Ejemplo n.º 1
0
  /**
   * If <code>f</code> is a file, this method will make a single call to S3. If <code>f</code> is a
   * directory, this method will make a maximum of (<i>n</i> / 1000) + 2 calls to S3, where <i>n</i>
   * is the total number of files and directories contained directly in <code>f</code>.
   */
  @Override
  public FileStatus[] listStatus(Path f) throws IOException {

    Path absolutePath = makeAbsolute(f);
    String key = pathToKey(absolutePath);

    if (key.length() > 0) {
      FileMetadata meta = store.retrieveMetadata(key);
      if (meta != null) {
        return new FileStatus[] {newFile(meta, absolutePath)};
      }
    }

    URI pathUri = absolutePath.toUri();
    Set<FileStatus> status = new TreeSet<FileStatus>();
    String priorLastKey = null;
    do {
      PartialListing listing = store.list(key, S3_MAX_LISTING_LENGTH, priorLastKey, false);
      for (FileMetadata fileMetadata : listing.getFiles()) {
        Path subpath = keyToPath(fileMetadata.getKey());
        String relativePath = pathUri.relativize(subpath.toUri()).getPath();

        if (fileMetadata.getKey().equals(key + "/")) {
          // this is just the directory we have been asked to list
        } else if (relativePath.endsWith(FOLDER_SUFFIX)) {
          status.add(
              newDirectory(
                  new Path(
                      absolutePath,
                      relativePath.substring(0, relativePath.indexOf(FOLDER_SUFFIX)))));
        } else {
          status.add(newFile(fileMetadata, subpath));
        }
      }
      for (String commonPrefix : listing.getCommonPrefixes()) {
        Path subpath = keyToPath(commonPrefix);
        String relativePath = pathUri.relativize(subpath.toUri()).getPath();
        status.add(newDirectory(new Path(absolutePath, relativePath)));
      }
      priorLastKey = listing.getPriorLastKey();
    } while (priorLastKey != null);

    if (status.isEmpty()
        && key.length() > 0
        && store.retrieveMetadata(key + FOLDER_SUFFIX) == null) {
      throw new FileNotFoundException("File " + f + " does not exist.");
    }

    return status.toArray(new FileStatus[status.size()]);
  }
Ejemplo n.º 2
0
  @Override
  public FileStatus getFileStatus(Path f) throws IOException {
    Path absolutePath = makeAbsolute(f);
    String key = pathToKey(absolutePath);

    if (key.length() == 0) { // root always exists
      return newDirectory(absolutePath);
    }

    if (LOG.isDebugEnabled()) {
      LOG.debug("getFileStatus retrieving metadata for key '" + key + "'");
    }
    FileMetadata meta = store.retrieveMetadata(key);
    if (meta != null) {
      if (LOG.isDebugEnabled()) {
        LOG.debug("getFileStatus returning 'file' for key '" + key + "'");
      }
      return newFile(meta, absolutePath);
    }
    if (store.retrieveMetadata(key + FOLDER_SUFFIX) != null) {
      if (LOG.isDebugEnabled()) {
        LOG.debug(
            "getFileStatus returning 'directory' for key '"
                + key
                + "' as '"
                + key
                + FOLDER_SUFFIX
                + "' exists");
      }
      return newDirectory(absolutePath);
    }

    if (LOG.isDebugEnabled()) {
      LOG.debug("getFileStatus listing key '" + key + "'");
    }
    PartialListing listing = store.list(key, 1);
    if (listing.getFiles().length > 0 || listing.getCommonPrefixes().length > 0) {
      if (LOG.isDebugEnabled()) {
        LOG.debug("getFileStatus returning 'directory' for key '" + key + "' as it has contents");
      }
      return newDirectory(absolutePath);
    }

    if (LOG.isDebugEnabled()) {
      LOG.debug("getFileStatus could not find key '" + key + "'");
    }
    throw new FileNotFoundException("No such file or directory '" + absolutePath + "'");
  }