FileUtil.java

package proj.zoie.api.impl.util;

/**
 * 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.
 */
import java.io.File;
import java.io.IOException;

public class FileUtil {
  /**
     * utility method to delete a directory
     * @param dir
     * @throws IOException
     */
  private static void deleteDir(File dir) {
    if (dir == null) return;

    if (dir.isDirectory()) {
      File[] files = dir.listFiles();
      for (File file : files) {
        deleteDir(file);
      }
      dir.delete();
    } else {
      dir.delete();
    }
  }

  /**
   * Purges an index
   */
  public static void rmDir(File location) {
    String name = location.getName() + "-" + System.currentTimeMillis();
    File parent = location.getParentFile();
    File tobeDeleted = new File(parent, name);
    location.renameTo(tobeDeleted);
    // try to delete the files, ok if it fails, this is just for testing
    deleteDir(tobeDeleted);
  }

  public static long sizeFile(File location) {
    if (location == null || !location.exists()) return 0;
    long total = 0;
    if (location.isDirectory()) {
      File[] files = location.listFiles();
      for (File file : files) {
        total += sizeFile(file);
      }
      return total;
    } else {
      return location.length();
    }
  }
}