spring-data-jpa MutableQueryHints 源码
spring-data-jpa MutableQueryHints 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/support/MutableQueryHints.java
/*
* Copyright 2020-2022 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.List;
import java.util.Map;
import java.util.function.BiConsumer;
import jakarta.persistence.EntityManager;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
/**
* Mutable implementation of {@link QueryHints}, without the Option to switch between
* {@link #forCounts()}/{@link #withFetchGraphs(EntityManager)} hints.
*
* @author Jens Schauder
* @author Mark Paluch
* @since 2.4
* @see QueryHints
*/
public class MutableQueryHints implements QueryHints {
private final MultiValueMap<String, Object> values = new LinkedMultiValueMap<>();
@Override
public QueryHints withFetchGraphs(EntityManager em) {
return this;
}
@Override
public QueryHints forCounts() {
return this;
}
@Override
public void forEach(BiConsumer<String, Object> action) {
for (Map.Entry<String, List<Object>> entry : values.entrySet()) {
for (Object value : entry.getValue()) {
action.accept(entry.getKey(), value);
}
}
}
/**
* Add a new key-value pair for a hint.
*
* @param name
* @param value
*/
public void add(String name, Object value) {
values.add(name, value);
}
MultiValueMap<String, Object> getValues() {
return values;
}
}
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