/*
 * Enhydra Java Application Server Project
 * 
 * The contents of this file are subject to the Enhydra Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License on
 * the Enhydra web site ( http://www.enhydra.org/ ).
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See 
 * the License for the specific terms governing rights and limitations
 * under the License.
 * 
 * The Initial Developer of the Enhydra Application Server is Lutris
 * Technologies, Inc. The Enhydra Application Server and portions created
 * by Lutris Technologies, Inc. are Copyright Lutris Technologies, Inc.
 * All Rights Reserved.
 * 
 * Contributor(s):
 * 
 * $Id: TmpDir.java,v 1.15 2005/06/13 09:26:06 draganr Exp $
 */





package	com.lutris.util;

import	java.io.*;

/**
 * Class for creating and manage a temporary directory.
 *
 * @version	$Revision: 1.15 $
 * @author	Mark Diekhans
 * @since	Jolt1.0
 */
class TmpDir {
  File dir;

  /**
   * Create a tmp directory.
   *
   * @param dirPath Path of directory to generate the temporary file in.
   * @param baseName Prefix name of the directory.
   * @exception java.io.IOException if unable to create the directory.
   */
  public TmpDir (String path,
                 String baseName)
      throws IOException {
    int dirNum = 0;

    /*
     * Generate a unique directory.
     */
    while (true) {
      dir = new File (path, baseName + "." + System.currentTimeMillis () +
                      "." + dirNum + ".tmp");
      if (dir.mkdirs ()) {
        break;
      }
      if (!dir.exists ()) {
        /*
         * Didn't fail because it already exists, must be an access error.
         */
        throw new IOException ("no permission to create directory " +
                                dir.getAbsolutePath ());
      }
      dirNum++;
      if (dirNum >= 25) {
        throw new IOException ("failed to create tmp directory named in the " +
                               "form \"" + dir.getAbsolutePath () +
                               "\" after " + dirNum + " trys");

      }
    }
  }

  /**
   * Get the File object describing the directory.
   *
   * @return Reference to the file object.
   */
  public File file () {
    return dir;
  }
  
  /**
   * Recursive delete files.
   */
  void recursiveDelete (File dirPath) {
    String [] ls = dirPath.list ();

    for (int idx = 0; idx < ls.length; idx++) {
      File file = new File (dirPath, ls [idx]);
      if (file.isDirectory ())
        recursiveDelete (file);
      file.delete ();
    }
  }


  /**
   * Delete the directory and its contents
   *
   * @exception java.io.IOException if unable to remove the directory.
   */
  public void delete ()
      throws IOException {
    recursiveDelete (dir);
    if (dir.exists ()) {
      throw new IOException ("Unable to delete directory hierarchy \"" +
                             dir.getAbsolutePath () + "\"");
    }
  }

  /**
   * Create the specified directory in the tmp directory if it doesn't exist.
   *
   * @param path Path of directory relative to the tmp directory.
   * @return A File naming the new directory.
   * @exception java.io.IOException if unable to create the directory.
   */
  public File mkdirs (String path)
      throws IOException {
    File newDir = new File (dir.getAbsolutePath (), path);
    newDir.mkdirs ();
    if (!newDir.exists ()) {
      throw new IOException ("Unable to create directory \"" +
                             dir.getAbsolutePath () + "\"");
    }
    return newDir;
  }
}