//
   //  ========================================================================
   //  Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.start;
  
  import java.io.Closeable;
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.FileSystems;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.attribute.FileTime;
  import java.util.Locale;
  
  public class FS
  {
      public static boolean canReadDirectory(Path path)
      {
          return Files.exists(path) && Files.isDirectory(path) && Files.isReadable(path);
      }
  
      public static boolean canReadFile(Path path)
      {
          return Files.exists(path) && Files.isRegularFile(path) && Files.isReadable(path);
      }
  
      public static boolean canWrite(Path path)
      {
          return Files.isWritable(path);
      }
  
      public static void close(Closeable c)
      {
          if (c == null)
          {
              return;
          }
  
          try
          {
              c.close();
          }
          catch (IOException ignore)
          {
              /* ignore */
          }
      }
  
      public static boolean createNewFile(Path path) throws IOException
      {
          Path ret = Files.createFile(path);
          return Files.exists(ret);
      }
  
      public static void ensureDirectoryExists(Path dir) throws IOException
      {
          if (exists(dir))
          {
              // exists already, nothing to do
              return;
          }
          Files.createDirectories(dir);
      }
  
      public static void ensureDirectoryWritable(Path dir) throws IOException
      {
          if (!Files.exists(dir))
          {
              throw new IOException("Path does not exist: " + dir.toAbsolutePath());
          }
          if (!Files.isDirectory(dir))
          {
              throw new IOException("Directory does not exist: " + dir.toAbsolutePath());
          }
          if (!Files.isWritable(dir))
          {
              throw new IOException("Unable to write to directory: " + dir.toAbsolutePath());
          }
      }
  
      public static boolean exists(Path path)
      {
          return Files.exists(path);
      }
 
     public static boolean isValidDirectory(Path path)
     {
         if (!Files.exists(path))
         {
             // doesn't exist, not a valid directory
             return false;
         }
 
         if (!Files.isDirectory(path))
         {
             // not a directory (as expected)
             StartLog.warn("Not a directory: " + path);
             return false;
         }
 
         return true;
     }
 
     public static boolean isXml(String filename)
     {
         return filename.toLowerCase(Locale.ENGLISH).endsWith(".xml");
     }
     
     public static String toRelativePath(File baseDir, File path)
     {
         return baseDir.toURI().relativize(path.toURI()).toASCIIString();
     }
     
     public static boolean isPropertyFile(String filename)
     {
         return filename.toLowerCase(Locale.ENGLISH).endsWith(".properties");
     }
     
     public static String separators(String path)
     {
         StringBuilder ret = new StringBuilder();
         for (char c : path.toCharArray())
         {
             if ((c == '/') || (c == '\\'))
             {
                 ret.append(File.separatorChar);
             }
             else
             {
                 ret.append(c);
             }
         }
         return ret.toString();
     }
 
     public static Path toPath(String path)
     {
         return FileSystems.getDefault().getPath(FS.separators(path));
     }
 
     public static void touch(Path path) throws IOException
     {
         FileTime now = FileTime.fromMillis(System.currentTimeMillis());
         Files.setLastModifiedTime(path,now);
     }
 
     public static Path toRealPath(Path path) throws IOException
     {
         return path.toRealPath();
     }
 }