spring-data-jpa BeanManagerQueryRewriterProvider 源码
spring-data-jpa BeanManagerQueryRewriterProvider 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/cdi/BeanManagerQueryRewriterProvider.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.cdi;
import jakarta.enterprise.context.spi.CreationalContext;
import jakarta.enterprise.inject.spi.Bean;
import jakarta.enterprise.inject.spi.BeanManager;
import java.util.Iterator;
import org.springframework.beans.BeanUtils;
import org.springframework.data.jpa.repository.QueryRewriter;
import org.springframework.data.jpa.repository.query.DelegatingQueryRewriter;
import org.springframework.data.jpa.repository.query.JpaQueryMethod;
import org.springframework.data.jpa.repository.query.QueryRewriterProvider;
import org.springframework.data.util.Lazy;
/**
* A {@link BeanManager}-based {@link QueryRewriterProvider}.
*
* @author Greg Turnquist
* @author Mark Paluch
* @since 3.0
*/
public class BeanManagerQueryRewriterProvider implements QueryRewriterProvider {
private final BeanManager beanManager;
public BeanManagerQueryRewriterProvider(BeanManager beanManager) {
this.beanManager = beanManager;
}
@Override
@SuppressWarnings("unchecked")
public QueryRewriter getQueryRewriter(JpaQueryMethod method) {
Class<? extends QueryRewriter> queryRewriter = method.getQueryRewriter();
if (queryRewriter == QueryRewriter.IdentityQueryRewriter.class) {
return QueryRewriter.IdentityQueryRewriter.INSTANCE;
}
Iterator<Bean<?>> iterator = beanManager.getBeans(queryRewriter).iterator();
if (iterator.hasNext()) {
Bean<QueryRewriter> bean = (Bean<QueryRewriter>) iterator.next();
CreationalContext<QueryRewriter> context = beanManager.createCreationalContext(bean);
Lazy<QueryRewriter> rewriter = Lazy
.of(() -> (QueryRewriter) beanManager.getReference(bean, queryRewriter, context));
return new DelegatingQueryRewriter(rewriter);
}
return BeanUtils.instantiateClass(queryRewriter);
}
}
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