Examples of org.terrier.utility.io.FileSystem

org.terrier.utility.io.FileSystem
This is the Terrier File Abstraction Layer interface depicting the operations available for a file system. @since 2.1 @author Craig Macdonald


  /** What is the parent path to the specified path? */
  public static String getParent(String path)
  {
    path = transform(path);
        final FileSystem fs = getFileSystem(path);
        if (fs == null)
            return null;
        if ((fs.capabilities() & FSCapability.STAT) == 0)
            return null;
        try{
            return fs.getParent(path);
        } catch (IOException ioe) {
            return null;
        }  
  }

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  private static final String[] EMPTY_STRING_ARRAY = new String[0];
  /** List the contents of a directory */
  public static String[] list(String path)
  {
    path = transform(path);
        final FileSystem fs = getFileSystem(path);
        if (fs == null)
            return EMPTY_STRING_ARRAY;
        if ((fs.capabilities() & FSCapability.LS_DIR) == 0)
            return EMPTY_STRING_ARRAY;
        try{
            return fs.list(path);
        } catch (IOException ioe) {
            return EMPTY_STRING_ARRAY;
        }


  }

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      return fileSystems.get(DEFAULT_SCHEME);
    //identify scheme component of filename
    final int colonPos = filename.indexOf(":"); 
    final String scheme = filename.substring(0, colonPos).toLowerCase();
    //obtain the filesystem representing the scheme
    FileSystem rtr = fileSystems.get(scheme);
    //if (rtr ==  null)
    //{  
      //throw new RuntimeException("FileSystem for "+filename +"(scheme '"+scheme+"') not found. Configured schemes are: "
      //    + ArrayUtils.join(fileSystems.keySet().toArray(new String[0]), ", "));
    //}

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    * @return name Name of the file system, or null if no filesystem found
    */
  public static String getFileSystemName(String path) 
  {
    path = transform(path);
    final FileSystem fs = getFileSystem(path);
    if (fs == null)
      return null;
    return fs.name();
  }

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   * @throws IOException
   */
  protected static InputStream openFile(String filename) throws IOException
  {
    filename = transform(filename);
    final FileSystem fs = getFileSystem(filename);
    if (fs == null)
      throw new FileNotFoundException("No file system for "+filename);
    if ((fs.capabilities() & FSCapability.READ) == 0)
      throw new IOException("File system not supporting reads for "+ filename);
        
    InputStream rtr = fs.openFileStream(filename);
    for(Pattern regex : inputStreamMap.keySet())
    {
      if (regex.matcher(filename).matches())
      {
        Class<? extends InputStream> filterClass = inputStreamMap.get(regex);

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   * @throws IOException
   */
  protected static OutputStream writeFile(String filename) throws IOException
  {
    filename = transform(filename);
    final FileSystem fs = getFileSystem(filename);
    if (fs == null)
      throw new FileNotFoundException("No file system for "+filename);
    if ((fs.capabilities() & FSCapability.WRITE) == 0)
      throw new IOException("File system not supporting writes for "+ filename);
    OutputStream rtr = fs.writeFileStream(filename);
    for(Pattern regex : outputStreamMap.keySet())
    {
      if (regex.matcher(filename).matches())
      {
        Class<? extends OutputStream> filterClass = outputStreamMap.get(regex);

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  /** Returns a RandomAccessFile implementation accessing the specificed file */
  public static RandomDataInput openFileRandom(String filename) throws IOException
  {
    filename = transform(filename);
    final FileSystem fs = getFileSystem(filename);
    if (fs == null)
      throw new FileNotFoundException("No file system for "+filename);
    if ((fs.capabilities() & FSCapability.RANDOM_READ) == 0)
      throw new IOException("File system not supporting random reads for "+ filename);
    return fs.openFileRandom(filename);
  }

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org.terrier.utility.Files

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