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Statistical sampling library for use in virtdata libraries, based
on apache commons math 4
/*
* 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.core.config.plugins.validation.validators;
import java.util.Collection;
import java.util.Map;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.config.plugins.validation.ConstraintValidator;
import org.apache.logging.log4j.core.config.plugins.validation.constraints.Required;
import org.apache.logging.log4j.core.util.Assert;
import org.apache.logging.log4j.status.StatusLogger;
/**
* Validator that checks an object for emptiness. Emptiness is defined here as:
*
* - The value {@code null}
* - An object of type {@link CharSequence} with length 0
* - An empty array
* - An empty {@link Collection}
* - An empty {@link Map}
*
*
* @since 2.1
*/
public class RequiredValidator implements ConstraintValidator {
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;
}
}