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
   *
   *     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.cassandra.utils;
  
  import java.io.IOException;
  import java.nio.file.FileVisitResult;
  import java.nio.file.Path;
  import java.nio.file.SimpleFileVisitor;
  import java.nio.file.attribute.BasicFileAttributes;
  
  /**
   * Walks directory recursively, summing up total contents of files within.
   */
  public class DirectorySizeCalculator extends SimpleFileVisitor<Path>
  {
      private volatile long size = 0;
  
      public DirectorySizeCalculator()
      {
          super();
      }
  
      public boolean isAcceptable(Path file)
      {
          return true;
      }
  
      @Override
      public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
      {
          if (isAcceptable(file))
              size += attrs.size();
          return FileVisitResult.CONTINUE;
      }
  
      @Override
      public FileVisitResult visitFileFailed(Path file, IOException exc)
      {
          return FileVisitResult.CONTINUE;
      }
  
      public long getAllocatedSize()
      {
          return size;
      }
  
      /**
       * Reset the size to 0 in case that the size calculator is used multiple times
       */
      public void resetSize()
      {
          size = 0;
      }
  }
  