| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache license, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the license for the specific language governing permissions and |
| * limitations under the license. |
| */ |
| package org.apache.logging.log4j.plugins.validation.validators; |
| |
| import org.apache.logging.log4j.Logger; |
| import org.apache.logging.log4j.plugins.validation.ConstraintValidator; |
| import org.apache.logging.log4j.plugins.validation.constraints.Required; |
| import org.apache.logging.log4j.util.Assert; |
| import org.apache.logging.log4j.status.StatusLogger; |
| |
| import java.util.Collection; |
| import java.util.Map; |
| |
| /** |
| * Validator that checks an object for emptiness. Emptiness is defined here as: |
| * <ul> |
| * <li>The value {@code null}</li> |
| * <li>An object of type {@link CharSequence} with length 0</li> |
| * <li>An empty array</li> |
| * <li>An empty {@link Collection}</li> |
| * <li>An empty {@link Map}</li> |
| * </ul> |
| * |
| * @since 2.1 |
| */ |
| public class RequiredValidator implements ConstraintValidator<Required> { |
| |
| private static final Logger LOGGER = StatusLogger.getLogger(); |
| |
| private Required annotation; |
| |
| @Override |
| public void initialize(final Required anAnnotation) { |
| this.annotation = anAnnotation; |
| } |
| |
| @Override |
| public boolean isValid(final String name, final Object value) { |
| return Assert.isNonEmpty(value) || err(name); |
| } |
| |
| private boolean err(final String name) { |
| LOGGER.error(annotation.message() + ": " + name); |
| return false; |
| } |
| } |