spring ConstructorBinding 源码

  • 2022-08-12
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springboot ConstructorBinding 代码

文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConstructorBinding.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;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Annotation that can be used to indicate which constructor to use when binding
 * configuration properties using constructor arguments rather than by calling setters. A
 * single parameterized constructor implicitly indicates that constructor binding should
 * be used unless the constructor is annotated with `@Autowired`.
 * <p>
 * Note: To use constructor binding the class must be enabled using
 * {@link EnableConfigurationProperties @EnableConfigurationProperties} or configuration
 * property scanning. Constructor binding cannot be used with beans that are created by
 * the regular Spring mechanisms (e.g.
 * {@link org.springframework.stereotype.Component @Component} beans, beans created via
 * {@link org.springframework.context.annotation.Bean @Bean} methods or beans loaded using
 * {@link org.springframework.context.annotation.Import @Import}).
 *
 * @author Phillip Webb
 * @since 2.2.0
 * @see ConfigurationProperties
 */
@Target(ElementType.CONSTRUCTOR)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ConstructorBinding {

}

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