* @since 3.0
*/
public class BeanFactoryQueryRewriterProvider implements QueryRewriterProvider {
private final BeanFactory beanFactory;
public BeanFactoryQueryRewriterProvider(BeanFactory beanFactory) {
this.beanFactory = beanFactory;
}
@Override
@SuppressWarnings("unchecked")
public QueryRewriter getQueryRewriter(JpaQueryMethod method) {
Class<? extends QueryRewriter> queryRewriter = method.getQueryRewriter();
if (queryRewriter == QueryRewriter.IdentityQueryRewriter.class) {
return QueryRewriter.IdentityQueryRewriter.INSTANCE;
}
Lazy<QueryRewriter> rewriter = Lazy.of(() -> beanFactory.getBeanProvider((Class<QueryRewriter>) queryRewriter)
.getIfAvailable(() -> BeanUtils.instantiateClass(queryRewriter)));
return new DelegatingQueryRewriter(rewriter);
}
}
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