| /* |
| * Copyright (c) 2009, Rickard Öberg. All Rights Reserved. |
| * |
| * 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 org.apache.zest.api.service.qualifier; |
| |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import org.apache.zest.api.service.ServiceReference; |
| import org.apache.zest.functional.Specification; |
| |
| /** |
| * Filter services based on tags. Tags can be set using the ServiceTags meta-info, like so: |
| * <pre><code> |
| * module.addService(MyService.class).taggedWith(new ServiceTags("onetag","twotag")); |
| * </code></pre> |
| * |
| * and then at an injection point you can do this: |
| * |
| * <pre><code> |
| * @Service @Tagged("onetag") MyService service; |
| * </code></pre> |
| * to get only a service tagged with MyService. If several match only the first match is used. |
| */ |
| @Retention( RetentionPolicy.RUNTIME ) |
| @Qualifier( Tagged.TaggedQualifier.class ) |
| public @interface Tagged |
| { |
| public abstract String[] value(); |
| |
| /** |
| * Tagged Annotation Qualifier. |
| * See {@link Tagged}. |
| */ |
| public final class TaggedQualifier |
| implements AnnotationQualifier<Tagged> |
| { |
| @Override |
| public Specification<ServiceReference<?>> qualifier( Tagged tagged ) |
| { |
| return ServiceQualifier.withTags( tagged.value() ); |
| } |
| } |
| } |