001/*
002 * Copyright 2002-2019 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 *      https://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.context.annotation;
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 one or more <em>component classes</em> to import &mdash; typically
027 * {@link Configuration @Configuration} classes.
028 *
029 * <p>Provides functionality equivalent to the {@code <import/>} element in Spring XML.
030 * Allows for importing {@code @Configuration} classes, {@link ImportSelector} and
031 * {@link ImportBeanDefinitionRegistrar} implementations, as well as regular component
032 * classes (as of 4.2; analogous to {@link AnnotationConfigApplicationContext#register}).
033 *
034 * <p>{@code @Bean} definitions declared in imported {@code @Configuration} classes should be
035 * accessed by using {@link org.springframework.beans.factory.annotation.Autowired @Autowired}
036 * injection. Either the bean itself can be autowired, or the configuration class instance
037 * declaring the bean can be autowired. The latter approach allows for explicit, IDE-friendly
038 * navigation between {@code @Configuration} class methods.
039 *
040 * <p>May be declared at the class level or as a meta-annotation.
041 *
042 * <p>If XML or other non-{@code @Configuration} bean definition resources need to be
043 * imported, use the {@link ImportResource @ImportResource} annotation instead.
044 *
045 * @author Chris Beams
046 * @author Juergen Hoeller
047 * @since 3.0
048 * @see Configuration
049 * @see ImportSelector
050 * @see ImportBeanDefinitionRegistrar
051 * @see ImportResource
052 */
053@Target(ElementType.TYPE)
054@Retention(RetentionPolicy.RUNTIME)
055@Documented
056public @interface Import {
057
058        /**
059         * {@link Configuration @Configuration}, {@link ImportSelector},
060         * {@link ImportBeanDefinitionRegistrar}, or regular component classes to import.
061         */
062        Class<?>[] value();
063
064}