001// Copyright 2007, 2009, 2011 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.annotations;
016
017
018import java.lang.annotation.Documented;
019import static java.lang.annotation.ElementType.FIELD;
020import static java.lang.annotation.ElementType.PARAMETER;
021import java.lang.annotation.Retention;
022import static java.lang.annotation.RetentionPolicy.RUNTIME;
023import java.lang.annotation.Target;
024
025import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.*;
026
027import org.apache.tapestry5.ioc.annotations.Inject;
028import org.apache.tapestry5.ioc.annotations.UseWith;
029
030/**
031 * Used in conjunction with the {@link Inject} annotation to identify a service <em>by name</em> and not by type. This
032 * is most useful when there are multiple services with the same service interface and a particular one needs to be
033 * selected.
034 */
035@Target(
036        { FIELD, PARAMETER })
037@Documented
038@Retention(RUNTIME)
039@UseWith({COMPONENT,MIXIN,PAGE,SERVICE})
040public @interface Service
041{
042    /**
043     * The name of the service. Symbols will be expanded and case is not relevant.
044     */
045    String value();
046}