コード例 #1
0
  @Override
  public Dataset create(String name, DatasetDescriptor descriptor) {

    Preconditions.checkArgument(name != null, "Name can not be null");
    Preconditions.checkArgument(descriptor != null, "Descriptor can not be null");

    Schema schema = descriptor.getSchema();
    Path datasetPath = pathForDataset(name);

    try {
      if (fileSystem.exists(datasetPath)) {
        throw new DatasetRepositoryException("Attempt to create an existing dataset:" + name);
      }
    } catch (IOException e) {
      throw new DatasetRepositoryException(
          "Internal error while determining if dataset path already exists:" + datasetPath, e);
    }

    logger.debug(
        "Creating dataset:{} schema:{} datasetPath:{}", new Object[] {name, schema, datasetPath});

    try {
      if (!fileSystem.mkdirs(datasetPath)) {
        throw new DatasetRepositoryException("Failed to make dataset path:" + datasetPath);
      }
    } catch (IOException e) {
      throw new DatasetRepositoryException(
          "Internal failure while creating dataset path:" + datasetPath, e);
    }

    metadataProvider.save(name, descriptor);

    return new FileSystemDataset.Builder()
        .name(name)
        .fileSystem(fileSystem)
        .descriptor(descriptor)
        .directory(pathForDataset(name))
        .partitionKey(descriptor.isPartitioned() ? Accessor.getDefault().newPartitionKey() : null)
        .get();
  }