58 lines
2 KiB
Java
58 lines
2 KiB
Java
/*
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* Copyright (C) 2009 The JSR-330 Expert Group
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package javax.inject;
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import java.lang.annotation.Target;
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import java.lang.annotation.Retention;
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import java.lang.annotation.Documented;
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import static java.lang.annotation.RetentionPolicy.RUNTIME;
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import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
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/**
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* Identifies qualifier annotations. Anyone can define a new qualifier. A
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* qualifier annotation:
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*
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* <ul>
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* <li>is annotated with {@code @Qualifier}, {@code @Retention(RUNTIME)},
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* and typically {@code @Documented}.</li>
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* <li>can have attributes.</li>
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* <li>may be part of the public API, much like the dependency type, but
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* unlike implementation types which needn't be part of the public
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* API.</li>
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* <li>may have restricted usage if annotated with {@code @Target}. While
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* this specification covers applying qualifiers to fields and
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* parameters only, some injector configurations might use qualifier
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* annotations in other places (on methods or classes for example).</li>
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* </ul>
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*
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* <p>For example:
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*
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* <pre>
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* @java.lang.annotation.Documented
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* @java.lang.annotation.Retention(RUNTIME)
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* @javax.inject.Qualifier
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* public @interface Leather {
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* Color color() default Color.TAN;
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* public enum Color { RED, BLACK, TAN }
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* }</pre>
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*
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* @see javax.inject.Named @Named
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*/
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@Target(ANNOTATION_TYPE)
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@Retention(RUNTIME)
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@Documented
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public @interface Qualifier {}
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