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.solr.common.util;
  
  import java.io.*;
  import java.nio.channels.FileChannel;
  
  /**
   * @version $Id: FileUtils.java 1128254 2011-05-27 10:50:55Z mikemccand $
   */
  public class FileUtils {
  
    /**
     * Resolves a path relative a base directory.
     *
     * <p>
     * This method does what "new File(base,path)" <b>Should</b> do, it wasn't
     * completely lame: If path is absolute, then a File for that path is returned;
     * if it's not absoluve, then a File is returnd using "path" as a child 
     * of "base")
     * </p>
     */
    public static File resolvePath(File base, String path) {
      File r = new File(path);
      return r.isAbsolute() ? r : new File(base, path);
    }
  
    public static void copyFile(File src , File destination) throws IOException {
      FileChannel in = null;
      FileChannel out = null;
      try {
        in = new FileInputStream(src).getChannel();
        out = new FileOutputStream(destination).getChannel();
        in.transferTo(0, in.size(), out);
      } finally {
        try { if (in != null) in.close(); } catch (IOException e) {}
        try { if (out != null) out.close(); } catch (IOException e) {}
      }
    }
  
    /**
     * Copied from Lucene's FSDirectory.fsync(String) <!-- protected -->
     *
     * @param fullFile the File to be synced to disk
     * @throws IOException if the file could not be synced
     */
    public static void sync(File fullFile) throws IOException  {
      if (fullFile == null || !fullFile.exists())
        throw new FileNotFoundException("File does not exist " + fullFile);
  
      boolean success = false;
      int retryCount = 0;
      IOException exc = null;
      while(!success && retryCount < 5) {
        retryCount++;
        RandomAccessFile file = null;
        try {
          try {
            file = new RandomAccessFile(fullFile, "rw");
            file.getFD().sync();
            success = true;
          } finally {
            if (file != null)
              file.close();
          }
        } catch (IOException ioe) {
          if (exc == null)
            exc = ioe;
          try {
            // Pause 5 msec
            Thread.sleep(5);
          } catch (InterruptedException ie) {
            Thread.currentThread().interrupt();
          }
        }
      }
      if (!success)
        // Throw original exception
        throw exc;
    }
  
  }
  