001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017
018package org.apache.logging.log4j.core.config.plugins;
019
020import java.lang.annotation.Annotation;
021import java.lang.annotation.Documented;
022import java.lang.annotation.ElementType;
023import java.lang.annotation.Retention;
024import java.lang.annotation.RetentionPolicy;
025import java.lang.annotation.Target;
026
027import org.apache.logging.log4j.core.config.plugins.visitors.PluginVisitor;
028
029/**
030 * Meta-annotation to denote the class name to use that implements
031 * {@link org.apache.logging.log4j.core.config.plugins.visitors.PluginVisitor} for the annotated annotation.
032 */
033@Documented
034@Retention(RetentionPolicy.RUNTIME)
035@Target(ElementType.ANNOTATION_TYPE)
036public @interface PluginVisitorStrategy {
037
038    /**
039     * The class to use that implements {@link org.apache.logging.log4j.core.config.plugins.visitors.PluginVisitor}
040     * for the given annotation. The generic type in {@code PluginVisitor} should match the annotation this annotation
041     * is applied to.
042     */
043    Class<? extends PluginVisitor<? extends Annotation>> value();
044}