package com.moral.api.util;
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import com.moral.anno.FieldName;
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import com.moral.pojo.CompareFieldResult;
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import lombok.extern.slf4j.Slf4j;
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import java.beans.IntrospectionException;
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import java.beans.PropertyDescriptor;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* @ClassName ComparePropertyUtils
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* @Description TODO
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* @Author 陈凯裕
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* @Date 2021/8/24 13:34
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* @Version TODO
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**/
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@Slf4j
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public class CompareFieldUtils {
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/**
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* @Description: 对比两个对象之间属性的区别
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* @Param: [t, oldObject, newObject]
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* @return: java.util.List<com.moral.pojo.CompareFieldResult>
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* @Author: 陈凯裕
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* @Date: 2021/8/24
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*/
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public static <T> List<CompareFieldResult> compare(T t, Object oldObject, Object newObject) {
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List<CompareFieldResult> results = new ArrayList<>();
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try {
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T oldObj = (T) oldObject;
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T newObj = (T) newObject;
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//获取class对象
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Class<?> TClass = oldObject.getClass();
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//获取类的属性
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Field[] fields = TClass.getDeclaredFields();
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for (Field field : fields) {
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//过滤序列化信息Id
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if ("serialVersionUID".equals(field.getName())) {
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continue;
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}
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//如果没有fieldName注解则跳过
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FieldName annotation = field.getAnnotation(FieldName.class);
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if(annotation==null)
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continue;
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//创建属性扫描器
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PropertyDescriptor pd = new PropertyDescriptor(field.getName(), TClass);
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//获取该属性的get方法
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Method readMethod = pd.getReadMethod();
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//读取对象该属性的值
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Object oldDataObj = readMethod.invoke(oldObj);
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Object newDataObj = readMethod.invoke(newObj);
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//如果新的值为null则证明该属性没有更新
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if(newDataObj==null)
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continue;
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//如果旧值和新值相等则证明没有改变
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if(oldDataObj!=null&&oldDataObj.toString().equals(newDataObj.toString()))
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continue;
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//创建返回对象
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CompareFieldResult result = new CompareFieldResult();
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result.setFieldName(field.getName());
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result.setFieldAnnoName(annotation.value());
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if(newDataObj.equals(""))
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result.setNewData("null");
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else
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result.setNewData(newDataObj.toString());
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if(oldDataObj==null||oldDataObj.equals(""))
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result.setOldData("null");
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else
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result.setOldData(oldDataObj.toString());
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results.add(result);
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}
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}catch (IntrospectionException e) {
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log.error(e.getMessage());
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} catch (IllegalAccessException e) {
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log.error(e.getMessage());
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} catch (InvocationTargetException e) {
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log.error(e.getMessage());
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}
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return results;
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}
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/**
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* @Description: 将对比结果类转换为content
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* @Param: [results, content] content参数需要传入修改的基本描述。比如，修改了前台菜单，修改了后台角色
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* @return: java.lang.String
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* @Author: 陈凯裕
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* @Date: 2021/8/24
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*/
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public static String resultsConvertContent(List<CompareFieldResult> results,String content){
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StringBuilder contentReulst = new StringBuilder(content+";");
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for (CompareFieldResult result : results) {
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contentReulst.append(result.getFieldAnnoName()+"："+result.getOldData()+"->"+result.getNewData()+";");
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}
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return contentReulst.toString();
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}
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}
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