content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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
   *
   *    https://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 org.apache.bigtop.manager.server.model.vo;
  
  import org.apache.bigtop.manager.server.exception.ServerException;
  
  import org.mapstruct.factory.Mappers;
  
  import com.github.pagehelper.PageInfo;
  import lombok.Data;
  
  import java.lang.reflect.Method;
  import java.util.ArrayList;
  import java.util.List;
  
  @Data
  public class PageVO<T> {
  
      private Long total;
  
      private List<T> content;
  
      public static <T> PageVO<T> of(List<T> content, Long total) {
          PageVO<T> res = new PageVO<>();
          res.setContent(content);
          res.setTotal(total);
          return res;
      }
  
      @SuppressWarnings("unchecked")
      public static <T, S> PageVO<T> of(PageInfo<S> page) {
          List<T> content = new ArrayList<>();
          if (page.hasContent()) {
              try {
                  Class<S> clz = (Class<S>) page.getList().get(0).getClass();
                  String className = "org.apache.bigtop.manager.server.model.converter."
                          + clz.getSimpleName().replace("PO", "") + "Converter";
                  Class<?> mapper = Class.forName(className);
                  Object o = Mappers.getMapper(mapper);
                  Method method = o.getClass().getDeclaredMethod("fromPO2VO", List.class);
                  content = (List<T>) method.invoke(o, page.getList());
              } catch (Exception e) {
                  throw new ServerException(e);
              }
          }
  
          PageVO<T> res = new PageVO<>();
          res.setContent(content);
          res.setTotal(page.getTotal());
          return res;
      }
  }
  