/*
    * Copyright 2017 LINE Corporation
    *
    * LINE Corporation 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 com.linecorp.centraldogma.internal;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.FileVisitResult;
  import java.nio.file.FileVisitor;
  import java.nio.file.Path;
  import java.nio.file.SimpleFileVisitor;
  import java.nio.file.attribute.BasicFileAttributes;
  
  final class DeletingFileVisitor extends SimpleFileVisitor<Path> {
  
      static final FileVisitor<Path> INSTANCE = new DeletingFileVisitor();
  
      @Override
      public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
          delete(file);
          return FileVisitResult.CONTINUE;
      }
  
      @Override
      public FileVisitResult visitFileFailed(Path file, IOException exc) {
          delete(file);
          return FileVisitResult.CONTINUE;
      }
  
      @Override
      public FileVisitResult postVisitDirectory(Path dir, IOException e) throws IOException {
          delete(dir);
  
          if (e == null) {
              return FileVisitResult.CONTINUE;
          } else {
              throw e;
          }
      }
  
      @SuppressWarnings("ResultOfMethodCallIgnored") // Best effort only
      private static void delete(Path p) {
          final File f = p.toFile();
          f.delete();
          f.setWritable(true, true);
      }
  }