Java tutorial
/* * Copyright 2018 Tigran Dadaiants * * 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.github.tddts.jet.config.spring.postprocessor; import com.github.tddts.jet.config.spring.annotations.LoadContent; import com.github.tddts.jet.util.SpringUtil; import com.github.tddts.jet.util.Util; import org.apache.commons.lang3.tuple.Pair; import org.springframework.beans.BeansException; import org.springframework.beans.factory.BeanInitializationException; import org.springframework.beans.factory.config.BeanPostProcessor; import org.springframework.util.StringUtils; import javax.annotation.Resource; import java.lang.reflect.Field; import java.util.Properties; /** * {@code LoadContentAnnotationBeanPostProcessor} is a {@link BeanPostProcessor} that inserts content of files into * fields marked by {@link LoadContent} annotation presenting in processed beans. * * @author Tigran_Dadaiants dtkcommon@gmail.com */ public class LoadContentAnnotationBeanPostProcessor implements BeanPostProcessor { @Resource private Properties applicationProperties; @Override public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { Pair<Class<?>, Object> typeObjectPair = SpringUtil.checkForDinamicProxy(bean); Class<?> type = typeObjectPair.getLeft(); Object target = typeObjectPair.getRight(); try { for (Field field : type.getDeclaredFields()) { if (field.isAnnotationPresent(LoadContent.class) && String.class.equals(field.getType())) { field.setAccessible(true); String fileName = getFileName(target, field); if (!StringUtils.isEmpty(fileName)) { field.set(target, Util.loadContent(fileName)); } } } } catch (Exception e) { throw new BeanInitializationException(e.getMessage(), e); } return bean; } private String getFileName(Object target, Field field) throws IllegalAccessException { LoadContent annotation = field.getAnnotation(LoadContent.class); if (annotation.value().isEmpty()) { return (String) field.get(target); } if (annotation.property()) { return applicationProperties.getProperty(annotation.value()); } else { return annotation.value(); } } @Override public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { return bean; } }