copy object instantiate object

/**

• @author : lssffy

• @Description : copy object

• @date : 2023/5/29 10:33
  */
  @Slf4j
  public class BeanCopy {

  public static T copy(Object source, Class target) {
  if(target == null){
  return null;
  }
  try {
  T t = target.newInstance();
  return copy(source,t);
  }catch (Exception e){
  log.error(“Failed to copy:{}” , e);
  throw new BusinessException(CommonErrors.COPY_OBJ_FAIL,e);
  }
  }

  public static T copy(Object source, T target){
  if(target == null || source == null){
  return null;
  }
  BeanCopier copier = BeanCopier.create(source.getClass(), target.getClass(),true);
  copier.copy(source, target, new Converter() {
  @Override
  public Object convert(Object obj, Class cls, Object context) {
  if(obj == null){
  return null;
  }
  /**
  * source is String，target is Date
  /
  else if((obj instanceof String) && Date.class.isAssignableFrom(cls)){
  return DateUtils.parseDate((String) obj);
  }
  /*
  * source is Date, target is String
  /
  else if((obj instanceof Date) && String.class.isAssignableFrom(cls)){
  return DateFormatUtils.format((Date) obj);
  }
  /*
  * source is not String, target is String
  /
  else if(!(obj instanceof String) && String.class.isAssignableFrom(cls)) {
  return String.valueOf(obj);
  }
  /*
  * different custom objects, but with the same fields name
  */
  else if(cls.toString().contains(“com.example”) && !cls.equals(obj.getClass())){
  return copy(obj, cls);
  }
  return obj;
  }
  });
  return target;
  }

  /**

  • if source、target is element to list,but both is object is not same as type。
  • @param source
  • @param target
  • @param properties
    */
    public static void copyProperties(Object source,Object target,String… properties){
    BeanUtils.copyProperties(source,target,properties);
    }

  public static T copyProperties(Object source,Class cls,String… properties){
  T target;
  try {
  target = cls.newInstance();
  } catch (Exception e){
  log.error(“Cannot copy properties:{}”, e);
  throw new BusinessException(CommonErrors.INSTANCE_OBJ_FAIL,e);
  }
  return target;
  }

  public static List copyList(List<?> source, Class cls){
  if(source == null){
  return null;
  }
  return source.stream().map(s->copy(s,cls)).collect(Collectors.toList());
  }
  }