1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache license, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the license for the specific language governing permissions and
15 * limitations under the license.
16 */
17 package org.apache.logging.log4j.core.config.plugins.validation.constraints;
18
19 import org.apache.logging.log4j.core.config.plugins.validation.Constraint;
20 import org.apache.logging.log4j.core.config.plugins.validation.validators.ValidHostValidator;
21
22 import java.lang.annotation.*;
23 import java.net.InetAddress;
24
25 /**
26 * Indicates that a plugin attribute must be a valid host. This relies on the same validation rules as
27 * {@link InetAddress#getByName(String)}.
28 *
29 * @since 2.8
30 */
31 @Documented
32 @Retention(RetentionPolicy.RUNTIME)
33 @Target({ElementType.FIELD, ElementType.PARAMETER})
34 @Constraint(ValidHostValidator.class)
35 public @interface ValidHost {
36
37 /**
38 * The message to be logged if this constraint is violated. This should normally be overridden.
39 */
40 String message() default "The hostname is invalid";
41 }