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 }