    001// Copyright 2007, 2009 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
    017import org.apache.tapestry5.Block;
    018import org.apache.tapestry5.ioc.annotations.Inject;
    019import org.apache.tapestry5.ioc.annotations.UseWith;
    020import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.*;
    021
    022import java.lang.annotation.Documented;
    023import static java.lang.annotation.ElementType.FIELD;
    024import java.lang.annotation.Retention;
    025import static java.lang.annotation.RetentionPolicy.RUNTIME;
    026import java.lang.annotation.Target;
    027
    028/**
    029 * Optional annotation, used with {@link Inject}, which exists to provide the id of an object when it can not be
    030 * determined by other means (such as from the field name). Currently, this is used when injecting a {@link Block}.
    031 */
    032@Target(FIELD)
    033@Documented
    034@Retention(RUNTIME)
    035@UseWith({COMPONENT,MIXIN,PAGE,SERVICE})
    036public @interface Id
    037{
    038    /**
    039     * The id.
    040     */
    041    String value();
    042}