001/* 002 * Copyright 2002-2011 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.beans.factory.annotation; 018 019import java.lang.annotation.Documented; 020import java.lang.annotation.ElementType; 021import java.lang.annotation.Inherited; 022import java.lang.annotation.Retention; 023import java.lang.annotation.RetentionPolicy; 024import java.lang.annotation.Target; 025 026/** 027 * This annotation may be used on a field or parameter as a qualifier for 028 * candidate beans when autowiring. It may also be used to annotate other 029 * custom annotations that can then in turn be used as qualifiers. 030 * 031 * @author Mark Fisher 032 * @author Juergen Hoeller 033 * @since 2.5 034 * @see Autowired 035 */ 036@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.TYPE, ElementType.ANNOTATION_TYPE}) 037@Retention(RetentionPolicy.RUNTIME) 038@Inherited 039@Documented 040public @interface Qualifier { 041 042 String value() default ""; 043 044}