Java Path.isRoot方法代碼示例

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
private void deleteUnnecessaryFakeDirectories(Path f) throws IOException {
  while (true) {
    try {
      String key = pathToKey(f);
      if (key.isEmpty()) {
        break;
      }

      S3AFileStatus status = getFileStatus(f);

      if (status.isDirectory() && status.isEmptyDirectory()) {
        if (LOG.isDebugEnabled()) {
          LOG.debug("Deleting fake directory " + key + "/");
        }
        s3.deleteObject(bucket, key + "/");
        statistics.incrementWriteOps(1);
      }
    } catch (FileNotFoundException | AmazonServiceException e) {
    }

    if (f.isRoot()) {
      break;
    }

    f = f.getParent();
  }
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
@Override
public FSDataInputStream open(Path f, int bufferSize) throws IOException {
  Path absolutePath = toAbsolutePath(f);
  checkPath(absolutePath);

  // Handle root
  if (absolutePath.isRoot()) {
    throw new AccessControlException("Cannot open " + f);
  }

  try {
    RemotePath remotePath = getRemotePath(absolutePath);

    FileSystem delegate = getDelegateFileSystem(remotePath.address);
    return delegate.open(remotePath.path, bufferSize);
  } catch (IllegalArgumentException e) {
    throw (FileNotFoundException) (new FileNotFoundException("No file " + absolutePath).initCause(e));
  }
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
@Override
public boolean delete(Path f, boolean recursive) throws IOException {
  Path absolutePath = toAbsolutePath(f);
  checkPath(absolutePath);

  // Handle root
  if (absolutePath.isRoot()) {
    throw new AccessControlException("Cannot delete " + f);
  }

  if (!isRemoteFile(f)) {
    // In our remote view, there might be a directory, so delete task should handle this case
    return new DeleteTask(absolutePath, recursive).get();
  }

  try {
    RemotePath remotePath = getRemotePath(absolutePath);

    FileSystem delegate = getDelegateFileSystem(remotePath.address);
    return delegate.delete(remotePath.path, recursive);
  } catch (IllegalArgumentException e) {
    throw (FileNotFoundException) (new FileNotFoundException("No file " + absolutePath).initCause(e));
  }
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
@Override
public boolean mkdirs(Path f, FsPermission permission) throws IOException {
  Path absolutePath = toAbsolutePath(f);
  checkPath(absolutePath);

  // Handle root
  if (absolutePath.isRoot()) {
    // Path always exists
    return true;
  }

  if (isRemoteFile(absolutePath)) {
    // Attemping to create a subdirectory for a file
    throw new IOException("Cannot create a directory under file " + f);
  }

  return new MkdirsTask(absolutePath, permission).get();
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
/**
 * Create the output folder and optionally set ownership.
 */
private void createOutputPath(final Path path) throws IOException {
  if (filesUser == null && filesGroup == null) {
    outputFs.mkdirs(path);
  } else {
    Path parent = path.getParent();
    if (!outputFs.exists(parent) && !parent.isRoot()) {
      createOutputPath(parent);
    }
    outputFs.mkdirs(path);
    if (filesUser != null || filesGroup != null) {
      // override the owner when non-null user/group is specified
      outputFs.setOwner(path, filesUser, filesGroup);
    }
    if (filesMode > 0) {
      outputFs.setPermission(path, new FsPermission(filesMode));
    }
  }
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
/**
 * Block any operation on the root path. This is a safety check
 * @param path path in the filesystem
 * @param allowRootOperation can the root directory be manipulated?
 * @throws IOException if the operation was rejected
 */
public static void rejectRootOperation(Path path,
    boolean allowRootOperation) throws IOException {
  if (path.isRoot() && !allowRootOperation) {
    throw new IOException("Root directory operation rejected: " + path);
  }
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
@Override
public FileStatus getFileStatus(Path f) throws IOException {
  if (f.isRoot()) {
    return new FileStatus(0, true, 0, 0, 0, f);
  }
  return null;
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
/**
 * Create a new file. Three possibilities:
 *  - This is a data node and you're trying to create a unqualified file => write locally.
 *  - This is a client node and you're trying to create unqualified file => pick a random data node and write there.
 *  - The path you provide is qualified => write to that node.
 */
@Override
public FSDataOutputStream create(Path f, FsPermission permission, boolean overwrite, int bufferSize,
    short replication, long blockSize, Progressable progress) throws IOException {
  final Path absolutePath = toAbsolutePath(f);
  checkPath(absolutePath);

  // Handle root
  if (absolutePath.isRoot()) {
    throw new AccessControlException("Cannot create " + f);
  }

  if(!isRemoteFile(f)){
    if (isDirectory(absolutePath)) {
      throw new FileAlreadyExistsException("Directory already exists: " + f);
    }

    // Only canonicalized path/remote files are allowed
    throw new IOException("Cannot create non-canonical path " + f);
  }

  try {
    RemotePath remotePath = getRemotePath(absolutePath);
    return getDelegateFileSystem(remotePath.address).create(remotePath.path, permission, overwrite, bufferSize, replication, blockSize, progress);
  } catch (IllegalArgumentException e) {
    throw (IOException) (new IOException("Cannot create file " + absolutePath).initCause(e));
  }
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
/**
 * Create a new file. Three possibilities:
 *  - This is a data node and you're trying to append a unqualified file => write locally.
 *  - The path you provide is qualified => write to that node.
 *
 *  If this is a client node and you try to write to a unqualified file, we'll throw
 */
@Override
public FSDataOutputStream append(Path f, int bufferSize, Progressable progress) throws IOException {
  Path absolutePath = toAbsolutePath(f);
  checkPath(absolutePath);

  // Handle root
  if (absolutePath.isRoot()) {
    throw new AccessControlException("Cannot open " + f);
  }

  if(!isRemoteFile(f)){
    if (isDirectory(absolutePath)) {
      throw new FileAlreadyExistsException("Directory already exists: " + f);
    }

    // Only fully canonicalized/remote files are allowed
    throw new IOException("Cannot create non-canonical path " + f);
  }

  try {
    RemotePath remotePath = getRemotePath(absolutePath);

    FileSystem delegate = getDelegateFileSystem(remotePath.address);
    return delegate.append(remotePath.path, bufferSize, progress);
  } catch (IllegalArgumentException e) {
    throw (FileNotFoundException) (new FileNotFoundException("No file " + absolutePath).initCause(e));
  }
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
private void addParentDirectoriesRecursively(Path path) throws IOException {
    if (!path.isRoot()) {
        Path parent = path.getParent();
        IndexDirectory newEntry = new IndexDirectory(fs.getFileStatus(parent));
        newEntry.addChild(path.getName());
        index.addEntry(newEntry);
        addParentDirectoriesRecursively(parent);
    }
}