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Diffstat (limited to 'src/javax/inject/Qualifier.java')
-rw-r--r-- | src/javax/inject/Qualifier.java | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/javax/inject/Qualifier.java b/src/javax/inject/Qualifier.java new file mode 100644 index 0000000..6b4c42d --- /dev/null +++ b/src/javax/inject/Qualifier.java @@ -0,0 +1,58 @@ +/* + * Copyright (C) 2009 The JSR-330 Expert Group + * + * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 + * + * 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. + */ + +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: + * + * <ul> + * <li>is annotated with {@code @Qualifier}, {@code @Retention(RUNTIME)}, + * and typically {@code @Documented}.</li> + * <li>can have attributes.</li> + * <li>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.</li> + * <li>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).</li> + * </ul> + * + * <p>For example: + * + * <pre> + * @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 } + * }</pre> + * + * @see javax.inject.Named @Named + */ +@Target(ANNOTATION_TYPE) +@Retention(RUNTIME) +@Documented +public @interface Qualifier {} |