spring DefaultBindConstructorProvider 源码
springboot DefaultBindConstructorProvider 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/bind/DefaultBindConstructorProvider.java
/*
* Copyright 2012-2020 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.reflect.Constructor;
import java.lang.reflect.Modifier;
import org.springframework.beans.BeanUtils;
import org.springframework.core.KotlinDetector;
/**
* Default {@link BindConstructorProvider} implementation.
*
* @author Madhura Bhave
* @author Phillip Webb
*/
class DefaultBindConstructorProvider implements BindConstructorProvider {
@Override
public Constructor<?> getBindConstructor(Bindable<?> bindable, boolean isNestedConstructorBinding) {
Class<?> type = bindable.getType().resolve();
if (bindable.getValue() != null || type == null) {
return null;
}
if (KotlinDetector.isKotlinPresent() && KotlinDetector.isKotlinType(type)) {
return getDeducedKotlinConstructor(type);
}
Constructor<?>[] constructors = type.getDeclaredConstructors();
if (constructors.length == 1 && constructors[0].getParameterCount() > 0) {
return constructors[0];
}
Constructor<?> constructor = null;
for (Constructor<?> candidate : constructors) {
if (!Modifier.isPrivate(candidate.getModifiers())) {
if (constructor != null) {
return null;
}
constructor = candidate;
}
}
if (constructor != null && constructor.getParameterCount() > 0) {
return constructor;
}
return null;
}
private Constructor<?> getDeducedKotlinConstructor(Class<?> type) {
Constructor<?> primaryConstructor = BeanUtils.findPrimaryConstructor(type);
if (primaryConstructor != null && primaryConstructor.getParameterCount() > 0) {
return primaryConstructor;
}
return null;
}
}
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- 所属分类： 后端技术
- 本文标签： Spring Boot Java Spring
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