Java tutorial
/** * 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.metron.common.field.validation.network; import org.apache.commons.validator.routines.DomainValidator; import org.apache.metron.common.dsl.Predicate2StellarFunction; import org.apache.metron.common.dsl.Stellar; import org.apache.metron.common.field.validation.FieldValidation; import org.apache.metron.common.field.validation.SimpleValidation; import java.util.Map; import java.util.function.Predicate; public class DomainValidation extends SimpleValidation { @Stellar(name = "IS_DOMAIN", description = "Tests if a string refers to a valid domain name. Domain names are evaluated according" + " to the standards RFC1034 section 3, and RFC1123 section 2.1.", params = { "address - The string to test" }, returns = "True if the string refers to a valid domain name and false if otherwise") public static class IS_DOMAIN extends Predicate2StellarFunction { public IS_DOMAIN() { super(new DomainValidation()); } } @Override public Predicate<Object> getPredicate() { return domain -> DomainValidator.getInstance().isValid(domain == null ? null : domain.toString()); } }