spring-data-jpa CollectionAwareProjectionFactory 源码
spring-data-jpa CollectionAwareProjectionFactory 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/projection/CollectionAwareProjectionFactory.java
/*
* Copyright 2017-2022 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.projection;
import java.beans.PropertyDescriptor;
import java.util.Collection;
import java.util.Map;
import org.springframework.data.projection.ProjectionInformation;
import org.springframework.data.projection.SpelAwareProxyProjectionFactory;
/**
* A {@link org.springframework.data.projection.ProjectionFactory} considering projections containing collections or
* maps to be open.
*
* @author Jens Schauder
* @author Oliver Gierke
*/
public class CollectionAwareProjectionFactory extends SpelAwareProxyProjectionFactory {
@Override
protected ProjectionInformation createProjectionInformation(Class<?> projectionType) {
return new CollectionAwareProjectionInformation(projectionType);
}
private static class CollectionAwareProjectionInformation extends SpelAwareProjectionInformation {
CollectionAwareProjectionInformation(Class<?> projectionType) {
super(projectionType);
}
@Override
protected boolean isInputProperty(PropertyDescriptor descriptor) {
if (!super.isInputProperty(descriptor)) {
return false;
}
return !(Collection.class.isAssignableFrom(descriptor.getPropertyType()) //
|| Map.class.isAssignableFrom(descriptor.getPropertyType()));
}
}
}
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