spring-data-jpa QueryRewriterProvider 源码
spring-data-jpa QueryRewriterProvider 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/QueryRewriterProvider.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.data.jpa.repository.QueryRewriter;
/**
* Provide a {@link QueryRewriter} based upon the {@link JpaQueryMethod}. {@code QueryRewriter} instances may be
* contextual or plain objects that are not attached to a bean factory or CDI context.
*
* @author Greg Turnquist
* @author Mark Paluch
* @since 3.0
* @see QueryRewriter
*/
public interface QueryRewriterProvider {
/**
* Return a simple {@code QueryRewriterProvider} that uses
* {@link org.springframework.beans.BeanUtils#instantiateClass(Class)} to obtain a {@link QueryRewriter} instance.
*
* @return a simple {@link QueryRewriterProvider}.
*/
static QueryRewriterProvider simple() {
return method -> {
Class<? extends QueryRewriter> queryRewriter = method.getQueryRewriter();
if (queryRewriter == QueryRewriter.IdentityQueryRewriter.class) {
return QueryRewriter.IdentityQueryRewriter.INSTANCE;
}
return BeanUtils.instantiateClass(queryRewriter);
};
}
/**
* Obtain an instance of {@link QueryRewriter} for a {@link JpaQueryMethod}.
*
* @param method the underlying JPA query method.
* @return a Java bean that implements {@link QueryRewriter}.
*/
QueryRewriter getQueryRewriter(JpaQueryMethod method);
}
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