    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
    015    package org.apache.tapestry5.annotations;
    016
    017
    018    import java.lang.annotation.Documented;
    019    import static java.lang.annotation.ElementType.FIELD;
    020    import static java.lang.annotation.ElementType.PARAMETER;
    021    import java.lang.annotation.Retention;
    022    import static java.lang.annotation.RetentionPolicy.RUNTIME;
    023    import java.lang.annotation.Target;
    024
    025    import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.*;
    026
    027    import org.apache.tapestry5.ioc.annotations.Inject;
    028    import 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})
    040    public @interface Service
    041    {
    042        /**
    043         * The name of the service. Symbols will be expanded and case is not relevant.
    044         */
    045        String value();
    046    }