spring CollectionBinder 源码
springboot CollectionBinder 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/bind/CollectionBinder.java
/*
* Copyright 2012-2019 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.boot.context.properties.bind;
import java.util.Collection;
import java.util.List;
import java.util.function.Supplier;
import org.springframework.boot.context.properties.bind.Binder.Context;
import org.springframework.boot.context.properties.source.ConfigurationPropertyName;
import org.springframework.core.CollectionFactory;
import org.springframework.core.ResolvableType;
/**
* {@link AggregateBinder} for collections.
*
* @author Phillip Webb
* @author Madhura Bhave
*/
class CollectionBinder extends IndexedElementsBinder<Collection<Object>> {
CollectionBinder(Context context) {
super(context);
}
@Override
protected Object bindAggregate(ConfigurationPropertyName name, Bindable<?> target,
AggregateElementBinder elementBinder) {
Class<?> collectionType = (target.getValue() != null) ? List.class : target.getType().resolve(Object.class);
ResolvableType aggregateType = ResolvableType.forClassWithGenerics(List.class,
target.getType().asCollection().getGenerics());
ResolvableType elementType = target.getType().asCollection().getGeneric();
IndexedCollectionSupplier result = new IndexedCollectionSupplier(
() -> CollectionFactory.createCollection(collectionType, elementType.resolve(), 0));
bindIndexed(name, target, elementBinder, aggregateType, elementType, result);
if (result.wasSupplied()) {
return result.get();
}
return null;
}
@Override
protected Collection<Object> merge(Supplier<Collection<Object>> existing, Collection<Object> additional) {
Collection<Object> existingCollection = getExistingIfPossible(existing);
if (existingCollection == null) {
return additional;
}
try {
existingCollection.clear();
existingCollection.addAll(additional);
return copyIfPossible(existingCollection);
}
catch (UnsupportedOperationException ex) {
return createNewCollection(additional);
}
}
private Collection<Object> getExistingIfPossible(Supplier<Collection<Object>> existing) {
try {
return existing.get();
}
catch (Exception ex) {
return null;
}
}
private Collection<Object> copyIfPossible(Collection<Object> collection) {
try {
return createNewCollection(collection);
}
catch (Exception ex) {
return collection;
}
}
private Collection<Object> createNewCollection(Collection<Object> collection) {
Collection<Object> result = CollectionFactory.createCollection(collection.getClass(), collection.size());
result.addAll(collection);
return result;
}
}
相关信息
相关文章
spring AggregateElementBinder 源码
0
赞
- 所属分类: 后端技术
- 本文标签: Spring Boot Java Spring
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦