text: /*
   *  Copyright Beijing 58 Information Technology Co.,Ltd.
   *
   *  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
   *
   *        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.bj58.spat.gaea.serializer.component.helper;
  
  import java.io.File;
  import java.util.List;
  import java.util.ArrayList;
  
  /**
   * FileHelper
   * 
   * @author Service Platform Architecture Team (spat@58.com)
   */
  public class FileHelper {
  
      public static List<File> getFiles(String dir, String... extension) {
          File f = new File(dir);
          if (!f.isDirectory()) {
              return null;
          }
  
          List<File> fileList = new ArrayList<File>();
          getFiles(f, fileList, extension);
  
          return fileList;
      }
  
      private static void getFiles(File f, List<File> fileList, String... extension) {
          File[] files = f.listFiles();
          if(files==null){
              return;
          }
          for (int i = 0; i < files.length; i++) {
              if (files[i].isDirectory()) {
                  getFiles(files[i], fileList, extension);
              } else if (files[i].isFile()) {
                  String fileName = files[i].getName().toLowerCase();
                  boolean isAdd = false;
                  if (extension != null) {
                      for (String ext : extension) {
                          if (fileName.lastIndexOf(ext) == fileName.length() - ext.length()) {
                              isAdd = true;
                              break;
                          }
                      }
                  }
                  if (isAdd) {
                      fileList.add(files[i]);
                  }
              }
          }
      }
  }
  