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/**
 *  Copyright (c) 1997-2013, tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.gnu.org/licenses/gpl.html
 *
 *  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.
 * --------------------------------------------------------------------------
 *  版权 (c) 1997-2013, tinygroup.org ([email protected]).
 *
 *  本开源软件遵循 GPL 3.0 协议;
 *  如果您不遵循此协议，则不被允许使用此文件。
 *  你可以从下面的地址获取完整的协议文本
 *
 *       http://www.gnu.org/licenses/gpl.html
 */
package javax.inject;

import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import java.lang.annotation.Documented;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static java.lang.annotation.ElementType.ANNOTATION_TYPE;

/**
 * Identifies qualifier annotations. Anyone can define a new qualifier. A
 * qualifier annotation:
 *
 * 
 *   is annotated with {@code @Qualifier}, {@code @Retention(RUNTIME)},
 *      and typically {@code @Documented}.
 *   can have attributes.
 *   may be part of the public API, much like the dependency type, but
 *      unlike implementation types which needn't be part of the public
 *      API.
 *   may have restricted usage if annotated with {@code @Target}. While
 *      this specification covers applying qualifiers to fields and
 *      parameters only, some injector configurations might use qualifier
 *      annotations in other places (on methods or classes for example).
 * 
 *
 * For example:
 *
 * 
 *   @java.lang.annotation.Documented
 *   @java.lang.annotation.Retention(RUNTIME)
 *   @javax.inject.Qualifier
 *   public @interface Leather {
 *     Color color() default Color.TAN;
 *     public enum Color { RED, BLACK, TAN }
 *   }
 *
 * @see Named @Named
 */
@Target(ANNOTATION_TYPE)
@Retention(RUNTIME)
@Documented
public @interface Qualifier {}