001/* 002 * Copyright 2012-2017 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.boot.context.properties; 018 019import java.lang.annotation.Documented; 020import java.lang.annotation.ElementType; 021import java.lang.annotation.Retention; 022import java.lang.annotation.RetentionPolicy; 023import java.lang.annotation.Target; 024 025/** 026 * Indicates that a field in a {@link ConfigurationProperties} object should be treated as 027 * if it were a nested type. This annotation has no bearing on the actual binding 028 * processes, but it is used by the {@code spring-boot-configuration-processor} as a hint 029 * that a field is not bound as a single value. When this is specified, a nested group is 030 * created for the field and its type is harvested. 031 * <p> 032 * This has no effect on collections and maps as these types are automatically identified. 033 * 034 * @author Stephane Nicoll 035 * @author Phillip Webb 036 * @since 1.2.0 037 */ 038@Target(ElementType.FIELD) 039@Retention(RetentionPolicy.RUNTIME) 040@Documented 041public @interface NestedConfigurationProperty { 042 043}