code: /*******************************************************************************
   * Copyright 2018 572682
   * 
   * 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 us.dot.its.jpo.ode.importer;
  
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.nio.file.StandardCopyOption;
  
  /**
   * Contains file and directory manipulation code
   */
  public class OdeFileUtils {
  
     private OdeFileUtils() {
     }
  
     /**
      * Attempts to create a directory given a String path.
      * 
      * @param dir
      * @throws IOException
      */
     public static void createDirectoryRecursively(Path dir) throws IOException {
  
        // Attempt to create a directory
        try {
           Files.createDirectories(dir);
        } catch (IOException e) {
           throw new IOException("Exception while trying to create directory: " + e);
        }
  
        // Verify the directory was successfully created
        if (!dir.toFile().exists()) {
           throw new IOException("Failed to verify directory creation - directory does not exist.");
        }
  
     }
  
     /**
      * Attempts to move a file to a backup directory. Prepends the filename with
      * the current time and changes the file extension to 'pbo'.
      * 
      * @param file
      *           Path of the file being moved
      * @param backup
      *           Path of backup directory
      * @throws IOException
      */
     public static void backupFile(Path file, Path backupDir) throws IOException {
  
        // Check that the destination directory actually exists before moving the
        // file
        if (!backupDir.toFile().exists()) {
           throw new IOException("Backup directory does not exist: " + backupDir);
        }
  
        // Prepend file name with time and change extension to 'pbo'
        String processedFileName = Integer.toString((int) System.currentTimeMillis()) + "-"
              + file.getFileName().toString().replaceFirst("uper", "pbo");
        Path targetPath = Paths.get(backupDir.toString(), processedFileName);
  
        // Attempt to move the file to the backup directory
        try {
           Files.move(file, targetPath, StandardCopyOption.REPLACE_EXISTING);
        } catch (IOException e) {
           throw new IOException("Unable to move file to backup: " + e);
        }
     }
     
     /**
      * Attempts to move and overwrite a file to destination directory. Throws exception if directory doesn't exist or move failed.
      * @param file
      * @param destination
      * @throws IOException 
      */
     public static void moveFile(Path file, Path destination) throws IOException {
     // Check that the destination directory actually exists before moving the
        // file
        if (!destination.toFile().exists()) {
           throw new IOException("Directory does not exist: " + destination);
        }
  
        Path targetPath = Paths.get(destination.toString(), file.getFileName().toString());
  
        // Attempt to move the file to the backup directory
        try {
           Files.move(file, targetPath, StandardCopyOption.REPLACE_EXISTING);
        } catch (IOException e) {
           throw new IOException("Unable to move file to backup: " + e);
        }
     }
  }
  