spring-data-jpa FluentQuerySupport 源码
spring-data-jpa FluentQuerySupport 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/support/FluentQuerySupport.java
/*
* Copyright 2021-2022 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.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.function.Function;
import org.springframework.core.convert.support.DefaultConversionService;
import org.springframework.data.domain.Sort;
import org.springframework.data.projection.SpelAwareProxyProjectionFactory;
import org.springframework.lang.Nullable;
/**
* Supporting class containing some state and convenience methods for building and executing fluent queries.
*
* @param <R> The resulting type of the query.
* @author Greg Turnquist
* @author Jens Schauder
* @since 2.6
*/
abstract class FluentQuerySupport<S, R> {
protected final Class<R> resultType;
protected final Sort sort;
protected final Set<String> properties;
protected final Class<S> entityType;
private final SpelAwareProxyProjectionFactory projectionFactory = new SpelAwareProxyProjectionFactory();
FluentQuerySupport(Class<R> resultType, Sort sort, @Nullable Collection<String> properties, Class<S> entityType) {
this.resultType = resultType;
this.sort = sort;
if (properties != null) {
this.properties = new HashSet<>(properties);
} else {
this.properties = Collections.emptySet();
}
this.entityType = entityType;
}
final Collection<String> mergeProperties(Collection<String> additionalProperties) {
Set<String> newProperties = new HashSet<>();
newProperties.addAll(properties);
newProperties.addAll(additionalProperties);
return Collections.unmodifiableCollection(newProperties);
}
@SuppressWarnings("unchecked")
final Function<Object, R> getConversionFunction(Class<S> inputType, Class<R> targetType) {
if (targetType.isAssignableFrom(inputType)) {
return (Function<Object, R>) Function.identity();
}
if (targetType.isInterface()) {
return o -> projectionFactory.createProjection(targetType, o);
}
return o -> DefaultConversionService.getSharedInstance().convert(o, targetType);
}
}
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