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;
018
019import java.lang.annotation.Annotation;
020
021/**
022 * Interface that {@link Constraint} annotations must implement to perform validation logic.
023 *
024 * @param <A> the {@link Constraint} annotation this interface validates.
025 * @since 2.1
026 */
027public interface ConstraintValidator<A extends Annotation> {
028
029    /**
030     * Called before this validator is used with the constraint annotation value.
031     *
032     * @param annotation the annotation value this validator will be validating.
033     */
034    void initialize(A annotation);
035
036    /**
037     * Indicates if the given value is valid.
038     *
039     * @param value the value to validate.
040     * @return {@code true} if the given value is valid.
041     */
042    boolean isValid(Object value);
043}