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;
18
19 import java.lang.annotation.Annotation;
20 import java.lang.annotation.Documented;
21 import java.lang.annotation.ElementType;
22 import java.lang.annotation.Retention;
23 import java.lang.annotation.RetentionPolicy;
24 import java.lang.annotation.Target;
25
26 /**
27 * Meta annotation to mark an annotation as a validation constraint. This annotation must specify a
28 * {@link ConstraintValidator} implementation class that has a default constructor.
29 *
30 * @since 2.1
31 */
32 @Documented
33 @Target(ElementType.ANNOTATION_TYPE)
34 @Retention(RetentionPolicy.RUNTIME)
35 public @interface Constraint {
36
37 /**
38 * {@link ConstraintValidator} class that implements the validation logic for the annotated constraint annotation.
39 */
40 Class<? extends ConstraintValidator<? extends Annotation>> value();
41 }