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.validation.constraints; 018 019import org.apache.logging.log4j.core.config.plugins.validation.Constraint; 020import org.apache.logging.log4j.core.config.plugins.validation.validators.ValidHostValidator; 021 022import java.lang.annotation.*; 023import java.net.InetAddress; 024 025/** 026 * Indicates that a plugin attribute must be a valid host. This relies on the same validation rules as 027 * {@link InetAddress#getByName(String)}. 028 * 029 * @since 2.8 030 */ 031@Documented 032@Retention(RetentionPolicy.RUNTIME) 033@Target({ElementType.FIELD, ElementType.PARAMETER}) 034@Constraint(ValidHostValidator.class) 035public @interface ValidHost { 036 037 /** 038 * The message to be logged if this constraint is violated. This should normally be overridden. 039 */ 040 String message() default "The hostname is invalid"; 041}