/*
    * Copyright 2001-2005 The Apache Software Foundation.
    *
    * 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 org.apache.logging.log4j.catalog.jpa.service;
  
  import java.util.Locale;
  
  import org.springframework.data.domain.PageRequest;
  import org.springframework.data.domain.Pageable;
  import org.springframework.data.domain.Sort;
  
  public class AbstractPagingAndSortingService {
  
      protected Pageable createPageRequest(int startPage, int itemsPerPage, String sortColumn, String direction) {
          PageRequest pageRequest;
          if (sortColumn == null || sortColumn.length() == 0) {
              pageRequest = new PageRequest(startPage, itemsPerPage);
          } else {
              Sort.Direction sortDirection;
              if (direction == null) {
                  sortDirection = Sort.Direction.ASC;
              } else {
                  sortDirection = Sort.Direction.fromStringOrNull(direction.toUpperCase(Locale.US));
                  if (sortDirection == null) {
                      sortDirection = Sort.Direction.ASC;
                  }
              }
              pageRequest = new PageRequest(startPage, itemsPerPage, new Sort(sortDirection, sortColumn));
          }
          return pageRequest;
      }
  }