Java tutorial
/* * Copyright 2015 JAXIO http://www.jaxio.com * * 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.jaxio.celerio.configuration.validation; import org.apache.commons.lang.StringUtils; import javax.validation.ConstraintValidator; import javax.validation.ConstraintValidatorContext; public class WordValidator implements ConstraintValidator<Word, String> { boolean allowEmpty; @Override public void initialize(Word constraintAnnotation) { allowEmpty = constraintAnnotation.allowEmpty(); } @Override public boolean isValid(String value, ConstraintValidatorContext context) { return !(!allowEmpty && (value == null || StringUtils.isEmpty(value))); } }