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 */ 017package org.apache.logging.log4j.core.config.plugins; 018 019import java.lang.annotation.Documented; 020import java.lang.annotation.ElementType; 021import java.lang.annotation.Retention; 022import java.lang.annotation.RetentionPolicy; 023import java.lang.annotation.Target; 024 025import org.apache.logging.log4j.core.config.plugins.visitors.PluginValueVisitor; 026 027/** 028 * Identifies a parameter as a value. These correspond with property values generally, but are meant as values to be 029 * used as a placeholder value somewhere. 030 * 031 * @see org.apache.logging.log4j.core.config.PropertiesPlugin 032 */ 033@Documented 034@Retention(RetentionPolicy.RUNTIME) 035@Target({ElementType.PARAMETER, ElementType.FIELD}) 036@PluginVisitorStrategy(PluginValueVisitor.class) 037public @interface PluginValue { 038 039 String value(); 040}