Java tutorial
/* * Copyright 2019 ThoughtWorks, Inc. * * Licensed 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 com.thoughtworks.go.validation; import com.thoughtworks.go.domain.materials.ValidationBean; import org.apache.commons.lang3.StringUtils; public class EmailValidator extends Validator<String> { public static final String EMAIL_ERROR_MESSAGE = "Invalid email address."; public EmailValidator() { super(EMAIL_ERROR_MESSAGE); } public ValidationBean validate(String address) { if (StringUtils.isBlank(address)) { return ValidationBean.valid(); } if (address.matches(".*@" + HostnameValidator.HOSTNAME_PATTERN)) { return ValidationBean.valid(); } return ValidationBean.notValid(EMAIL_ERROR_MESSAGE); } }