spring IndexedElementsBinder 源码
springboot IndexedElementsBinder 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/bind/IndexedElementsBinder.java
/*
* Copyright 2012-2022 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.boot.context.properties.bind;
import java.lang.annotation.Annotation;
import java.util.Collection;
import java.util.List;
import java.util.TreeSet;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import org.springframework.boot.context.properties.bind.Binder.Context;
import org.springframework.boot.context.properties.source.ConfigurationProperty;
import org.springframework.boot.context.properties.source.ConfigurationPropertyName;
import org.springframework.boot.context.properties.source.ConfigurationPropertyName.Form;
import org.springframework.boot.context.properties.source.ConfigurationPropertySource;
import org.springframework.boot.context.properties.source.IterableConfigurationPropertySource;
import org.springframework.core.ResolvableType;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
/**
* Base class for {@link AggregateBinder AggregateBinders} that read a sequential run of
* indexed items.
*
* @param <T> the type being bound
* @author Phillip Webb
* @author Madhura Bhave
*/
abstract class IndexedElementsBinder<T> extends AggregateBinder<T> {
private static final String INDEX_ZERO = "[0]";
IndexedElementsBinder(Context context) {
super(context);
}
@Override
protected boolean isAllowRecursiveBinding(ConfigurationPropertySource source) {
return source == null || source instanceof IterableConfigurationPropertySource;
}
/**
* Bind indexed elements to the supplied collection.
* @param name the name of the property to bind
* @param target the target bindable
* @param elementBinder the binder to use for elements
* @param aggregateType the aggregate type, may be a collection or an array
* @param elementType the element type
* @param result the destination for results
*/
protected final void bindIndexed(ConfigurationPropertyName name, Bindable<?> target,
AggregateElementBinder elementBinder, ResolvableType aggregateType, ResolvableType elementType,
IndexedCollectionSupplier result) {
for (ConfigurationPropertySource source : getContext().getSources()) {
bindIndexed(source, name, target, elementBinder, result, aggregateType, elementType);
if (result.wasSupplied() && result.get() != null) {
return;
}
}
}
private void bindIndexed(ConfigurationPropertySource source, ConfigurationPropertyName root, Bindable<?> target,
AggregateElementBinder elementBinder, IndexedCollectionSupplier collection, ResolvableType aggregateType,
ResolvableType elementType) {
ConfigurationProperty property = source.getConfigurationProperty(root);
if (property != null) {
getContext().setConfigurationProperty(property);
bindValue(target, collection.get(), aggregateType, elementType, property.getValue());
}
else {
bindIndexed(source, root, elementBinder, collection, elementType);
}
}
private void bindValue(Bindable<?> target, Collection<Object> collection, ResolvableType aggregateType,
ResolvableType elementType, Object value) {
if (value == null || (value instanceof CharSequence charSequence && charSequence.isEmpty())) {
return;
}
Object aggregate = convert(value, aggregateType, target.getAnnotations());
ResolvableType collectionType = ResolvableType.forClassWithGenerics(collection.getClass(), elementType);
Collection<Object> elements = convert(aggregate, collectionType);
collection.addAll(elements);
}
private void bindIndexed(ConfigurationPropertySource source, ConfigurationPropertyName root,
AggregateElementBinder elementBinder, IndexedCollectionSupplier collection, ResolvableType elementType) {
MultiValueMap<String, ConfigurationPropertyName> knownIndexedChildren = getKnownIndexedChildren(source, root);
for (int i = 0; i < Integer.MAX_VALUE; i++) {
ConfigurationPropertyName name = root.append((i != 0) ? "[" + i + "]" : INDEX_ZERO);
Object value = elementBinder.bind(name, Bindable.of(elementType), source);
if (value == null) {
break;
}
knownIndexedChildren.remove(name.getLastElement(Form.UNIFORM));
collection.get().add(value);
}
assertNoUnboundChildren(source, knownIndexedChildren);
}
private MultiValueMap<String, ConfigurationPropertyName> getKnownIndexedChildren(ConfigurationPropertySource source,
ConfigurationPropertyName root) {
MultiValueMap<String, ConfigurationPropertyName> children = new LinkedMultiValueMap<>();
if (!(source instanceof IterableConfigurationPropertySource iterableSource)) {
return children;
}
for (ConfigurationPropertyName name : iterableSource.filter(root::isAncestorOf)) {
ConfigurationPropertyName choppedName = name.chop(root.getNumberOfElements() + 1);
if (choppedName.isLastElementIndexed()) {
String key = choppedName.getLastElement(Form.UNIFORM);
children.add(key, name);
}
}
return children;
}
private void assertNoUnboundChildren(ConfigurationPropertySource source,
MultiValueMap<String, ConfigurationPropertyName> children) {
if (!children.isEmpty()) {
throw new UnboundConfigurationPropertiesException(children.values().stream().flatMap(List::stream)
.map(source::getConfigurationProperty).collect(Collectors.toCollection(TreeSet::new)));
}
}
private <C> C convert(Object value, ResolvableType type, Annotation... annotations) {
value = getContext().getPlaceholdersResolver().resolvePlaceholders(value);
return getContext().getConverter().convert(value, type, annotations);
}
/**
* {@link AggregateBinder.AggregateSupplier AggregateSupplier} for an indexed
* collection.
*/
protected static class IndexedCollectionSupplier extends AggregateSupplier<Collection<Object>> {
public IndexedCollectionSupplier(Supplier<Collection<Object>> supplier) {
super(supplier);
}
}
}
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spring AggregateElementBinder 源码
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- 本文标签: Spring Boot Spring Java
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