/*
* Copyright 2012-2017 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
*
* http://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 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(BindContext context) {
super(context);
}
@Override
protected Object bind(ConfigurationPropertyName name, Bindable<?> target,
AggregateElementBinder elementBinder, Class<?> type) {
IndexedCollectionSupplier collection = new IndexedCollectionSupplier(
() -> CollectionFactory.createCollection(type, 0));
ResolvableType elementType = target.getType().asCollection().getGeneric();
bindIndexed(name, target, elementBinder, collection, target.getType(),
elementType);
if (collection.wasSupplied()) {
return collection.get();
}
return null;
}
@Override
protected Collection<Object> merge(Collection<Object> existing,
Collection<Object> additional) {
existing.clear();
existing.addAll(additional);
return existing;
}
}