001// Copyright 2007 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.tapestry5.internal.services; 016 017import org.apache.tapestry5.annotations.Service; 018import org.apache.tapestry5.commons.AnnotationProvider; 019import org.apache.tapestry5.commons.ObjectLocator; 020import org.apache.tapestry5.commons.ObjectProvider; 021 022/** 023 * Adds support for the {@link Service} annotation (which can be applied to fields or parameters), which is used to 024 * disambiguate injection when multiple services implement the same service interface. 025 */ 026public class ServiceAnnotationObjectProvider implements ObjectProvider 027{ 028 public <T> T provide(Class<T> objectType, AnnotationProvider annotationProvider, 029 ObjectLocator locator) 030 { 031 Service annotation = annotationProvider.getAnnotation(Service.class); 032 033 if (annotation == null) return null; 034 035 return locator.getService(annotation.value(), objectType); 036 } 037 038}