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